2023/06/23 更新

写真a

ゴミ タカシ
五味 高志
GOMI Takashi
所属
大学院生命農学研究科 森林・環境資源科学専攻 森林・環境資源科学 教授
大学院担当
大学院生命農学研究科
学部担当
農学部 生物環境科学科
職名
教授

学位 3

  1. Ph.D. ( 2002年5月   ブリティシュコロンビア大学 ) 

  2. 修士 ( 1994年3月   北海道大学 ) 

  3. 学士 ( 1992年3月   北海道大学 ) 

研究キーワード 1

  1. 流域水文学、砂防学、流域生態系管理学

研究分野 3

  1. 環境・農学 / 環境農学  / 流域資源管理学

  2. 環境・農学 / 環境動態解析  / 森林水文学

  3. 環境・農学 / 環境動態解析  / 砂防学

現在の研究課題とSDGs 2

  1. 流域の土砂や流木動態の評価と災害対策

  2. 森林管理と森林水循環の評価

経歴 5

  1. 東京農工大学   農学研究院国際環境農学部門   教授

    2016年10月 - 2022年9月

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    国名:日本国

  2. 東京農工大学   農学研究院国際環境農学部門   准教授

    2009年9月 - 2016年9月

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    国名:日本国

  3. 東京農工大学   農学研究院国際環境農学部門   講師

    2007年10月 - 2009年8月

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    国名:日本国

  4. 京都大学   防災研究所地盤災害研究部門   研究員   JST/CREST研究員

    2004年4月 - 2007年9月

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    国名:日本国

  5. ブリティシュコロンビア大学   地理学部   研究員

    2002年6月 - 2004年3月

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    国名:カナダ

学歴 3

  1. ブリティシュ・コロンビア大学   森林資源管理学科

    1998年1月 - 2002年5月

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    国名: カナダ

  2. 北海道大学   大学院農学研究科   林学専攻

    1992年4月 - 1994年3月

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    国名: 日本国

  3. 北海道大学   農学部   林学科

    1988年4月 - 1992年3月

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    国名: 日本国

所属学協会 5

  1. 水文・水資源学会

    2010年4月 - 現在

  2. 応用生態工学会

    2010年4月 - 現在

  3. 日本森林学会

    2004年4月 - 現在

  4. 公益法人 砂防学会

    2004年4月 - 現在

  5. American Geophysical Union

    2000年8月 - 現在

委員歴 13

  1. 林野庁   令和5年度水源林造成事業評価技術検討会  

    2023年4月 - 現在   

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    団体区分:政府

  2. 神奈川県   令和4年度農林水産技術会議研究課題設定部会 委員  

    2023年1月 - 2023年2月   

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    団体区分:自治体

  3. 経済産業省   環境審査顧問会  

    2022年10月 - 現在   

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    団体区分:政府

  4. 公益社団法人森林・自然環境技術教育研究センター   森林グリーンインフラ整備検証委員会  

    2022年7月 - 2024年7月   

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    団体区分:その他

  5. 経済産業省   再生可能エネルギー発電設備の適正な導入及び管理のあり方に関する検討会  

    2022年4月 - 現在   

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    団体区分:政府

  6. 神奈川県   水源環境保全・再生かながわ県民会議委員  

    2022年4月 - 現在   

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    団体区分:自治体

  7. 林野庁   令和4年度水源林造成事業評価技術検討会  

    2022年4月 - 2023年3月   

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    団体区分:政府

  8. 日本森林技術協会   令和4年度山地保全調査(森林の水源涵養機能の評価・発信に関する調査)委員会  

    2022年3月 - 2023年3月   

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    団体区分:その他

  9. 林野庁   太陽光発電に係る林地開発許可基準に関する検討会  

    2022年1月 - 2022年6月   

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    団体区分:政府

  10. 環境省   環境影響審査助言委員  

    2021年4月 - 現在   

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    団体区分:政府

  11. 日本森林技術協会   令和3年度山地保全調査(森林の水源涵養機能の評価・発信に関する調査)委員会  

    2021年3月 - 2022年3月   

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    団体区分:その他

  12. 神奈川県   神奈川県水源林確保整備専門委員  

    2020年4月 - 現在   

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    団体区分:自治体

  13. 日本森林技術協会   令和2年度山地保全調査(森林の水源涵養機能の評価・発信に関する調査)委員会  

    2020年4月 - 2021年3月   

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    団体区分:その他

▼全件表示

受賞 2

  1. 論文賞

    2020年9月   水文・水資源学会   山地流域の水・土砂流出における空間スケールの影響(1)〜(3)

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    受賞区分:国内学会・会議・シンポジウム等の賞 

  2. 森林学会賞

    2015年3月   日本森林学会   森林施業による水流出プロセス・河川環境変化の評価とそのモデル化

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    受賞区分:国内学会・会議・シンポジウム等の賞 

 

論文 92

  1. The Mobility of Landslides in Pumice: Insights from a Flume Experiment 査読有り 国際共著

    Rozaqqa Noviandi,Takashi Gomi,Hefryan S. Kharismalatri,Roy C. Sidle,Rasis P. Ritonga, Katsushige Shiraki

    Water   14 巻 ( 19 ) 頁: 3083   2022年9月

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    担当区分:責任著者   記述言語:英語  

    DOI: doi.org/10.3390/w14193083

  2. Contrasting Patterns in the Decrease of Spatial Variability With Increasing Catchment Area Between Stream Discharge and Water Chemistry 査読有り 国際誌

    Egusa Tomohiro, Kumagai Tomo'omi, Oda Tomoki, Gomi Takashi, Ohte Nobuhito

    WATER RESOURCES RESEARCH   55 巻 ( 8 ) 頁: 7419 - 7435   2019年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2018WR024302

    Web of Science

  3. Determinant factors of sediment graphs and rating loops in a reforested watershed 査読有り 国際共著

    S. H. R. Sadeghi, T. Mizuyama, S. Miyata, T. Gomi, K. Kosugi, T. Fukushima, S. Mizugaki, Y. Onda

    JOURNAL OF HYDROLOGY   356 巻 ( 3-4 ) 頁: 271 - 282   2008年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Sediment graphs and hydrographs were analyzed in a small, high-gradient reforested watershed in Mie Prefecture, Japan, which was instrumented to measure discharge and sediment transport. The study was conducted to recognize determinant factors on sediment graphs and hydrographs relationships, and corresponding rating loops using eight storm events that occurred in 2004. A cause-and-effect analytical approach was employed in the investigation of factors controlling individual hydrological events. The results showed that in a single event, the sediment peak preceded the peak discharge, following a clockwise hysteretic loop. The rating loops exhibited hysteresis with a greater suspended sediment concentration for a given discharge occurring on the rising limb rather than on the failing limb. Furthermore, the reduction in suspended sediment concentrations in a sequence of events and the falling limbs could mainly be associated with sediment exhaustion and contributions of throughfall and throughflow. We concluded that a combination of sediment availability, rainfall characteristics, soil water repellency, and contribution of different flow components control the variations in event-wise sediment graphs and rating loops in the study area. Understanding the relationship between controlling factors and sediment yield dynamics in the study area should greatly improve our understanding of sediment transport mechanisms and predictions in reforested watersheds, which should ultimately lead to better management of forest ecosystems. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jhydrol.2008.04.005

    Web of Science

  4. Ecological resilience of physical plant-soil feedback to chronic deer herbivory: Slow, partial, but functional recovery.

    Ohira M, Gomi T, Iwai A, Hiraoka M, Uchiyama Y

    Ecological Applications   32 巻 ( 7 ) 頁: e2656   2022年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/eap.2656

    PubMed

  5. 東京都新宿南口から皇居までの道路周辺環境における 放射性セシウムの分布 ~2020 年の調査~

    渡邉 泉, 関澤 京夏, 大矢 悠幾, 尾崎 宏和, 大地 まどか, 五味 高志

    復興農学会誌   2 巻 ( 2 ) 頁: 28 - 42   2022年7月

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    記述言語:日本語   出版者・発行元:復興農学会  

    <p>2020 年5 月に東京都内の新宿駅南口から皇居・半蔵門まで,おもに国道20 号線の沿道から道路脇粉塵,蘚苔類(おもに蘚類)およびキク科のオオアレチノギクを採取し,放射性セシウム分析をおこなうことで,都市沿道環境における放射性セシウムの分布解明を試みた。その結果,調査時点でこの地域の放射性セシウムレベルは道路脇粉塵で最高3,020 Bq kg <sup>-1</sup>乾重あたりの<sup>137</sup>Cs濃度がみられ,原発事故から10 年近くが経過した都内にホットスポットとなりうる場所が形成されている可能性が示唆された。同地点で採取した数種の試料では,蘚類の根圏土壌>道路脇粉塵>蘚類>オオアレチノギクの順で高かった。また試料によって濃度のばらつきが異なり,道路脇粉塵>オオアレチノギク>蘚類の根圏土壌>蘚類の順でばらつきが大きくなった。これらのことから蘚類とその根圏土壌は放射性セシウムを高濃度かつ安定的に蓄積すると結論され,モニタリングに有効であることが示された。2020年の調査地の中では新宿御苑前で特異な高濃度がみられ,他には新宿三丁目,四ツ谷駅周辺および半蔵門前で比較的高レベルの放射性セシウムが検出された。それらの地点は調査地の中で比較的道幅が狭く,局地的な地理条件が放射性セシウムの蓄積に関与している可能性がうかがえた。</p>

    DOI: 10.57341/jras.2.2_28

    CiNii Research

  6. Understory biomass measurement in a dense plantation forest based on drone-SfM data by a manual low-flying drone under the canopy. 査読有り

    Zhang Y, Onda Y, Kato H, Feng B, Gomi T

    Journal of Environmental Management   312 巻   頁: 114862   2022年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jenvman.2022.114862

    PubMed

  7. Evaluating changes in catchment‐scale evapotranspiration after 50% strip‐thinning in a headwater catchment 査読有り

    Chen‐Wei Chiu, Takashi Gomi, Marino Hiraoka, Katsushige Shiraki, Yuichi Onda, Bui Xian Dung

    Hydrological Processes     2022年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1002/hyp.14611

  8. Seasonal variations of Cs-137 concentration in freshwater charr through uptake and metabolism in 1-2 years after the Fukushima accident

    Okada Kengo, Sakai Masaru, Gomi Takashi, Iwamoto Aimu, Negishi Junjiro N., Nunokawa Masanori

    ECOLOGICAL RESEARCH   36 巻 ( 6 ) 頁: 935 - 946   2021年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1111/1440-1703.12266

    Web of Science

  9. Long-term impacts of forest disturbances: Comparing cumulative effects of clearcut logging versus landslide on stream conditions and abundance of a headwater stonefly Scopura montana

    Ohira Mitsuru, Watanabe Yu'usuke, Gomi Takashi, Sakai Masaru

    FRESHWATER BIOLOGY   66 巻 ( 10 ) 頁: 2004 - 2015   2021年10月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1111/fwb.13811

    Web of Science

    その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/fwb.13811

  10. 山地流域の水・土砂流出における空間スケールの影響(4):水・土砂流出予測精度向上に向けた提案

    内田 太郎, 浅野 友子, 平岡 真合乃, 横尾 善之, 五味 高志, 水垣 滋, 丹羽 諭, 勝山 正則

    水文・水資源学会誌   34 巻 ( 3 ) 頁: 192 - 204   2021年5月

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    記述言語:日本語   出版者・発行元:水文・水資源学会  

    <p> 本稿では,山地流域を対象とした水や土砂の流出現象に関する数値予測モデルの予測精度向上のために重要であると考えられる,現象を規定するプロセス(支配プロセス)の抽出と,そのプロセスを規定する場や外力の条件(規定要因)の把握手法について考察した.流域内の多地点での水・土砂流出量の観測に基づき明らかとなる流域面積と水・土砂流出量の関係が,支配プロセスやその規定要因の空間分布様式によって類型化できることを示した.このことから,流域内の多地点で流域面積と水・土砂流出量の関係を把握することが,水・土砂流出現象の支配プロセスやその規定要因の抽出につながる可能性を示した.その上で,流出量の空間分布の観測の成果を数値予測モデルに反映させるための課題やアプローチについて検討し,①水・土砂流出特性の空間分布情報を把握するための面的調査の重要性,②場の条件に関する空間分布情報のカタログ化の重要性,③地形のみによって表現可能なプロセスと表現できないプロセスの分類,④地形のみによって表現できないプロセスのモデル化手法について議論した. </p>

    DOI: 10.3178/jjshwr.34.192

    CiNii Research

  11. A Review of SWAT Model Application in Africa

    Akoko George, Le Tu Hoang, Gomi Takashi, Kato Tasuku

    WATER   13 巻 ( 9 )   2021年5月

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  12. Topographic features and stratified soil characteristics of a hillslope with fissures formed by the 2016 Kumamoto earthquake

    Arata Yohei, Gomi Takashi, Sidle Roy C.

    GEODERMA   376 巻   2020年10月

  13. Characteristics of landslides in forests and grasslands triggered by the 2016 Kumamoto earthquake

    Koyanagi Kenta, Gomi Takashi, Sidle Roy C.

    EARTH SURFACE PROCESSES AND LANDFORMS   45 巻 ( 4 ) 頁: 893 - 904   2020年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/esp.4781

    Web of Science

  14. Assessing spatially distributed infiltration capacity to evaluate storm runoff in forested catchments: Implications for hydrological connectivity 査読有り

    Miyata Shusuke, Gomi Takashi, Sidle Roy C., Hiraoka Marino, Onda Yuichi, Yamamoto Kazukiyo, Nonoda Toshiro

    SCIENCE OF THE TOTAL ENVIRONMENT   669 巻   頁: 148 - 159   2019年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We assessed spatial distribution of infiltration capacity under forest canopies to simulate runoff processes in a steep small catchment in Japan. High resolution LiDAR data were used to assess light availability to understory vegetation, which in turn was converted into an understory vegetation cover ratio. Spatially distributed infiltration capacities based on data from field rainfall-runoff experiments were incorporated into the TopoTube model using a relationship between infiltration capacity and vegetation cover. Effects of spatial distribution of infiltration capacity and its influence on hydrological connectivity and runoff processes were examined based on numerical simulations in the following three infiltration scenarios for seven natural storms: (1) spatially distributed infiltration capacity; (2) uniform infiltration capacity using the weighted mean of the spatial distribution in the drainage basin; and (3) uniform infiltration capacity using the arithmetic mean of field measurements. Although saturated subsurface flow dominated storm runoff in all simulations, Hortonian and saturated overland flow were significant for storm runoff response in smaller catchments (headwate

    DOI: 10.1016/j.scitotenv.2019.02.453

    Web of Science

    PubMed

  15. 生態系ネットワークのインターフェースとしての礫河原

    五味 高志, 大平 充

    日本緑化工学会誌   44 巻 ( 3 ) 頁: 489 - 493   2019年2月

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    記述言語:日本語   出版者・発行元:日本緑化工学会  

    <p>礫河原の再生には,植物生態学,動物生態学,河川生態学,地形学,水文学,土木工学,人文社会学などのさまざまな学術領域が関連している。本報告では,礫河原再生に関してとりあつかう対象の測定間隔や解析範囲のほか,対象とする現象が影響する空間的な広がりやその発生頻度や時系列変化など,時間的・空間的スケールの整理を行った。とくに,礫河原を生態系ネットワークのインターフェースと位置づけ,礫河原が介在する諸現象の関連を検討した。既往の知見をスケールの枠組みで取りまとめることが,礫河原再生への統合的な枠組みや,段階的な目標設定を行える枠組み構築を進める一助となると考えられた。</p>

    DOI: 10.7211/jjsrt.44.489

    CiNii Research

  16. これまでの森林水文観測と今後

    五味 高志

    水文・水資源学会誌   31 巻 ( 6 ) 頁: 560 - 567   2018年11月

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    記述言語:日本語   出版者・発行元:水文・水資源学会  

    DOI: 10.3178/jjshwr.31.560

    CiNii Research

  17. Discovery of zero-order basins as an important link for progress in hydrogeomorphology

    Sidle Roy C., Gomi Takashi, Tsukamoto Yoshinori

    HYDROLOGICAL PROCESSES   32 巻 ( 19 ) 頁: 3059 - 3065   2018年9月

  18. 山地流域の水・土砂流出における空間スケールの影響(1):流域面積に対する水・土砂流出量の応答に関する観測例

    浅野 友子, 内田 太郎, 五味 高志, 水垣 滋, 平岡 真合乃, 勝山 正則, 丹羽 諭, 横尾 善之

    水文・水資源学会誌   31 巻 ( 4 ) 頁: 219 - 231   2018年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:水文・水資源学会  

    <p> 流域の水・土砂動態の観測結果を実態把握に活用し,予測精度を高めるためには,水・土砂流出における空間スケールの影響について理解することが重要である.本総説ではこれまでに得られてきた流域面積と平水時や出水時,それらを包含する長期的な水・土砂流出現象の関係についての調査・観測結果の収集と分析から,空間スケール依存性と空間不均一性に焦点を当て,空間スケールと水・土砂流出現象の関係を明らかにすることを試みた.その結果,流域面積に対して増加や減少などの一般的な関係が見いだされる物理量と,観測事例数が限られているなどの理由によって現時点では関係が不明瞭である物理量があった.また,これまでの調査・観測事例は空間スケール依存性か空間不均一性のどちらかに着目している場合が多かった.ピーク時の比流量など空間スケール依存性が着目されてきた物理量は,流出現象を支配する機構が空間スケールによって変化すると考えられる.一方,基底流時比流量など空間不均一性が調べられてきた物理量は,空間スケールによって流出現象を支配する機構が大きく変化しないため,相対的に場の条件の違いが流出に与える影響が大きかったと考えられる.</p>

    DOI: 10.3178/jjshwr.31.219

    CiNii Research

  19. 山地流域の水・土砂流出における空間スケールの影響(3):数値解析モデル上の取り扱い事例

    横尾 善之, 丹羽 諭, 内田 太郎, 平岡 真合乃, 勝山 正則, 五味 高志, 水垣 滋, 浅野 友子

    水文・水資源学会誌   31 巻 ( 4 ) 頁: 245 - 261   2018年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:水文・水資源学会  

    <p> 本稿は,山地流域の水・土砂流出現象の数値解析モデルにおける空間スケールの影響の取り扱い方に関する既往研究を調べた.まず,代表的な数値解析モデルを利用した研究における,(1)最小の空間スケールとその決定方法,(2)入力データとして利用する空間分布情報,(3)支配方程式の空間スケール依存性の3点を整理した.その結果,(1)の最小空間スケールは,利用する標高データの最小の空間スケールに依存すること,(2)の利用する空間分布情報は標高・土地利用・植生データが多く,その他は実測に基づくデータではないこと,(3)の支配方程式は対象とする斜面や河道などの「場」に依存し,空間スケールに応じて明示的に支配方程式が変化するモデルはなかった.次に,空間スケールの影響の取り扱い方自体を検討した既往研究を調べた.その結果,水流出モデルに関しては集中化できる面積(基準面積)や入力する空間分布情報の相対的重要性に関する知見が集積されつつあるが,土砂流出モデルについては同様の研究報告はなかった.以上を踏まえ,水・土砂流出モデリングにおける空間スケールの取り扱い方の今後の在り方の一つを提示する.</p>

    DOI: 10.3178/jjshwr.31.245

    CiNii Research

  20. 山地流域の水・土砂流出における空間スケールの影響(2):集中的な観測が行われた流域の事例

    浅野 友子, 内田 太郎, 勝山 正則, 平岡 真合乃, 水垣 滋, 五味 高志, 丹羽 諭, 横尾 善之

    水文・水資源学会誌   31 巻 ( 4 ) 頁: 232 - 244   2018年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:水文・水資源学会  

    <p> 本研究では,水・土砂流出過程に関する詳細な観測が行われてきた滋賀県不動寺試験流域と桐生水文試験地,神奈川県大洞沢試験流域,北海道鵡川・沙流川流域における研究を精査し,水・土砂流出量と流域面積の関係に関する新たな解析を加え,空間不均一性,空間スケール依存性が生じるプロセスについて考察した.水流出に関しては,岩盤経由の地下水の流出と表土層のみを経由した水の流出の寄与率の違いが源頭部の小流域の比流量のばらつきの要因であると考えられた.岩盤経由の地下水の一部は地表面の流域界を跨いで流出するが,流域面積が大きくなるに伴い相対的に流域界を越える水流の影響が小さくなり,岩盤経由の地下水寄与率が異なる特徴を有する流域の影響が混在することで平準化され,水流出量の空間不均一性は集水面積が大きくなるに伴い小さくなると考えられた.また,土砂流出は流域面積が大きくなるに従い異なる特徴を有する流域の影響が平準化されるのみならず,土砂貯留空間の増大および流域全体に占める生産域の減少により比流出土砂量の減少が生じる一方,過去の土砂生産履歴の影響や土砂生産源の偏在による比流出土砂量の増加が生じる場合もあることが明らかになった.</p>

    DOI: 10.3178/jjshwr.31.232

    CiNii Research

  21. Effect of canopy openness and meteorological factors on spatial variability of throughfall isotopic composition in a Japanese cypress plantation

    Sun Xinchao, Onda Yuichi, Hirata Akiko, Kato Hiroaki, Gomi Takashi, Liu Xueyan

    HYDROLOGICAL PROCESSES   32 巻 ( 8 ) 頁: 1038 - 1049   2018年4月

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    記述言語:英語  

    DOI: 10.1002/hyp.11475

    Web of Science

    Scopus

  22. Cesium-137 contamination of river food webs in a gradient of initial fallout deposition in Fukushima, Japan

    Negishi J. N., Sakai M., Okada K., Iwamoto A., Gomi T., Miura K., Nunokawa M., Ohhira M.

    LANDSCAPE AND ECOLOGICAL ENGINEERING   14 巻 ( 1 ) 頁: 55 - 66   2018年1月

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  23. Evaluating Cs-137 detachment from coniferous needle litter in a headwater stream: a litter bag field experiment

    Gomi Takashi, Sakai Masaru, Haque Md. Enamul, Hosoda Kosuke, Toda Hiroto

    LANDSCAPE AND ECOLOGICAL ENGINEERING   14 巻 ( 1 ) 頁: 17 - 27   2018年1月

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  24. Tracing radioactive contamination of river basins for the development of effective mitigation measures

    Yoshimura Chihiro, Gomi Takashi, Tanida Kazumi

    LANDSCAPE AND ECOLOGICAL ENGINEERING   14 巻 ( 1 ) 頁: 1 - 2   2018年1月

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  25. Hydrogeomorphic processes and scaling issues in the continuum from soil pedons to catchments 査読有り

    Roy C. Sidle, Takashi Gomi, Juan Carlos Loaiza Usuga, Ben Jarihani

    EARTH-SCIENCE REVIEWS   175 巻   頁: 75 - 96   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Understanding integrated hydrological phenomena in catchments is difficult because of the fragmented nature of soil physical and hydrological data, given these are typically derived from pedons or small plots. Runoff plot and lysimeter or pedon-scale studies do not capture the complexity of surface and subsurface flowpaths in hillslopes. Because pedon/plot scale results are not easily transferable to hillslope and catchment scales, theoretical and empirical approaches to quantify hydrological dynamics based on such 'point-scale' data tend to over- or underestimate parameters and fluxes. Unit area sediment flux measured during storms typically (but not always) decreases from small plots to hillslopes owing to sediment deposition and re-infiltration of overland flow in localized areas. At broader scales, re-entrainment of previously stored sediment complicates this generalization, as may the development of rill and gully systems, facilitated by overland flow concentration. Quantifying mass wasting and sediment interactions in channels presents different temporal and spatial challenges, and must be assessed at the catchment scale. Process-based scaling requires an over-arching integration of different hydro geomorphic concepts and approaches. Nested catchment studies, where processes are monitored at different scales, represent an opportunity to elucidate the diverse spatial and temporal patterns of water and sediment behaviour. The spatial scale dependence inherent in many pedology and catchment hydrology studies can be overcome by incorporating hydrogeomorphic, pedological, and connectivity concepts that demonstrate how soil hydraulic parameters, geomorphic controls, and water/sediment routing change from plot to hillslope to catchment scales. The resulting self-organization generates spatial and temporal dependencies and provides a paradigm to better understand, model, and assess management effects on water and sediment fluxes and pathways in the continuum from plots to catchments.

    DOI: 10.1016/j.earscirev.2017.10.010

    Web of Science

  26. The continuum of chronic to episodic natural hazards: Implications and strategies for community and landscape planning

    Sidle Roy C., Gallina John, Gomi Takashi

    LANDSCAPE AND URBAN PLANNING   167 巻   頁: 189 - 197   2017年11月

  27. Estimation of throughfall with changing stand structures for Japanese cypress and cedar plantations

    Sun Xinchao, Onda Yuichi, Kato Hiroaki, Gomi Takashi, Liu Xueyan

    FOREST ECOLOGY AND MANAGEMENT   402 巻   頁: 145 - 156   2017年10月

  28. Change in evapotranspiration partitioning after thinning in a Japanese cypress plantation 査読有り

    Xinchao Sun, Yuichi Onda, Kyoichi Otsuki, Hiroaki Kato, Takashi Gomi, Xueyan Liu

    TREES-STRUCTURE AND FUNCTION   31 巻 ( 5 ) 頁: 1411 - 1421   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER HEIDELBERG  

    Thinning resulted in evapotranspiration decrease and caused the relative contributions of each component to evapotranspiration to become very close.
    To increase the understanding of forest management to control water cycles, we examined the effect of 50% strip thinning on evapotranspiration (ET) and its partitioning into canopy interception (E (i)), tree transpiration (E (t)), and forest floor evaporation (E (f)) in a Japanese cypress (Chamaecyparis obtusa Endl.) plantation. Intensive measurements were employed to monitor each component of ET during the pre- and post-thinning periods. The results showed the annual E (t) was the dominant component of ET followed by E (i), whereas E (f) was the smallest component in both periods. Thinning has significant impact on the process of ET partitioning. In such that it decreased from 42.3 to 33.7% in E (i)/ET and from 45.0 to 34.9% in E (t)/ET, and increased from 12.7 to 31.4% in E (f)/ET on an annual scale. The relative contributions of each ET component to the whole ET became more or less the same after thinning. Additionally, the monthly E (i)/P (g) had relative stable values in both pre- and post-thinning periods, contributing significantly to the ET/P (g) during heavy rainfall conditions. After thinning, ET decreased by 21.4% from 629.3 to 494.8 mm during the growing season and by 20.4% from 979.8 to 780.1 mm at the annual scale, demonstrating that thinning results in an increase in water availability in the forested watershed. This study can improve the understanding of forest water budget in response to thinning and aid in development of appropriate forest management practices accordingly.

    DOI: 10.1007/s00468-017-1555-1

    Web of Science

  29. Effect of tree thinning and skidding trails on hydrological connectivity in two Japanese forest catchments 査読有り

    Manuel Lopez-Vicente, Xinchao Sun, Yuichi Onda, Hiroaki Kato, Takashi Gomi, Marino Hiraoka

    GEOMORPHOLOGY   292 巻   頁: 104 - 114   2017年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Land use composition and patterns influence the hydrological response in mountainous and forest catchments. In plantation forest, management operations (FMO) modify the spatial and temporal dynamics of overland flow processes. However, we found a gap in the literature focussed on modelling hydrological connectivity (HC) in plantation forest under different FMO. In this study, we simulated HC in two steep paired forest subcatchments (K2 and K3, 33.2 ha), composed of Japanese cypress (Chamaecyparis obtusa Endl.) and Japanese cedar (Cryptomeria japonica D. Don) plantations (59% of the total area) against a tree thinning intensity of 50% at different time. Additionally, construction of new skidding trails and vegetation recovery was simulated on five thinning-based scenarios that covered a 40-month test period (July 2010 - October 2013). As a future scenario, six check-dams located in the main streams were proposed to reduce sediment and radionuclide delivery. An updated version of Borselli's index of runoff and sediment connectivity was run, using the D-infinity flow accumulation algorithm and exploiting three 0.5-m resolution digital elevation models. On the basis of the pre-FMO scenario, HC increased at catchment scale owing to tree thinning and the new skidding trails. This change was more noticeable within the area affected by the FMO, where HC increased by 11.4% and 10.5% in the cypress and cedar plantations in K2 respectively and by 8.8% in the cedar plantation in K3. At hillslope plot and stream scales, the evolution in the values of HC was less evident, except the increment (by 5.4%) observed in the streams at K2 after the FMO. Progressive vegetation recovery after the FMO triggered a slight reduction of connectivity in all compartments of both subcatchments. Forest roads and especially skidding trails presented the highest values of HC, appearing as the most efficient features connecting the different vegetation patches with the stream network. The spatial and temporal evolution of HC over the five past scenarios correlated well with the observed changes in runoff yield, as well as with the available values of rainfall interception and throughfall before, during, and after the FMO. The simulation of the proposed scenario recommends the construction of check-dams as effective landscape features to somewhat reduce HC and thus to decrease the sediment and radionuclide delivery rates from the two subcatchments.

    DOI: 10.1016/j.geomorph.2017.05.006

    Web of Science

  30. Developing a food web-based transfer factor of radiocesium for fish, whitespotted char (Salvelinus leucomaenis) in headwater streams 査読有り

    Md. Enamul Haque, Takashi Gomi, Masaru Sakai, Junjiro N. Negishi

    JOURNAL OF ENVIRONMENTAL RADIOACTIVITY   172 巻   頁: 191 - 200   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    We developed a food web-based transfer factor (TFweb) to study contaminant movements from multiple prey items to a predator based on the dietary contributions of prey items with their respective contamination levels. TFweb was used to evaluate the transfer of Cs-137 into whitespotted char (Salvelinus leucomaenis) from the trophic structure of a stream riparian ecosystem in headwater streams draining a Japanese cedar forest. We also examined the applicability of this method by comparing sites with different contamination levels but similar surrounding environments in Fukushima and Gunma. All samples were collected from August 2012 to May 2013. The dietary contributions from both aquatic and terrestrial prey items to whitespotted char were analyzed using stable carbon and nitrogen isotope ratios. Cs-137 activity concentrations in char ranged from 704 to 6082 Bq kg(-1)-dry in Fukushima and from 193 to 618 Bq kg(-1)-dry in Gunma. Dominant prey taxa such as mayflies (Ephemera japonica), spider crickets (Rhaphidosphoridae gen. spp.), and freshwater crabs (Geothelphusa dehaani), each of them accounted for 3-12% of the fish diet, based on lower and upper estimates, respectively. TFweb ranged from 1.12 to 3.79 in Fukushima and from 1.30 to 4.30 in Gunma, which suggested bioaccumulation from prey items to predator. Widely used ecological parameters TFs by media-char and ITF by single prey -char showed high variability with both dilution and accumulation. TFweb is applicable for Cs-137 transfer in predator-prey systems with complex food web structures of stream-riparian ecosystems. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jenvrad.2017.02.020

    Web of Science

  31. Field estimation of interception in a broadleaf forest under multi-layered structure conditions 査読有り

    Yutaka Abe, Takashi Gomi, Norihisa Nakamura, Noriko Kagawa

    Hydrological Research Letters   11 巻 ( 4 ) 頁: 181 - 186   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Hydrology and Water Resources  

    We performed a field experiment on throughfall, stemflow, and bamboo culm flow to estimate interception in a deciduous broadleaf forest with different stand structures by separately removing the overstory and understory vegetation. The study area is occupied by oak (Quercus serrata) and chestnut (Castanea crenata) with an understory of chino bamboo (Pleioblastus chino). We established three plots for vegetation control, including an overstory plot (removal of understory), a bamboo plot (removal of overstory), and a control plot (both overstory and understory remained). Throughfall amounts relative to precipitation were 61% in the control plot, 54% in the overstory plot, and 31% in the bamboo plot. Average stemflow in control and overstory plots was 3% of precipitation. The significant difference in throughfall for the bamboo plot may have been caused by the high density of understory vegetation. A large portion of intercepted water is transferred to the ground as bamboo culm flow in the understory beneath the canopy in the control plot and in the bamboo plot. Our experiment highlighted the significance of understory vegetation in altering hydrological processes from canopy to understory vegetation.

    DOI: 10.3178/hrl.11.181

    Scopus

  32. Fallout volume and litter type affect Cs-137 concentration difference in litter between forest and stream environments 査読有り

    Masaru Sakai, Takashi Gomi, Junjiro N. Negishi

    JOURNAL OF ENVIRONMENTAL RADIOACTIVITY   164 巻   頁: 169 - 173   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    It is important to understand the changes in the Cs-137 concentration in litter through leaching when considering that Cs-137 is transferred from basal food resources to animals in forested streams. We found that the difference of Cs-137 activity concentration in litter between forest and stream was associated with both litter type and Cs-137 fallout volume around Fukushima, Japan. The Cs-137 activity concentrations in the litter of evergreen conifers tended to be greater than those in the litter of broad-leaved deciduous trees because of the absence of deciduous leaves during the fallout period in March 2011. Moreover, Cs-137 activity concentrations in forest litter were greater with respect to the Cs-137 fallout volume. The Cs-137 activity concentrations in stream litter were much lower than those in forest litter when those in forest litter were higher. The Cs-137 leaching patterns indicated that the differences in Cs-137 activity concentration between forest and stream litter could change with changes in both fallout volume and litter type. Because litter is an important basal food resource in the food webs of both forests and streams, the Cs-137 concentration gradient reflects to possible Cs-137 transfer from lower to higher trophic animals. Our findings will improve our understanding of the spatial heterogeneity and variability of Cs-137 concentrations in animals resident to the contaminated landscape. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jenvrad.2016.07.030

    Web of Science

  33. Immediate change in throughfall spatial distribution and canopy water balance after heavy thinning in a dense mature Japanese cypress plantation 査読有り

    Kazuki Nanko, Yuichi Onda, Hiroaki Kato, Takashi Gomi

    ECOHYDROLOGY   9 巻 ( 2 ) 頁: 300 - 314   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    This study revealed the influence of change in forest canopy structure by forest management practice for throughfall generation and canopy water interception process. Throughfall and stemflow were observed in a mature Japanese cypress (Chamaecyparis obtusa) plantation before and after thinning. Decreased stem density (from 2400 to 1300treesha(-1)) and basal area (from 107.6 to 60.4m(2)ha(-1)) resulted in an increase in the throughfall fraction (from 58% to 79%) and decreases in the stemflow fraction (from 14% to 8.6%) and the canopy interception loss fraction (from 27% to 12%). Thinning also decreased spatial variability in throughfall and smoothed temporal persistence of throughfall among sampling points or rainfall events. These results were supported by the change in the throughfall balance between direct throughfall and released throughfall. The proportion of direct throughfall of incident rainfall changed from 0.16 to 0.42 owing to an increase in canopy gap. The distribution ratio of released throughfall from intercepted rainwater by canopy changed from 50% to 64% because of a decrease in foliage; this led to lower water storage in the canopy (from 1.83 to 0.82mm), and thus less precipitation was needed to saturate the canopy. Consequently, the amount of throughfall increased and less precipitation was needed to stabilize the water flow path during the post-thinning period. This study contributes to knowledge of differential canopy wetting processes and spatiotemporal heterogeneity of throughfall distribution in response to specific silvicultural prescription. Copyright (c) 2015 John Wiley & Sons, Ltd.

    DOI: 10.1002/eco.1636

    Web of Science

  34. Different cesium-137 transfers to forest and stream ecosystems 査読有り

    Masaru Sakai, Takashi Gomi, Junjiro N. Negishi, Aimu Iwamoto, Kengo Okada

    ENVIRONMENTAL POLLUTION   209 巻   頁: 46 - 52   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    Understanding the mechanisms of Cs-137 movement across different ecosystems is crucial for projecting the environmental impact and management of nuclear contamination events. Here, we report differential movement of Cs-137 in adjacent forest and stream ecosystems. The food webs of the forest and stream ecosystems in our study were similar, in that they were both dominated by detrital -based food webs and the basal energy source was terrestrial litter. However, the concentration of Cs-137 in stream litter was significantly lower than in forest litter, the result of Cs-137 leaching from litter in stream water. The difference in Cs-137 concentrations between the two types of litter was reflected in the Cs-137 concentrations in the animal community. While the importance of Cs-137 fallout and the associated transfer to food webs has been well studied, research has been primarily limited to cases in a single ecosystem. Our results indicate that there are differences in the flow of Cs-137 through terrestrial and aquatic ecosystems, and that Cs-137 concentrations are reduced in both basal food resources and higher trophic animals in aquatic systems, where primary production is subsidized by a neighboring terrestrial ecosystem. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.envpol.2015.11.025

    Web of Science

  35. Influence of strip thinning on nutrient outflow concentrations from plantation forested watersheds 査読有り

    Takehiko Fukushima, Rai Tei, Hiroyuki Arai, Yuichi Onda, Hiroaki Kato, Shimpei Kawaguchi, Takashi Gomi, Bui X. Dung, Sooyoun Nam

    HYDROLOGICAL PROCESSES   29 巻 ( 24 ) 頁: 5109 - 5119   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    Nutrient concentrations in stream water, rainfall, throughfall, stemflow, surface flow and ground water were compared before, during and after strip thinning (intensive 50%) in plantation forested watersheds in Tochigi, Japan. Influences were evaluated comparing four thinning-applied and two reference basins for 1 year before, 6 months during and 1 year after the thinning. Results show that this strip thinning significantly increased dissolved total phosphorus, total phosphorus and dissolved organic carbon (0.01, 0.04 and 0.53 mg l(-1), respectively) during the thinning period and dissolved total nitrogen and total nitrogen (0.34 and 0.46 mg l(-1), respectively) after the thinning in stream waters relative to the unthinned basins. The increased phosphorus during thinning indicated ground disturbances by the strip thinning, with a concomitant increase in dissolved organic carbon. Changes in biotic and abiotic conditions resulted in increased nitrogen after the thinning, particularly in the dissolved pool. Changes in hydrological processes due to thinning, for example, a change in flow distributions (less high nutrient stemflow and more low nutrient throughfall) and an increase in water discharge in stream water, possibly weakened the direct influences of thinning on nutrient concentrations. Copyright (C) 2015 John Wiley & Sons, Ltd.

    DOI: 10.1002/hyp.10570

    Web of Science

  36. Effect of strip thinning on rainfall interception in a Japanese cypress plantation 査読有り

    Xinchao Sun, Yuichi Onda, Hiroaki Kato, Takashi Gomi, Hikaru Komatsu

    JOURNAL OF HYDROLOGY   525 巻   頁: 607 - 618   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We examined the effect of strip thinning on rainfall interception (Et) in a 32-year-old Japanese cypress plantation in central Japan. Strip thinning was conducted in the catchment in October 2011; that removed 50% of the stems. The gross precipitation (Pg), throughfall (TF) and stemflow (SF) were monitored in a 12-m x 13-m plot before and after thinning. Et was calculated as the difference between Pg and the sum of TF and SF. The interception processes were illustrated using the revised Gash model with quantifying interception parameters. The results showed that the Gash model successfully predicted Et on a rainy-season basis in both pre- and post-thinning periods. Thinning altered the interception components whereas the largest part during and after rainfall accounted for similar proportion in both periods. Additionally, after thinning, the annual TF rate was increased from 61.4% to 73.0%, whereas the annual SF rate was decreased from 9.8% to 6.1%, and the annual E-i rate was decreased from 28.7% to 20.8%. The summarized findings of previous studies indicate that the degree of decline in the Ei caused by thinning is related to Pg and the thinning ratio. These results provide useful information for understanding the changes in interception processes induced by thinning, and for acquiring a more accurate forecast of the effects of forest management practices on water resources in the watershed. The response in rainfall partitioning to strip thinning can also help us to acquire an integrated understanding of the changes in canopy water balance under different forest practices. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jhydrol.2015.04.023

    Web of Science

  37. Characteristics of deep catastrophic landslides around the world 査読有り

    Takashi, Gomi, Kazutaka, Aoto, Marino, Hiraoka, Kyoko, Kikuchi, Tadanori, Ishizuka, Koji, Morita, Taro, Uchida

    Proceedings of INTERPRAEVENT in the Pacific Rim     頁: 61 - 67   2014年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  38. Linkages among land use, macronutrient levels, and soil erosion in northern Vietnam: A plot-scale study 査読有り

    Pham Thi Quynh Anh, Takashi Gomi, Lee H. MacDonald, Shigeru Mizugaki, Phung Van Khoa, Takahisa Furuichi

    GEODERMA   232 巻   頁: 352 - 362   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Objective: This study examined the interrelations among vegetative cover and biomass, soil macronutrient levels, and soil erosion in northern Vietnam.
    Methods: We selected ten dominant land-use types in a hilly area of western Hanoi including bare soil, agriculture (cassava or lemon grass), shrub land, five types of plantation forest, and indigenous forest. We measured the understory biomass, litter biomass, canopy openness, soil moisture content, soil pedestal height, soil hardness, soil bulk density,Cs-157 and Pb-210(ex) activities, and soil carbon and nitrogen on three 1 m(2) plots for each land-use type. Soil erosion was calculated from both pedestal heights and radionuclides. Multivariate statistical analysis was used to identify the key factors controlling soil erosion and nutrient accumulations.
    Results: Understoty biomass ranged from 2 to 375 g m(-2), and this tended to be higher in most of the forest types and shrubland than in cassava and lemon grass. In contrast, the amount of ground cover varied more by forest type than between the agricultural land uses and forest lands. The height of soil pedestals indicated that short-term soil erosion was negligible when understory biomass was greater than 130 to 150 g m(2). Cs-137 was only detected in the cassava plots, whereas Pb-210(ex). indicated widely different erosion rates across the land uses, with lower values in the agricultural lands and two types of forest plantations, although this may be due to soil management practices. Both the correlation and principal component analyses showed that soil organic carbon and nitrogen were positively correlated to understory biomass and strongly and inversely influenced by bulk density. Soil erosion as indicated by soil pedestal height was strongly and inversely controlled by ground cover, litter, and understory biomass. Soil erosion was also heavily influential to soil chemical richness and bulk density.
    Conclusions: Ground vegetation cover and the resultant soil erosion processes altered the production and accumulation of SOC, while forest cover did not always result in high soil fertility or low erosion. A simple characterization of forest or non-forest is not sufficient to calculate carbon and nutrient stocks, or assess erosion risk.
    Practice: Understory biomass of at least 130 g m(-2) and high ground cover are essential for reducing soil erosion and sustaining short- and long-term soil productivity. Implications: Rapidly developing areas in Southeast Asia, including hilly areas in North Vietnam, need to maintain understory biomass and ground cover for soil and nutrient conservation. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.geoderma.2014.05.011

    Web of Science

  39. Vertical distribution of radiocesium in coniferous forest soil after the Fukushima nuclear power plant accident 査読有り

    Mengistu T. Teramage, Yuichi Onda, Jeremy Patin, Hiroaki Kato, Takashi Gomi, Sooyoun Nam

    JOURNAL OF ENVIRONMENTAL RADIOACTIVITY   137 巻   頁: 37 - 45   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    This study deals with the description of the vertical distribution of radiocaesium (Cs-137 and Cs-134) in a representative coniferous forest soil, investigated 10 months after the Fukushima radioactive fallout. During soil sampling, the forest floor components (understory plants, litter (Ol-) and fermented layers (Of)) were collected and treated separately. The results indicate that radiocesium is concentrated in the forest floor, and high radiocesium transfer factor observed in the undergrowth plants (3.3). This made the forest floor an active exchanging interphase for radiocesium. The raw organic layer (Ol + Of) holds 52% (5.3 kBq m(-2)) of the Fukushima-derived and 25% (0.7 kBq m(-2)) of the pre-Fukushima Cs-137 at the time of the soil sampling. Including the pre-Fukushima Cs-137, 99% of the total soil inventory was in the upper 10 cm, in which the organic matter (OM) content was greater than 10%, suggesting the subsequent distribution most likely depends on the OM turnover. However, the small fraction of the Fukushima-derived Cs-137 at a depth of 16 cm is most likely due to the infiltration of radiocesium-circumscribed rainwater during the fallout before that selective adsorption prevails and reduces the migration of soluble Cs-137. The values of the depth distribution parameters revealed that the distribution of the Fukushima-derived Cs-137 was somewhat rapid. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jenvrad.2014.06.017

    Web of Science

  40. Estimating the Occurrence Ages of Deep Catastrophic Landslides using a Tephrochronological Approach. 査読有り

    Aoto K, Gomi T, Hiraoka M, Ishizuka T, Morita K, Isshiki H, Uchida T

    INTERPRAEVENT 2014- proceeding   0 巻 ( 0 ) 頁: 00 - 00   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  41. The role of litterfall in transferring Fukushima-derived radiocesium to a coniferous forest floor 査読有り

    Teramage, M. T, Onda, Y, Kato, H, Gomi, T

    Science of The Total Environment   490 巻   頁: 435 - 439   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.scitotenv.2014.05.034.

  42. Human factors and tidal influences on water quality of an urban river in Can Tho, a major city of the Mekong Delta, Vietnam

    Hirokazu Ozaki, Thi Kinh Co, Anh Kha Le, Viet Nu Pham, Van Be Nguyen, Mitsunori Tarao, Huu Chiem Nguyen, Viet Dung Le, Hieu Trung Nguyen, Masaki Sagehashi, Sachi Ninomiya-Lim, Takashi Gomi, Masaaki Hosomi, Hideshige Takada

    ENVIRONMENTAL MONITORING AND ASSESSMENT   186 巻 ( 2 ) 頁: 845 - 858   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    In this study, we focused on water quality in an urban canal and the Mekong River in the city of Can Tho, a central municipality of the Mekong Delta region, southern Vietnam. Water temperature, pH, electrical conductivity, BOD5, CODCr, Na+, Cl-, NH4 (+)-N, SO4 (2-)-S, NO3 (-)-N, and NO2 (-)-N for both canal and river, and tide level of the urban canal, were monitored once per month from May 2010 to April 2012. The urban canal is subject to severe anthropogenic contamination, owing to poor sewage treatment. In general, water quality in the canal exhibited strong tidal variation, poorer at lower tides and better at higher tides. Some anomalies were observed, with degraded water quality under some high-tide conditions. These were associated with flow from the upstream residential area. Therefore, it was concluded that water quality in the urban canal changed with a balance between dilution effects and extent of contaminant supply, both driven by tidal fluctuations in the Mekong River.

    DOI: 10.1007/s10661-013-3421-y

    Web of Science

  43. Merging perspectives in the catchment sciences: the US-Japan Joint Seminar on catchment hydrology and forest biogeochemistry 査読有り

    Kevin J. McGuire, Stephen D. Sebestyen, Nobuhito Ohte, Emily M. Elliott, Takashi Gomi, Mark B. Green, Brian L. McGlynn, Naoko Tokuchi

    HYDROLOGICAL PROCESSES   28 巻 ( 5 ) 頁: 2878 - 2880   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    DOI: 10.1002/hyp.10129

    Web of Science

  44. Stream and bed temperature variability in a coastal headwater catchment: influences of surface-subsurface interactions and partial-retention forest harvesting

    S. M. Guenther, T. Gomi, R. D. Moore

    HYDROLOGICAL PROCESSES   28 巻 ( 3 ) 頁: 1238 - 1249   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    Stream temperature was recorded between 2002 and 2005 at four sites in a coastal headwater catchment in British Columbia, Canada. Shallow groundwater temperatures, along with bed temperature profiles at depths of 1 to 30cm, were recorded at 10-min intervals in two hydrologically distinct reaches beginning in 2003 or 2004, depending on the site. The lower reach had smaller discharge contributions via lateral inflow from the hillslopes and fewer areas with upwelling (UW) and/or neutral flow across the stream bed compared to the middle reach. Bed temperatures were greater than those of shallow groundwater during summer, with higher temperatures in areas of downwelling (DW) flow compared to areas of neutral and UW flow. A paired-catchment analysis revealed that partial-retention forest harvesting in autumn 2004 resulted in higher daily maximum stream and bed temperatures but smaller changes in daily minima. Changes in daily maximum stream temperature, averaged over July and August of the post-harvest year, ranged from 1.6 to 3 degrees C at different locations within the cut block. Post-harvest changes in bed temperature in the lower reach were smaller than the changes in stream temperature, greater at sites with DW flow, and decreased with depth at both UW and DW sites, dropping to about 1 degrees C at a depth of 30cm. In the middle reach, changes in daily maximum bed temperature, averaged over July and August, were generally about 1 degrees C and did not vary significantly with depth. The pre-harvest regression models for shallow groundwater were not suitable for applying the paired-catchment analysis to estimate the effects of harvesting. However, shallow groundwater was warmer at the lower reach following harvesting, despite generally cooler weather compared to the pre-harvest year. Copyright (c) 2012 John Wiley & Sons, Ltd.

    DOI: 10.1002/hyp.9673

    Web of Science

  45. Effect of canopy interception on spatial variability and isotopic composition of throughfall in Japanese cypress plantations 査読有り

    Hiroaki Kato, Yuichi Onda, Kazuki Nanko, Takashi Gomi, Tsutomu Yamanaka, Shimpei Kawaguchi

    Journal of Hydrology   504 巻 ( 11 ) 頁: 1 - 11   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We conducted a field monitoring experiment examining throughfall in Japanese cypress plantations located in Tochigi Prefecture, eastern Japan. A set of 20 tipping-bucket rain gauges and throughfall collectors were placed in a lattice-like distribution throughout a 10× 10-m experimental plot to investigate the effect of the forest canopy on the spatial variability of throughfall. The isotopic composition of throughfall and open rainfall were analyzed and compared for each rainfall event. A clear relationship between throughfall rate and the radial distance to the nearest tree trunk was observed when the influence of wind was negligible
    however, such a systematic pattern of throughfall was not observed during rainfall events that occurred during windy conditions. The δ18O and δD values in throughfall varied considerably, reflecting different rainwater flow paths in the saturated canopy. The analysis of stable isotope ratios in the throughfall and its comparison with isotopic composition of rainwater hitting the canopy can help elucidate the interception processes in the forest canopy. © 2013 Elsevier B.V.

    DOI: 10.1016/j.jhydrol.2013.09.028

    Scopus

  46. スギ・ヒノキ人工林渓流における水生生物の生息状況:東京農工大学フィールドミュージアム唐沢山における事例 査読有り

    渡邉祐介, 五味高志, 布川雅典, 境優

    フィールドサイエンス   11 巻   頁: 31 - 40   2013年3月

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    記述言語:日本語   掲載種別:研究論文(大学,研究機関等紀要)  

  47. 大洞沢試験流域における流出土砂量と土砂生産源の季節変動

    平岡, 真合乃, 五味高志, 小田智基, 熊倉歩, 宮田秀介, 内山佳美

    神奈川県自然環境保全センター報告   10 巻   頁: 71 - 79   2013年3月

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    記述言語:日本語   掲載種別:研究論文(大学,研究機関等紀要)  

  48. Distribution of amphipods (Gammarus nipponensis Ueno) among mountain headwater streams with different legacies of debris flow occurrence

    Kobayashi Sohei, Gomi Takashi, Sidle Roy C., Negishi Junjiro N.

    ECOHYDROLOGY   6 巻 ( 1 ) 頁: 117 - 124   2013年2月

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  49. Interception of the Fukushima reactor accident-derived Cs-137, Cs-134 and I-131 by coniferous forest canopies 査読有り

    Hiroaki Kato, Yuichi Onda, Takashi Gomi

    GEOPHYSICAL RESEARCH LETTERS   39 巻 ( 20 ) 頁: 00 - 00   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER GEOPHYSICAL UNION  

    The Fukushima Daiichi nuclear power plant accident resulted in extensive radioactive contamination of the surrounding forests. In this study, we analyzed fallout Cs-137, Cs-134, and I-131 in rainwater, throughfall, and stemflow in coniferous forest plantations immediately after the accident. We show selective fractionation of the deposited radionuclides by the forest canopy and contrasting transfer of radiocesium and I-131 from the canopy to the forest floor in association with precipitation. More than 60% of the total deposited radiocesium remained in the canopy after 5 month of the initial fallout, while marked penetration of the initially deposited I-131 through the canopy was observed. The halflives of Cs-137 absorbed in the cypress and cedar canopies were calculated as 620 days and 890 days, respectively for the period of 0-160 days. The transfer of the deposited radiocesium from the canopy to the forest floor was slow compared with that of the spruce forest affected by fallout from the Chernobyl nuclear reactor accident. Citation: Kato, H., Y. Onda, and T. Gomi (2012), Interception of the Fukushima reactor accident-derived Cs-137, Cs-134 and I-131 by coniferous forest canopies, Geophys. Res. Lett., 39, L20403, doi:10.1029/2012GL052928.

    DOI: 10.1029/2012GL052928

    Web of Science

  50. Estimation of forest harvesting-induced stream temperature changes and bioenergetic consequences for cutthroat trout in a coastal stream in British Columbia, Canada

    J. A. Leach, R. D. Moore, S. G. Hinch, T. Gomi

    AQUATIC SCIENCES   74 巻 ( 3 ) 頁: 427 - 441   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER BASEL AG  

    Data from a paired-catchment study in south coastal British Columbia, Canada, were analyzed to assess the thermal effects of clearcut harvesting with no riparian buffer on a fish-bearing headwater stream. The approach used time series of daily mean water temperatures for East Creek (control) and A Creek (treatment), both before and after harvest. Statistical models were developed to predict (a) what the temperatures would have been in the post-harvest period had harvesting not occurred, and (b) what temperatures would have been in the pre-harvest period had harvesting already occurred. The Wisconsin Bioenergetics Model was used to simulate growth of coastal cutthroat trout (Oncorhynchus clarki clarki) for the first year following fry emergence using the predicted and observed stream temperatures to generate scenarios representing with-harvest and no-harvest thermal regimes. A Monte Carlo approach was used to quantify the effects of uncertainty associated with the regression models on predicted stream temperature and trout growth. Summer daily mean temperatures in the with-harvest scenario were up to higher than those for the no-harvest scenario. Harvesting-induced warming reduced growth rates during summer, but increased growth rates during autumn and spring. In the with-harvest scenario, trout were 0.2-2.0 g (absolute weight) smaller throughout the winter period than in the no-harvest scenario. However, the bioenergetic simulations suggest that trout growth may be more sensitive to potential changes in food supply following harvesting than to direct impacts of stream temperature changes.

    DOI: 10.1007/s00027-011-0238-z

    Web of Science

  51. 丹沢山大洞沢観測流域における水と土砂動態観測

    五味 高志, 小田 智基, 鈴木 雅一, 平岡 真合乃, 宮田 秀介, 内山 佳美, 山根 正伸

    砂防学会誌   65 巻 ( 1 ) 頁: 01 - 02   2012年

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)   出版者・発行元:公益社団法人 砂防学会  

    DOI: 10.11475/sabo.65.1_01

    CiNii Research

  52. Downslope soil detachment-transport on steep slopes via rain splash

    Ghahramani Afshin, Ishikawa Yoshiharu, Gomi Takashi, Miyata Shusuke

    HYDROLOGICAL PROCESSES   25 巻 ( 15 ) 頁: 2471 - 2480   2011年7月

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  53. Slope length effect on sediment and organic litter transport on a steep forested hillslope: upscaling from plot to hillslope scale 査読有り

    Afshin Ghahramani, Yoshiharu Ishikawa, Takashi Gomi

    Hydrological Research Letters   5 巻   頁: 16 - 20   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    Upscaling and the effect of slope length on the sediment production are important issues in hillslope hydrology. This study investigated the effect of slope length at a steep forested site between 2006 and 2010 using erosion plots and neighboring sediment traps. The hillslope had high litter cover but sparse understory due to overgrazing by wild deer. Sediment transport increased for short distances (5 m to 10 m), then decreased over the hillslope (> 10 m). In plots this effect was due to organic litter accumulation. Organic litter production declined progressively along the hillslope continuum. When accumulated organic litter altered the microtopography, sediment production declined more with increase in slope length. Heavy precipitation events did not change the pattern of these scale effects. These results demonstrate that the slope length effect had inconsistent controls on sediment transport due to variations in soil surface conditions of the landscape. Such variations in the slope length effect cause uncertainty in sediment flux estimations in steep forested landscapes.<br>

    DOI: 10.3178/hrl.5.16

  54. Effect of forest thinning on overland flow generation on hillslopes covered by Japanese cypress

    Bui Xuan Dung, Shusuke Miyata, Takashi Gomi

    ECOHYDROLOGY   4 巻 ( 3 ) 頁: 367 - 378   2011年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    We examined the effect of forest thinning on overland flow generation on hillslopes covered by a Japanese cypress plantation in central Japan. We established hillslope plots in two small catchments for monitoring overland flow generation. Plot 1 was a treatment plot in which 58.3% of stems were removed, whereas plot 2 remained untreated as a control. Overland flow generation was examined using (1) time-trend analysis that compared overland flow to precipitation 2 years pre- and 2 years post-thinning in plot 1 and (2) a paired-plot approach that compared the treated hillslope plot to the control hillslope plot. The latter approach was more reliable for identifying treatment effects than time-trend analysis because it minimizes effects of climate variables such as precipitation. Unlike our initial hypothesis for decreasing overland flow after thinning, paired-plot analysis indicated that after thinning, mean overland flow increased 7.4% (corresponding to 2.1 mm) in response to individual storms and 4.8% (corresponding to 7.9 mm) based on monthly data. Although the increased overland flow is likely associated with reduced canopy interception, the reduction of canopy interception after the thinning was estimated to be greater than the increases in overland flow. Therefore, sonic of the increased throughfall was infiltrated into the soil matrix. Such changes in hillslope-scale runoff in response to thinning alter the distribution of water in the surface and subsurface layers of forested headwater basins. Copyright (C) 2010 John Wiley & Sons, Ltd.

    DOI: 10.1002/eco.135

    Web of Science

  55. Effect of ground cover on splash and sheetwash erosion over a steep forested hillslope: A plot-scale study 査読有り

    Afshin Ghahramani, Yoshiharu Ishikawa, Takashi Gomi, Katsushige Shiraki, Shusuke Miyata

    CATENA   85 巻 ( 1 ) 頁: 34 - 47   2011年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The contributions and relationships of erosion by splash and overland flow over a steep slope in a Japanese beech forest in plots with different percentages of ground cover were examined. Three erosion plots (2 m wide x 5 m long) with average understory coverage of 1%, 45%, and 94% were installed. Sediment transported by rain splash and by overland flow was sampled separately. For the plots with sparse, moderate, and high understory coverage, the average proportions of splash soil to total soil erosion during the monitoring period were 16%, 32%, and 18%, respectively. A significant correlation between the amount of splash soil and precipitation was found in the plots with 1% and 45% understory coverage, whereas no statistical relationship was identified for the plot with high understory coverage. At the sparse ground cover plot showing the largest sediment movement, the contribution of splash transport decreased with increasing precipitation. The amount of sheetwash erosion was significantly correlated with the amount of splash soil under the condition of sparse ground cover. This relationship was more pronounced during high precipitation events and the rainy season. Splash contribution to the sediment transport was in the range of 0.8%-76.7%. 2.8%-81% and 2.1%-60.8% for plot with high, moderate and low ground cover, respectively. The sparse ground cover showed the largest variation of splash and sheetwash contribution in soil erosion. This variability was due to variation in ground cover and soil surface wetness condition which led to a variation of detachment and non-linear relationship of sheetwash splash. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.catena.2010.11.005

    Web of Science

  56. Analysis of stream water temperature changes during rainfall events in forested watersheds

    Subehi Luki, Fukushima Takehiko, Onda Yuichi, Mizugaki Shigeru, Gomi Takashi, Kosugi Ken'ichirou, Hiramatsu Shinya, Kitahara Hikaru, Kuraji Koichiro, Terajima Tomomi

    LIMNOLOGY   11 巻 ( 2 ) 頁: 115 - 124   2010年8月

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  57. Short-term responses of macroinvertebrate drift following experimental sediment flushing in a Japanese headwater channel 査読有り

    Takashi Gomi, Sohei Kobayashi, Junjiro N. Negishi, Fumitoshi Imaizumi

    LANDSCAPE AND ECOLOGICAL ENGINEERING   6 巻 ( 2 ) 頁: 257 - 270   2010年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER TOKYO  

    We examined short-term responses of macroinvertebrate drift associated with experimental sediment flushing in a headwater. Increases in the drifting abundances of Ephemeroptera and Plecoptera coincided with increases in bed load yield rather than peaks in discharge or suspended sediment concentrations. The approach and arrival of a sediment wave may provide a physical cue that initiates the escape of benthic macroinvertebrates. Because fine bed load sediments, with diameters &lt; 4 mm, tended to accumulate on and in the substrate matrix, such sedimentation affected the benthic macroinvertebrates residing on and in the substrate, increasing the number of macroinvertebrates in the drift. Therefore, the decreases observed in the densities of most macroinvertebrate taxa following sediment flushing were probably associated with sediment deposition and the resulting escape of macroinvertebrates from benthic habitats. The magnitudes of the decreases in macroinvertebrate density were lower at sites located 200 m downstream from the sediment sources than at sites located 20 m downstream. The results from this experimental flushing study suggest that bed load movement and resulting sediment accumulation alter macroinvertebrate drift patterns and cause decreases in the abundances of benthic macroinvertebrates in headwater streams.

    DOI: 10.1007/s11355-010-0107-2

    Web of Science

  58. An overview of the field and modelling studies on the effects of forest devastation on flooding and environmental issues

    Yuichi Onda, Takashi Gomi, Shigeru Mizugaki, Toshiro Nonoda, Roy C. Sidle

    HYDROLOGICAL PROCESSES   24 巻 ( 5 ) 頁: 527 - 534   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JOHN WILEY & SONS LTD  

    Intensive field observations as well as monitoring of discharge, water quality, and soil erosion have been conducted in forest plantations in order to identify the effects of forest cover and management practices on runoff generation, sediment transport, and downstream environmental issues. Five experimental catchments, each with rather uniform lithology, were established in both managed and unmanaged plantations of Japanese cypress and cedar, as well as broadleaf forests. Field monitoring was conducted from sub-plots (e. g. splash cups) to small hillslope plots (0.5 x 2 m) to large hillslope-scale plots to first order streams (0.1-4 ha) and finally to larger catchments (&gt;4 ha) in a nested structure. Remote sensing techniques were employed to identify broad scale forest stand and soil surface conditions. As part of this integrated study, these field-based monitoring and remote sensing techniques provide information for modelling runoff generation and developing adaptive management schemes with respect to catchment-scale water resources. Copyright (C) 2010 John Wiley & Sons, Ltd.

    DOI: 10.1002/hyp.7548

    Web of Science

  59. Disturbances structuring macroinvertebrate communites in steep headwater streams: relative importance of forest clearcutting and debirs flow occurrance

    Kobayashi S, Gomi T, Sidle R.C, Takemon Y

    Canadian Journal of Fishries and Aquatic Sciences   67 巻   頁: 1 - 18   2010年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1139/F09-186

  60. Erosion processes in a Japanese cypress plantation catchment estimated from measurement of Cs-137 and Pb-210ex activities in suspended sediment 査読有り

    Fukuyama T, Onda Y, Gomi T, Yamamoto K, Kondo N, Miyata S, Kosugi K, Mizugaki S, Tsubonuma N

    Hydrological Processes   24 巻 ( 0 ) 頁: 535 - 545   2010年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  61. Evaluation of storm runoff pathway in steep nested catchments draining a Japanese cypress forest in central Japan : A hydrometric, geochemical, and isotopic approaches 査読有り

    五味 高志

    Hydrological Processes 24     頁: 550 - 566   2010年

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  62. ヒノキ人工林流域における表面流の発生と流域の降雨流出特性

    五味 高志, 宮田 秀介, 恩田 裕一

    水利科学   53 巻 ( 6 ) 頁: 77 - 94   2010年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本治山治水協会  

    DOI: 10.20820/suirikagaku.53.6_77

    CiNii Research

  63. Impact of road-generated storm runoff on a small catchment response

    Woldie Daniel W., Sidle Roy C., Gomi Takashi

    HYDROLOGICAL PROCESSES   23 巻 ( 25 ) 頁: 3631 - 3638   2009年12月

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  64. Effects of forest floor coverage on overland flow and soil erosion on hillslopes in Japanese cypress plantation forests

    Miyata Shusuke, Kosugi Ken'ichirou, Gomi Takashi, Mizuyama Takahisa

    WATER RESOURCES RESEARCH   45 巻   2009年6月

  65. Changes in bedload transport rate associated with episodic sediment supply in a Japanese headwater channel 査読有り

    Fumitoshi Imaizumi, Takashi Gomi, Sohei Kobayashi, Junjiro N. Negishi

    CATENA   77 巻 ( 3 ) 頁: 207 - 215   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We conducted field monitoring of bedload transport rate associated with experimental sediment release in a natural channel to clarify behavior of the supplied sediment on mixed size bed. Observation of bedload rate at two sites along the 30 m channel reach revealed that downstream migration of finer particles delay compared with coarser particles. Ratio of the bedload sediment that deposited during the migration was higher for finer sediments. These behaviors of the mixed size particles were clear during passage of the sediment wave without changes in water discharge. Flashing peak of discharge that caused artificially by opening of the dam gate did not destroy channel bed structure including steps and pools formed by coarser sediments, and only small amount of bedload was mobilized. Both reach scale channel features including steps, pools, and riffles as well as fine scale features (i.e., armour coat) likely increased critical shear stress of particles and decreased bedload rate during our experiment. Extreme sediment supply induced two types of sediment deposition; (1) filling the pools in reach sales and (2) the intrusion of fine particles into the coarser sediment that formed an armour layer. The all grain size fractions can deposit as type (1) when shear stress of stream water is not enough to entrain bedload particles, while deposition type (2) occurs when finer sediment pass over channel bed on which armour coat is well-developed. Deposition of finer sediment into coarser sediment that forms armour coat is affected by grain size distribution of bed surface sediment. Thus, impact of the sediment supply on downstream channel depends on both bedforms and grain size distribution of bed surface sediment over which the supplied sediment pass. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.catena.2008.12.015

    Web of Science

  66. Influences of forested watershed conditions on fluctuations in stream water temperature with special reference to watershed area and forest type

    Luki Subehi, Takehiko Fukushima, Yuichi Onda, Shigeru Mizugaki, Takashi Gomi, Tomomi Terajima, Ken&apos;ichirou Kosugi, Shinya Hiramatsu, Hikaru Kitahara, Koichiro Kuraji, Noriatsu Ozaki

    LIMNOLOGY   10 巻 ( 1 ) 頁: 33 - 45   2009年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER TOKYO  

    In order to gain insight into the effect of watershed conditions on fluctuations in stream water temperature, we statistically analyzed water temperature data for 1 year, using root mean square (Rms) and harmonic (A Amplitude, phi delay time) methods. The average values of delay time (days) between air and water temperatures (T (a) and T (w)) of small (&lt; 0.5 ha), medium (0.5-100 ha) and large (&gt; 100 ha) watersheds were 4.53 +/- A 0.82 days, 11.83 +/- A 3.88 days and 4.45 +/- A 1.52 days, respectively. Fluctuations in stream water temperature expressed by Rms (Rms T (w)/Rms T (a)) and harmonic methods (A -T (w)/A -T (a)) in the medium-sized watersheds with moderate slope gradients were 0.37 +/- A 0.09 and 0.56 +/- A 0.14, respectively. These values increased in the larger watersheds with low slope gradients, including five large rivers covered by various landscapes, with their averages of 0.53 +/- A 0.09 and 0.78 +/- A 0.09, respectively, indicating the influences of solar radiation and heat transfer processes. In the smaller watersheds with high slope gradients, these values were 0.73 +/- A 0.02 and 0.87 +/- A 0.03, respectively, suggesting that shorter passage time affected water temperatures. With respect to forest type, these values at badly managed hinoki forest watersheds (0.45 +/- A 0.04 and 0.73 +/- A 0.07) were larger than those at broadleaf forest (0.34 +/- A 0.04 and 0.51 +/- A 0.12) and well-managed hinoki forest (0.33 +/- A 0.04 and 0.51 +/- A 0.07) watersheds, indicating different proportions of flow paths.

    DOI: 10.1007/s10201-008-0258-0

    Web of Science

  67. ヒノキ林小流域の水文過程における土壌撥水性の役割

    宮田 秀介, 小杉 賢一朗, 五味 高志

    土壌の物理性   111 巻 ( 0 ) 頁: 9 - 16   2009年

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    記述言語:日本語   出版者・発行元:土壌物理学会  

    ヒノキ林流域の水流出過程における土壌撥水性の影響を検討するために,撥水性の測定,斜面での浸透強度測定,林床被覆の異なる小プロットでの表面流観測,大プロットでの表面流観測,渓流水量観測を行った.その結果,ヒノキ林表層土壌の撥水性が表面流発生の一因となり,土壌水分に依存する撥水性の強度により表面流出量が変動することが示された.降雨中には撥水性が徐々に弱められ,それに伴う表面流出量の減少と雨水の鉛直浸透の形態が変化した.また小プロットと大プロットの比較から,大プロットでは表面流の流れが不連続となり,観測スケールが大きいほど表面流出量が小さくなることが明らかとなった.さらに流域スケールでは,斜面下部において浸透が卓越するために降雨流出に対する表面流の寄与は小さく,流域スケールでは土壌撥水性の降雨流出に対する影響は小さいことが示唆された.

    DOI: 10.34467/jssoilphysics.111.0_9

    CiNii Research

  68. A new method to measure substrate coherent strength of Stenopsyche marmorata

    Nunokawa Masanori, Gomi Takashi, Negishi Junjiro N., Nakahara Osamu

    LANDSCAPE AND ECOLOGICAL ENGINEERING   4 巻 ( 2 ) 頁: 125 - 131   2008年11月

  69. Characteristics of overland flow generation on steep forested hillslopes of central Japan 査読有り

    Takashi Gomi, Roy C. Sidle, Masayasu Ueno, Shusuke Miyata, Ken&apos;ichirou Kosugi

    JOURNAL OF HYDROLOGY   361 巻 ( 3-4 ) 頁: 275 - 290   2008年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Overland flow generation was monitored. in large plots (8 x 25 m) on four hillslopes in a 4.9-ha catchment in Mie Prefecture, Japan. Three Japanese cypress (hinoki, Chamaecyparis obtusa) treatments (including three different understory conditions) and one deciduous forest treatment were studied. For all plots, including deciduous hillslopes, we observed overland flow even for small storm events (&lt;10 mm in total precipitation). The mean runoff coefficients in dense Japanese cypress plots with sparse understory were highest (13.0%) followed by dense Japanese cypress with fern ground cover (6.7%), and coefficients in managed cypress and deciduous forest were 3.6% and 1.2%, respectively. The runoff coefficients tended to be higher during storms that were preceded by dry conditions. High soil water repellency initially occurred in Japanese cypress forests between the titter and mineral. soil horizon and might have been partly responsible for overland flow generation. During storms with total precipitation &gt;180 mm, runoff from Japanese cypress plots with dense fern understory exhibited a delayed and higher peak associated with return flow. The dominance of hillslope-scale flow contribution to catchment runoff was also affected by changes in the dominance of overland flow and return flow. Understory vegetation cover and the availability of a titter layer altered the amount of overland flow, which was mediated by soil water repellency and soil moisture. Observations at the hillslope scale are essential for conceptualization of runoff mechanisms and pathways in forested headwaters. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jhydrol.2008.07.045

    Web of Science

  70. Baseflow concentrations of nitrogen and phosphorus in forested headwaters in Japan 査読有り

    Zhao Zhang, Takehiko Fukushima, Peijun Shi, Fulu Tao, Yuichi Onda, Takashi Gomi, Shigeru Mizuyaki, Yuko Asano, Ken'ichirou Kosugi, Shinya Hiramatsu, Hikaru Kitahara, Koichiro Kuraji, Tomomi Terajima, Kazuo Matsushige

    SCIENCE OF THE TOTAL ENVIRONMENT   402 巻 ( 1 ) 頁: 113 - 122   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    A comprehensive investigation on all dissolved nitrogen and phosphorus components at both local and regional scales in the headwaters from forested watersheds is valuable to improve our understanding of the factors controlling water quality. Here, we investigated the baseflow concentrations of dissolved nitrogen and phosphorus components, N:P ratio, and their associations with region and vegetation type in forested headwaters in fives regions of Japan. We found that inorganic nitrogen and phosphorus were the dominant components in the 26 temperate forested streams, rather than organic forms. There were significant positive correlations between the concentrations of N and P components. Furthermore, the regional patterns of the concentrations of nitrate, dissolved inorganic P (DIP), and dissolved total N (DTN) and P (DTP) were similar. Our results suggest that the regional patterns of the concentrations of N and P components should be related to the regional atmospheric deposition of both N and P nutrients. We also found that the nitrate and DTN concentrations were higher in man-made evergreen conifer (EC) than those in the natural deciduous broadleaf (DB). in contrast, the DIP and DTP concentrations in EC were lower than those in DB. The uniformly higher NT ratio in EC-than in DB-forested streams for each region suggest that EC-forested streams could be more affected by P-limited than DB-forested streams when N inputs from atmospheric sources increased. (c) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.scitotenv.2008.04.045

    Web of Science

  71. Dynamic runoff connectivity of overland flow on steep forested hillslopes: Scale effects and runoff transfer 査読有り

    Takashi Gomi, Roy C. Sidle, Shusuke Miyata, Ken&apos;ichirou Kosugi, Yuichi Onda

    WATER RESOURCES RESEARCH   44 巻 ( 8 ) 頁: W08411   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER GEOPHYSICAL UNION  

    Both scaling effect and connectivity of overland flow were examined in steep hillslopes covered by (1) Japanese cypress (hinoki, Chamecyparis obtusa) plantations with sparse understory vegetation, (2) hinoki plantations with fern understory vegetation, and (3) deciduous forests. Two sizes of plots were installed for monitoring overland flow: small (0.5 x 2 m) and large hillslope scale (8 x 24-27 m). For all hillslopes, measurable amounts of overland flow occurred during storms. Runoff coefficients of large plots (0.1-3%) were consistently smaller than those of small plots (20-40%). Estimated runoff flow lengths at the hillslope scale were based on runoff coefficients from small plots and were used to calculate runoff volume from large plots. Then we compared the differences between observed and estimated runoff volumes of large plots. Estimated runoff from large plots was smaller than observed runoff in hinoki slopes with sparse understory vegetation. Greater amounts of observed compared to estimated overland flow suggest that more runoff occurred from hillslopes with sparse understory. In contrast, estimated overland flow was larger than observed runoff from the deciduous forest, implying greater opportunities for infiltration compared to hinoki hillslopes. Comparison of estimated versus observed overland flow for successive 5 min intervals during storms indicates that runoff networks expand upslope during short and intense precipitation periods. Our examination and comparison of storm runoff from small and large plots facilitate better understanding of runoff mechanisms, scaling effects in hillslopes, and connectivity of the overland flow network.

    DOI: 10.1029/2007WR005894

    Web of Science

  72. Hyporheic flow as a potential geomorphic agent in the evolution of channel morphology in a gravel-bed river 査読有り

    Goichiro Takahashi, Takashi Gomi, Kaichiro Sasa

    CATENA   73 巻 ( 3 ) 頁: 239 - 248   2008年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Morphologic and hydrologic properties of head-cut gullies formed in meandering bends of a gravel-bed river in northern Japan were examined to investigate their topographic development. head-cut gullies had incised to 2 in below the floodplain surface and had perennial seepage outflows. Because no surface runoff was observed across the meandering necks, we hypothesized that hyporheic flow erosion cutting into the down-river edge of the meandering necks is one factor for the development of head-cut gullies. Several topographic features caused by sapping and piping erosion were observed within the head-cut gullies. A tracer experiment and examination of the water table, water chemistry, and water table responses in wells on the floodplain and within the head-cut gully revealed that significant preferential hyporheic flow occurred between coarse cobble and fine sediment layers of the floodplain materials. During a storm event, water tables around the head-cut gully quickly responded to changes in the water table of the stream channel; this result also suggests that hyporheic flow occurred across the meandering bends. Hyporheic flow around the head-cut gullies had higher hydraulic conductivities and preferential flow paths that may relate to buried beds of paleochannels. An erosion model suggests that it is unlikely that hyporheic flow alone had enough energy to account for all the soil erosion. Thus, a combination of hyporheic flow (sapping erosion) and channel erosion (bank erosion) appeared to contribute to the formation of the head-cut gullies. Hyporheic flow is an important component in the geomorphic evolution of channels and the floodplain in a gravel-bed river. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.catena.2007.10.004

    Web of Science

  73. Development, evaluation and interpretation of sediment rating curves for a Japanese small mountainous reforested watershed 査読有り

    S. H. R. Sadeghi, T. Mizuyama, S. Miyata, T. Gomi, K. Kosugi, T. Fukushima, S. Mizugaki, Y. Onda

    GEODERMA   144 巻 ( 1-2 ) 頁: 198 - 211   2008年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Extensive reforestation using Cypress, Pinus and Cedar has widely taken place in Japan since early 1960s in attempt to fulfill national wood demands and control soil erosion. In 2004 one small headwater mountainous reforested watershed encompasses 4.8 ha was established in Mie Prefecture in Japan to monitor the hydrological response. Frequently and automatically collected values of discharge and suspended sediment concentration were examined for the main outlet and five other stations, spanning from June 2004 to July 2006. In the present study, the different functional linear and non-linear sediment rating curves analytical methods were employed in the investigation of ordinary and some transformed flow discharge-suspended sediment concentration relationships for the study watershed using from 48 to 162 simultaneous discharge-sediment records (2004-2006).
    According to the results of statistical analyses using different criteria and out of many types of regression functions and data transformation, power rating curve by least square regression on fourth root transformed flow discharge and suspended sediment concentration data performed well. Contrary to what is oft-reported, the best fitted rating curves to the entire data collected for each individual station excessively overestimated the suspended sediment concentration in the study area by 113-430%. The temporal and magnitude stratification of flow discharge and sediment data, flow components separation as well as employing bias correction factor did not improve the relationship, while better estimates were obtained when power regression was applied to the fourth root transformed data separated based on their locations on rising and falling limbs of hydrographs. Results also showed a complex suspended sediment concentration and flow discharge relationship in different subwatersheds of the study reforested watershed reflecting the effect of different physical local characteristics, sediment availability, contribution of various hydrologic cycle components, and subtle variation of soil hydrophobicity on runoff generation and consequently sediment supply. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.geoderma.2007.11.008

    Web of Science

  74. Characterisation of diffuse pollutions from forested watersheds in Japan during storm events - Its association with rainfall and watershed features 査読有り

    Zhao Zhang, Takehiko Fukushima, Yuichi Onda, Shigeru Mizugaki, Takashi Gomi, Ken'ichirou Kosugi, Shinya Hiramatsu, Hikaru Kitahara, Koichiro Kuraji, Tomomi Terajima, Kazuo Matsushige, Fulu Tao

    SCIENCE OF THE TOTAL ENVIRONMENT   390 巻 ( 1 ) 頁: 215 - 226   2008年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Forest areas have been identified as important sources of nonpoint pollution in Japan. The managers must estimate stormwater quality and quantities from forested watersheds to develop effective management strategies. Therefore, stormwater runoff loads and concentrations of 10 constituents (total suspended solids, dissolved organic carbon, PO4-P, dissolved total phosphorus, total phosphorus, NH4-N, NO2-N, NO3-N, dissolved total nitrogen, and total nitrogen) for 72 events across five regions (Aichi, Kochi, Mie, Nagano, and Tokyo) were characterised. Most loads were significantly and positively correlated with stormwater variables (total event rainfall, event duration, and rainfall intensity), but most discharge-weighted event concentrations (DWECs) showed negative correlations with rainfall intensity. Mean water quality concentration during baseflow was correlated significantly with storm concentrations (r = 0.41-0.77). Although all pollutant load equations showed high coefficients of determination (R-2= 0.55-0.80), no models predicted well pollutant concentrations, except those for the three N constituents (R-2=0.59-0.67). Linear regressions to estimate stormwater concentrations and loads were greatly improved by regional grouping. The lower prediction capability of the concentration models for Mie, compared with the other four regions, indicated that other watershed or storm characteristics should be included in the prediction models. Significant differences among regions were found more frequently in concentrations than in loads for all constituents. Since baseflow conditions implied available pollutant sources for stormwater, the similar spatial characteristics of pollutant concentrations between baseflow and stormflow conditions were an important control for stormwater quality. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.scitotenv.2007.09.045

    Web of Science

  75. 国際シンポジウム「山岳地域の水資源管理と洪水軽減のための持続可能な森林管理」開催報告

    恩田,裕一, 蔵治,光一郎, 五味,高志, 水垣,滋

    水文・水資源学会誌   1 巻   頁: 69 - 71   2008年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

  76. Hortonian overland flow from Japanese forest ptantations - an aberration, the real thing, or something in between? 査読有り

    Roy C. Sidle, Tomonori Hirano, Takashi Gomi, Tomomi Terajima

    HYDROLOGICAL PROCESSES   21 巻 ( 23 ) 頁: 3237 - 3247   2007年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JOHN WILEY & SONS LTD  

    There is a growing opinion that poorly managed plantation forests in Japan are contributing to increased storm runoff and erosion. Here we present evidence to the contrary from runoff plots at two scales (hillslope and 0.5 x 2 m plots) for several forest conditions in the Mie and Nariki catchments. Runoff coefficients from small plots in untended hinoki forests were variable but typically higher than from better managed or deciduous forests during small storms at Nariki; at Mie, runoff during small events was highly variable from all small plots but runoff coefficients were similar for hinoki plots with and without understory vegetation, while the deciduous plot had lower runoff coefficients. Storm runoff was less at the hillslope scale than the plot scale in Mie; these results were more evident at sites with better ground cover. During the largest storms at both sites, differences in runoff due to forest condition were not evident regardless of scale. Dynamic soil moisture tension measurements at Nariki indicated that during a large storm, flow in the upper organic-rich and root-permeated soil horizons was 3.2 times higher than measured overland runoff from a small hinoki plot with poor ground cover and 8.3 times higher than runoff from a deciduous forest plot. On the basis of field observations during storms, at least a portion of the monitored 'Hortonian overland flow' was actually occurring in this near-surface 'biomat'. Therefore our field measurements in both small and large plots potentially included biomat flow in addition to short-lived Hortonian runoff. Because overland flow decreased with increasing scale, rill erosion did not occur on hillslopes. Additionally, runoff coefficients were not significantly different among cover conditions during large storms; thus, the 'degraded' forest conditions appear not to greatly enhance peak flows or erosion potential at larger scales, especially when biomat flow is significant. Copyright (C) 2007 John Wiley & Sons, Ltd.

    DOI: 10.1002/hyp.6876

    Web of Science

  77. Is MUSLE apt to small steeply reforested watershed?

    Sadeghi S. H. R., Mizuyama T., Miyata S., Gomi T., Kosugi K., Mizugaki S., Onda Y.

    JOURNAL OF FOREST RESEARCH   12 巻 ( 4 ) 頁: 270 - 277   2007年8月

  78. Surface runoff as affected by soil water repellency in a Japanese cypress forest 査読有り

    Shusuke Miyata, Ken'ichirou Kosugi, Takashi Gomi, Yuichi Onda, Takahisa Mizuyama

    HYDROLOGICAL PROCESSES   21 巻 ( 17 ) 頁: 2365 - 2376   2007年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JOHN WILEY & SONS LTD  

    Recent studies have suggested that soil water repellency can be one of the important factors affecting hydrological processes on headwater catchments. In Japan, water repellency is known to occur under Japanese cypress (Chamaecyparis obtusa) forests, a typical plantation type in Japan, however, previous studies have not evaluated the severity of water repellency and its effects on surface runoff generation. To quantify water repellency and its effects, this study combined the critical surface tension (CST) test with a new spraying experiment in which the infiltration rates of water and ethanol solutions sprayed over 0.09-m(2) plots were compared. Long-term intensive hydrological observations of surface runoff from 2-m(2) plots, soil water potential, and soil water content were conducted concurrently.
    The spraying experiment revealed that strong water repellency in surface soils, as quantified by the CST test, caused Hortonian overland flow despite the high conductivity measured under saturated hydrophilic conditions. Generally, the surface runoff coefficient for a storm event was negatively correlated with initial soil moisture conditions. However, during a period of successive storm events separated by short intervals, the coefficient decreased gradually even when the initial moisture conditions were similar. indicating a weakening of water repellency by repeated wetting. On the other hand, a drying period r with long inter-rainfall intervals and increasing air temperature was associated with increases in the surface runoff coefficient. These results suggest that the water repellency and the resultant surface runoff depended on the history of rainfall at the site. Relationships between soil water potential and soil water content indicate that changes in the soil water repellency and consequently surface runoff coefficient could occur during a single storm event. Copyright (c) 2007 John Wiley & Sons, Ltd.

    DOI: 10.1002/hyp.6749

    Web of Science

  79. Structures linking physical and biological processes in headwater streams of the maybeso watershed, southeast Alaska

    Mason D. Bryant, Takashi Gomi, Jack J. Piccolo

    FOREST SCIENCE   53 巻 ( 2 ) 頁: 371 - 383   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC AMER FORESTERS  

    We focus on headwater streams originating in the mountainous terrain of northern temperate rain forests. These streams rapidly descend from gradients greater than 20% to less than 5% in U-shaped glacial valleys. We use a set of studies on headwater streams in southeast Alaska to define headwater stream catchments, link physical and biological processes, and describe their significance within watersheds. We separate headwater stream systems into four units that have distinct hydrologic and geomorphic processes that link terrestrial processes to aquatic systems. Headwater streams collect, process, and transport material downstream. Physical and biological processes in headwater streams are complex and closely tied to terrestrial processes. Steps and step pools formed by large wood are keystone structures that link physical processes to biological processes and increase channel complexity. Large and coarse wood debris dams form in-channel step structures and act as valves that regulate the downstream flow of material. A large amount of inorganic and organic sediment is stored in step structures, which may be biological hotspots in headwater streams. Step pools formed by large woody debris are critical habitat for Dolly Varden (Salvelinus malma), juvenile coho salmon (Oncorhynchus kisutch), steelhead (O. mykiss), and cutthroat trout (O. clarkii) in reaches with gradients from less than 4% to those greater than 10%. Landslides and debris flows are the dominant channel-altering processes in headwater streams and remove the step profile. Management activities that increase the number and frequency of channel disturbance events in headwater streams can have important and long-term consequences throughout a watershed.

    Web of Science

  80. 河川上流と下流のつながり:上流管理の重要性 査読有り

    五味高志

    河川   729 巻   頁: 75 - 77   2007年2月

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    記述言語:日本語  

  81. JST/CRESTプロジェクト"森林荒廃が洪水・河川環境に及ぼす影響の解明とモデル化"研究サイト

    恩田,裕一, 五味,高志, 水垣,滋

    砂防学会誌   5 巻   頁: 70 - 73   2007年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

  82. Headwater stream temperature response to clear-cut harvesting with different riparian treatments, coastal British Columbia, Canada 査読有り

    Takashi Gomi, R. Dan Moore, Amod S. Dhakal

    WATER RESOURCES RESEARCH   42 巻 ( 8 ) 頁: 1 - 11   2006年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER GEOPHYSICAL UNION  

    [ 1] A 6-year study documented the effects of clear-cut harvesting with and without riparian buffers ( 10 m and 30 m wide) on headwater stream temperature in coastal British Columbia. The experiment involved a replicated paired catchment design. Pretreatment calibration relations between the treatment and control streams were fitted using time series of daily minimum, mean, and maximum temperatures. Generalized least squares (GLS) regression was used to account for autocorrelation in the residuals. While water temperature in streams with 10 and 30 m buffers did not exhibit marked warming, daily maximum temperature in summer increased by up to 2 degrees - 8 degrees C in the streams with no buffer. The effectiveness of the buffers may have been maximized by the north-south orientation of the streams, which meant that the streams would be well shaded from late morning to early afternoon by the overhead canopy, even under the 10 m buffer. The variation in response for the no-buffer treatments is consistent with the differences in channel morphology that influence their exposure to solar radiation and their depth. Relations between treatment effect and daily maximum air temperature suggested that recovery toward preharvest temperature conditions was occurring, with rates appearing to vary with stream and by season.

    DOI: 10.1029/2005WR004162

    Web of Science

  83. 土壌侵食と森林-森林斜面から流域の視点へ- 査読有り

    五味高志

    森林科学   47 巻   頁: 10 - 14   2006年6月

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    記述言語:日本語   出版者・発行元:日本森林学会  

    DOI: 10.11519/jjsk.47.0_10

    CiNii Books

  84. Factors affecting distribution of wood, detritus, and sediment in headwater streams draining managed young-growth red alder - conifer forests in southeast Alaska 査読有り

    Takashi Gomi, Adelaide C. Johnson, Robert L. Deal, Paul E. Hennon, Ewa H. Orlikowska, Mark S. Wipfli

    CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE   36 巻 ( 3 ) 頁: 725 - 737   2006年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS  

    Factors (riparian stand condition, management regimes, and channel properties) affecting distributions of wood, detritus (leaves and branches), and sediment were examined in headwater streams draining young-growth red alder (Alnus rubra Bong.) - conifer riparian forests (&lt; 40 years old) in southeast Alaska. More riparian red alder were found along streams affected by both timber harvesting and mass movement than in streams affected by timber harvesting alone. Young-growth stands produced little large wood material (diameter &gt;= 10 cm) and had little effect on altering the size distribution of functional large wood in channels, although more alder wood pieces were found in streams with greater numbers of riparian alder trees. Legacy wood pieces (&gt; 40 years old) remained in channels and provided sites for sediment and organic matter storage. Despite various alder-conifer mixtures and past harvesting effects, the abundance of large wood, fine wood, and detritus accumulations significantly decreased with increasing channel bank-full width ( 0.5-3.5 m) along relatively short channel distances (up to 700 m). Changes in wood, detritus, and sediment accumulations together with changes in riparian stand characteristics create spatial and temporal variability of in-channel conditions in headwater systems. A component of alder within young-growth riparian forests may benefit both wood production and biological recovery in disturbed headwater stream channels.

    DOI: 10.1139/X05-272

    Web of Science

  85. Sediment and wood accumulations in humid tropical headwater streams: Effects of logging and riparian buffers 査読有り

    T Gomi, RC Sidle, S Noguchi, JN Negishi, AR Nik, S Sasaki

    FOREST ECOLOGY AND MANAGEMENT   224 巻 ( 1-2 ) 頁: 166 - 175   2006年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The amount of sediment, wood, and detritus (leaves and small branches) accumulations were examined in four headwater tributaries subjected to different treatments (unlogged, logged with riparian buffer, and logged with no buffer) 16 and 40 months after timber harvesting in the Bukit Tarek Experimental Watershed, Peninsular Malaysia. Sediment transport from hillslope logging roads and skid trails resulted in large sediment storage in the stream channels. Riparian reserves appear to mitigate logging impacts to streams; however, more sediment was found in a tributary channel with a 20-m buffer than an unlogged channel because some of the nearby roads and skid trails were connected to the stream. Sediment storage in channels declined within 40 months after logging in catchments with and without riparian buffers. Vegetation recovery on skid trails and logging roads reduced both sediment supply and delivery. The volume of large wood was 1.5 to 2-times greater in the stream without riparian reserves than the stream of an unlogged catchment or in a stream with a riparian buffer. No consistent change in detritus accumulations was found among streams in 2001 and 2003, although more detritus was present in 2003 in all streams. The effects of logging and the effectiveness of riparian buffers appear to depend on the hydrologic connections between hillslopes and headwater streams. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.foreco.2005.12.016

    Web of Science

  86. Suspended sediment dynamics in small forest streams of the Pacific Northwest

    Gomi T, Moore RD, Hassan MA

    JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION   41 巻 ( 4 ) 頁: 877 - 898   2005年8月

     詳細を見る

  87. Thermal regime of a headwater stream within a clear-cut, coastal British Columbia, Canada 査読有り

    RD Moore, P Sutherland, T Gomi, A Dhakal

    HYDROLOGICAL PROCESSES   19 巻 ( 13 ) 頁: 2591 - 2608   2005年8月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JOHN WILEY & SONS LTD  

    This study examined the thermal regime of a headwater stream within a clear-cut. The stream had a complex morphology dominated by step-pool features, many formed by sediment accumulation upstream of woody debris. Maximum daily temperatures increased up to 5 degrees C after logging, and were positively associated with maximum daily air temperature and negatively with discharge. Maximum daily temperatures generally increased with downstream distance through the cut block, but decreased with distance in two segments over distances of tens of metres, where the topography indicated relatively concentrated lateral inflow. Localized cool areas within a step-pool unit were associated with zones of concentrated upwelling. Bed temperatures tended to be higher and have greater ranges in areas of downwelling flow into the bed. Heat budget estimates were made using meteorological measurements over the water surface and a model of net radiation using canopy characteristics derived from fisheye photography. Heat exchange driven by hyporheic flow through the channel step was a cooling effect during daytime, with a magnitude up to approximately 25% that of net radiation during the period of maximum daytime warming. Heat budget calculations in these headwater streams are complicated by the heterogeneity of incident solar radiation and channel geometry, as well as uncertainty in estimating heat and water exchanges between the stream and the subsurface via hyporheic exchange and heat conduction. Copyright (c) 2005 John Wiley & Sons, Ltd.

    DOI: 10.1002/hyp.5733

    Web of Science

  88. Hydrogeomorphic linkages of sediment transport in headwater streams, Maybeso Experimental Forest, southeast Alaska 査読有り

    T Gomi, RC Sidle, DN Swanston

    HYDROLOGICAL PROCESSES   18 巻 ( 4 ) 頁: 667 - 683   2004年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    Hydrogemorphic linkages related to sediment transport in headwater streams following basin wide clear-cut logging on Prince of Wales Island, southeast Alaska, were investigated. Landslides and debris flows transported sediment and woody debris in headwater tributaries in 1961, 1979, and 1993. Widespread landsliding in 1961 and 1993 was triggered by rainstonns with recurrence intervals (24 h precipitation) of 7.0 years and 4.2 years respectively. Occurrence. distribution, and downstream effects of these mass movements were controlled by landform characteristics such as channel gradient and valley configuration. Landslides and channelized debris flows created exposed bedrock reaches, log jams, fans, and abandoned channels. The terminus of the deposits did not enter main channels because debris flows spread and thinned on the unconfined bottom of the U-shaped glaciated valley. Chronic sediment input to channels included surface erosion of exposed till (rain splash, sheet erosion, and freeze-thaw action) and bank failures. Bedload sediment transport in a channel impacted by 1993 landslides and debris flows was two to ten times greater and relatively finer compared with bedload transport in a young alder riparian channel that had last experienced a landslide and debris flow in 1961. Sediment transport and storage were influenced by regeneration of riparian vegetation, storage behind recruited woody debris, development of a streambed armour layer, and the decoupling of hillslopes and channels. Both spatial and temporal variations of sediment movement and riparian condition are important factors in understanding material transport within headwaters and through channel networks. Copyright (C) 2004 John Wiley Sons, Ltd.

    DOI: 10.1002/hyp.1366

    Web of Science

  89. Bed load transport in managed steep-gradient headwater streams of southeastern Alaska

    Gomi T, Sidle RC

    WATER RESOURCES RESEARCH   39 巻 ( 12 )   2003年12月

  90. Characteristics of channel steps and reach morphology in headwater streams, southeast Alaska

    Gomi T, Sidle RC, Woodsmith RD, Bryant MD

    GEOMORPHOLOGY   51 巻 ( 1-3 ) 頁: 225 - 242   2003年3月

  91. Understanding processes and downstream linkages of headwater systems

    Gomi T, Sidle RC, Richardson JS

    BIOSCIENCE   52 巻 ( 10 ) 頁: 905 - 916   2002年10月

  92. The characteristics of woody debris and sediment accumulation in headwater streams, southeastern Alaska 査読有り

    Gomi T, Sidle, R.C, Bryant, M.D, Woodsmith, R.D

    Canadian Journal of Forest Research   31 巻   頁: 1386 - 1399   2002年8月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1139/cjfr-31-8-1386

▼全件表示

書籍等出版物 12

  1. 水資源対策としての森林管理 大規模モニタリングデータからの提言

    ( 担当: 共編者(共編著者))

    東京大学出版会  2022年12月  ( ISBN: 978-4-13-071107-4

     詳細を見る

    総ページ数:260   記述言語:日本語

  2. ほんとうのエコシステムってなに? 漁業・林業を知ると世界がわかる

    五味高志( 担当: 分担執筆 ,  範囲: 災害と森林との関係)

    農山村文化協会  2023年3月  ( ISBN:9784540221156

     詳細を見る

    総ページ数:162   担当ページ:110-113  

  3. 森林水文学入門

    五味高志( 担当: 分担執筆 ,  範囲: 流出解析)

    朝倉書店  2022年9月 

     詳細を見る

    総ページ数:245   担当ページ:145-162   記述言語:日本語 著書種別:教科書・概説・概論

  4. Sika Deer: Life History Plasticity and Management

    Takashi Gomi, Mitsuru Oohira, Marino Hiraoka, Shusuke Miyata, Yoshimi Uchiyama( 担当: 共著)

    2022年6月  ( ISBN:978-981-16-9553-7

     詳細を見る

    総ページ数:634   担当ページ:399-413   記述言語:英語 著書種別:学術書

    DOI: https://doi.org/10.1007/978-981-16-9554-4

  5. Impact s of Fukushima Nuclear Accident on freshwater environments 国際共著

    Fujino T, Jayasanka Senavirathna MDH, Sakai M, Gomi T( 担当: 分担執筆 ,  範囲: Characteristics of 137Cs Concentration and Radioactivity Transfer in Large Aquatic Insect Species)

    2021年11月  ( ISBN:978-981-16-3670-7

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    総ページ数:197   担当ページ:169-184   記述言語:英語 著書種別:学術書

    DOI: https://doi.org/10.1007/978-981-16-3671-4

  6. 森林林業実務必携

    五味高志( 担当: 分担執筆 ,  範囲: 山地防災と流域保全)

    岩波書店  2021年4月  ( ISBN:978-4-254-47057-4

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    総ページ数:504   担当ページ:133–158   記述言語:日本語 著書種別:学術書

  7. 森林学の百科事典

    五味高志( 担当: 分担執筆 ,  範囲: 森林における災害の歴史とその背景)

    丸善出版  2021年1月  ( ISBN:978-4-621-305843

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    総ページ数:694   記述言語:日本語 著書種別:事典・辞書

  8. 保持林業−木を伐りながら生き物を守る

    五味高志( 担当: 分担執筆 ,  範囲: カナダ・BC州の事例: 保持林業が渓流生態系に及ぼす影響)

    築地書館  2018年11月  ( ISBN:978-4-8067-1570-2

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    総ページ数:372   担当ページ:95–120   記述言語:日本語 著書種別:学術書

  9. 森林と災害

    五味高志, 戸田浩人, 境 優( 担当: 分担執筆 ,  範囲: 原子力災害がもたらす森林−渓流生態系の放射性セシウム汚染)

    共立出版  2018年3月  ( ISBN:9784320058194

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    総ページ数:248  

  10. Sustainable forest management: from concept to practice

    Moore RD, Sidle RC, Eaton B, Gomi T, Wilford D( 担当: 共著)

    Routledge  2017年9月 

     詳細を見る

    担当ページ:161-247   記述言語:英語 著書種別:学術書

  11. ヒノキ林流域と広葉樹林流域の降雨流出の違い(人工林荒廃と水・土砂流出の実態・恩田裕一編)

    恩田裕一, 水垣滋, 平松晋也, 寺嶋智巳, 五味高志( 担当: 共著)

    岩波書店  2008年10月  ( ISBN:9784000054638

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    担当ページ:73-85   記述言語:日本語 著書種別:学術書

  12. Compatible management of red alder-conifer ecosystems in Southeastern Alaska. Chapter 4 In Wood compatible initiative for future forest management

    Wipfli M.S, Hennon P.E, Deal R.L, Johnson, A.C, De Santo T.L, Gomi T, Edwards R.T, Bryant M.D, Schultz M.E, Orilowaska E.H, Lesage C. Kimbirauskus R, D’Amore D.V( 担当: 共著)

    Kluwer Academic Publishers  2003年10月 

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    担当ページ:55-84   記述言語:英語 著書種別:学術書

▼全件表示

MISC 5

  1. Seasonal variation in food web-based transfer factors of radiocesium in white-spotted char (Salvelinus leucomaenis) from headwater streams

    M. E. Haque, T. Gomi, M. Sakai, J. N. Negishi  

    Landscape and Ecological Engineering14 巻 ( 1 ) 頁: 45 - 53   2018年1月

     詳細を見る

    記述言語:英語   出版者・発行元:Springer Tokyo  

    The seasonal variability of food web-based transfer factors (TFweb) of radiocesium (137Cs) in white-spotted char (Salvelinus leucomaenis) was examined in the 2nd and 3rd year after the Fukushima Daiichi Nuclear Power Plant accident. Two headwater streams with similar landscape characteristics, but different amounts of fallout, were selected in Fukushima and Gunma Prefectures, Japan. The TFweb of predator–prey systems was based on the dietary contributions of prey items estimated from stable isotopes compared to their respective 137Cs activity concentrations. Char consumed more terrestrial food sources with higher contamination levels in summer than in winter based on their dietary-based 137Cs contributions. The TFweb values in Fukushima and Gunma in all seasons indicated 137Cs bioaccumulation from prey to predator. The TFweb in Gunma exhibited significant seasonal variation
    the greatest values were observed in winter, while the lowest values were observed in summer. In contrast, the seasonal TFweb in Fukushima did not vary seasonally. Despite similar consumption patterns and the specific metabolic rates of char, the different seasonal patterns of TFweb at the two sites can be explained by the relative excretion rate with respect to the concentration of 137Cs consumed. 137Cs levels can remain relatively constant in the char body throughout the year in areas with high contamination, such as Fukushima, possibly because 137Cs intake overwhelms the excretion rate. Examining seasonal patterns in the transfer processes of 137Cs in white-spotted char are essential for understanding mechanisms of 137Cs accumulation in aquatic biota.

    DOI: 10.1007/s11355-016-0324-4

    Scopus

  2. Characteristics of landslides in unwelded pyroclastic flow deposits, southern Kyushu, Japan

    M. Yamao, R. C. Sidle, T. Gomi, F. Imaizumi  

    NATURAL HAZARDS AND EARTH SYSTEM SCIENCES16 巻 ( 2 ) 頁: 617 - 627   2016年

     詳細を見る

    記述言語:英語   出版者・発行元:COPERNICUS GESELLSCHAFT MBH  

    We investigated 184 landslides that occurred in unwelded pyroclastic flow deposits (Shirasu) on southern Kyushu Island, Japan, that included detailed data on the rainfall characteristics and the timing of slope failure. Localized rainfall intensity, antecedent precipitation index (API), and topography affected the hydrologic processes that triggered landslides. API (adjusted for evapotranspiration losses) for large (&gt;200 mm) storms that triggered landslides was much lower than for smaller (&lt;= 200 mm) storms. Mean storm intensity and 7-day API (API7) thresholds of &gt;5mm h(-1) and &lt;= 30mm (or API(30) &lt;= 60 mm), respectively, were useful to identify landslides triggered by rapid pore water pressure response, especially for shorter (&lt;20 h) duration events. During smaller storms with lower intensity, landslides are likely affected by a combined increase in soil weight and loss of suction when API(30) &gt;= 150 mm; simulations indicated that these weight and suction changes due to rainfall accumulation decreased the factor of safety in steep Shirasu slopes, but did not necessarily trigger the landslides. Most of the landslides that were plotted below a general rainfall intensity-duration threshold for landslide initiation occurred during smaller storms with API(30) values &gt; 200 mm, indicating that they were highly influenced by the combined effects of the accumulated weight of rainfall and loss of suction. Our findings show that both event rainfall characteristics and API affect the hydrogeomorphic processes that trigger different types of landslides in Shirasu. This knowledge and the thresholds we have identified are useful for predicting the occurrence of different types of landslides in unwelded Shirasu deposits and improving sediment disaster prevention practices, including real-time warning systems.

    DOI: 10.5194/nhess-16-617-2016

    Web of Science

    Scopus

  3. The effect of strip thinning on tree transpiration in a Japanese cypress (Chamaecyparis obtusa Endl.) plantation

    Xinchao Sun, Yuichi Onda, Kyoichi Otsuki, Hiroaki Kato, Akiko Hirata, Takashi Gomi  

    AGRICULTURAL AND FOREST METEOROLOGY197 巻   頁: 123 - 135   2014年10月

     詳細を見る

    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    This study analyzes the effect of strip thinning on tree transpiration (E-t) in a dense and mature Japanese cypress (Chamaecyparis obtusa Endl.) plantation in central Japan. Strip thinning, which removed 50% of stems, was conducted in a headwater basin in October 2011. Xylem sap flow densities (F-d) were measured using thermal dissipation (Granier-type) sensors in a 156-m(2) plot before and after thinning. The canopy conductance (G(c)) was calculated on the basis of E-t values. The results revealed that the F-d at the outer xylem (0-20 mm) increased remarkably, whereas the F-d at the inner xylem (20-40 mm) had no significant change after thinning. Mean stand sap flow density (Is) values were higher in the post-thinning period than in the pre-thinning period, and the differences significantly increased with increasing vapor pressure deficit (VPD) values. Furthermore, the daily single tree E-t increased, particularly in the small tree class. Unlike the daily tree E-t, the daily stand E-t decreased from 1.29 +/- 0.60 to 1.00 +/- 0.40 mm d(-1) during the growing season or decreased from 1.23 +/- 0.48 to 0.74 +/- 0.42 mm d(-1) on the annual scale. The total stand E-t decreased by 23.0%, from 214.9 to 165.5 mm, during the growing season or decreased by 38.3%, from 441.0 to 272.1 mm, on the annual scale. G, decreased after thinning, which implies lower stand E-t and photosynthesis. G, was primarily related to the VPD and would be an effective model to predict E-t from these Japanese cypress plantations. This study provides useful information for understanding the E-t responses at individual tree and stand levels to strip thinning and contributes to obtaining a thorough understanding of the change in tree water use under different management strategies. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.agrformet.2014.06.011

    Web of Science

    Scopus

  4. 平成15年度 砂防学会ワークショップ助成(若手)成果報告山地森林域における水文・地形プロセスと生物プロセスの相互作用

    五味 高志, 布川 雅典, SIDLE Roy C.  

    砂防学会誌 : 新砂防 = Journal of the Japan Society of Erosion Control Engineering58 巻 ( 1 ) 頁: 72 - 73   2005年5月

     詳細を見る

    記述言語:日本語  

    CiNii Books

  5. Managing young upland forests in southeast Alaska for wood products, wildlife, aquatic resources, and fishes: Problem analysis and study plan

    Mark S. Wipfli, Robert L. Deal, Paul E. Hennon, Adelaide C. Johnson, Toni L. De Santo, Thomas A. Hanley, Mark E. Schultz, Mason D. Bryant, Richard T. Edwards, Ewa H. Orlikowska, Takashi Gomi  

    USDA Forest Service - General Technical Report PNW   頁: 1 - 46   2002年9月

     詳細を見る

    Red alder (Alnus rubra Bong.) appears to influence the productivity of young-growth conifer forests and affect the major resources (timber, wildlife, and fisheries) of forested ecosystems in southeast Alaska. We propose an integrated approach to understanding how alder influences trophic links and processes in young-growth ecosystems. The presence of red alder is expected to increase understory biomass, and aquatic, riparian, and terrestrial invertebrate abundance, providing more food for herbivores, fish, and birds. We predict that most red alder trees will die standing, and woody debris will be small and mobile in streams. Nitrogen fixation by red alder in mixed stands may result in larger, more commercially valuable conifers. Inclusion of red alder in the regenerating stand may therefore mitigate some negative impacts of clearcutting, and may increase total wood production from the landscape.

    Scopus

講演・口頭発表等 18

  1. 森と水のつながり:流域の中の森林を考える 招待有り

    五味高志

    令和4年度 小金井市成人大学講座  2022年9月3日  小金井市

     詳細を見る

    開催年月日: 2022年9月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:東京都小金井市   国名:日本国  

  2. 入れ子状流域観測による地下水涵養と間伐による流量変化の評価

    五味高志, Bui Xuan Dung, 恩田裕一

    森林水文ワークショップ「持続的な水供給に向けた森林管理よる資源涵養の上と地下利用技術開発」  2014年3月27日  森林水文ワークショップ

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大宮  

  3. 世界各地の大規模崩壊の発生分布・崩壊特性・規模

    五味高志, 平岡真合乃, 青戸一峰, 菊池京子

    平成26年度砂防学会研究発表会  2014年5月20日  砂防学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  4. シカ食害の顕著な東丹沢小流域における林床植生空間分布と表土侵食 招待有り

    五味高志, 坂上賢, 熊倉歩, 古市剛久, 内山佳美, 石川芳治

    平成23年度砂防学会研究発表会  2011年5月18日  (社)砂防学会

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:横浜  

  5. Storm runoff pathways in steep nested catchments draining a Japanese cypress forest in central Japan 招待有り

    Gomi T, Asano Y, Uchida T, Onda Y, Miyata S, Sidle R C, Kosugi K, Shigeru M, Fukuyama T, Fukushima T

    The Western Pacific Geophysics Meeting  2010年6月22日  American Geophysical Union (AGU)

     詳細を見る

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Taiwan  

  6. Hydrological response to strip thinning and catchment scales in Japanese headwater basin

    Dung BX, Gomi T, Onda Y, Kato H, Hiraoka M

    International symposium on sediment disasters under the influence of climate change and tectonic activity (3rd)  2013年9月26日  砂防学会

     詳細を見る

    記述言語:英語   会議種別:ポスター発表  

  7. How Much Understory Vegetation Matters for Evaluating Changes in Annual Runoff Due to Timber Harvesting?

    Takashi Gomi, Dung X.Bui, Yuichi Onda, Marino Hiraoka

    3rd International Conference on Forests and Water in a Changing Environment  2012年9月18日  Japan

     詳細を見る

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kyushu, Fukuoka  

  8. How dose confounding effects of thinning and floods affect benthic invertebrate communities in headwater streams of Japan? 招待有り

    Gomi T, Watanabe Y, Dung BX, Onda Y

    XXIV IUFRO World Congress 2014  2014年10月10日  IUFRO

     詳細を見る

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Salt Lake City, UT, United States  

  9. How did runoff and stream temperature responses after 50% thinning differ among nested observations of headwaters?

    Gomi T, Onda Y, Dung BW

    4th International Conference Forest & Water in a changing envrionment  2015年7月7日  IUFRO

     詳細を見る

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:BC, Canada  

  10. Field and modeling studies on the effects of forest devastation on flooding and environmental issues 招待有り

    Onda Y, Gomi T, Mizugaki S, Nanko K, Fukushima T

    The Western Pacific Geophysics Meeting  2010年6月22日  American Geophysical Union (AGU)

     詳細を見る

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Taiwan  

  11. Examining the Regional Legacy of Deep Catastrophic Landslides 招待有り

    Gomi T, Aoto K, Marino H, Ishizuka T, Uchida T

    Asia Oceania Geosciences Society (AOGS) 11th annual meeting  2014年7月30日  Asia Oceania Geosciences Society (AOGS)

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Sapporo, Hokkaido, Japan  

  12. Examining the occurrence ages of deep catastrophic landslides using tephrochronological approches

    Aoto I, Gomi T, Hiraoka M, Ishizuka T, Morita k, Isshiki H, Uchida T

    International symposium on sediment disasters under the influence of climate change and tectonic activity (3rd)  2013年9月26日  砂防学会

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    記述言語:英語   会議種別:ポスター発表  

    開催地:Kyoto  

  13. Estimating annual loss and annual evapotranspiration in forested headwater catchments: Analysis of the short-term water balance in pre- and post-thinning

    Sano K, Gomi T, Sato T, Hiraoka M, Onda Y

    4th International Conference on Forest and Water in a Changing Environment  2015年7月8日  IUFRO

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    記述言語:英語   会議種別:ポスター発表  

    開催地:BC, Canada  

  14. 入れ子状観測流域における列状間伐後の流量と水温応答:FM唐沢山の事例

    五味高志, 平岡真合乃, 大平充, 恩田裕一

    第127回日本森林学会  2016年3月27日  日本森林学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神奈川県藤沢市  

  15. 深層崩壊の発生頻度の推定方法検討:鰐塚山の事例 招待有り

    五味高志, 平岡真合乃, 山越隆雄, 横山修, 石塚忠範, 内田太郎, 南光一樹

    平成24年度砂防学会研究発表会  2012年5月24日  日本

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:高知  

  16. 平岡真合乃・五味高志・小田智基・宮田秀介・内山佳美

    丹沢山地大洞沢試験流域における土砂生産と流出, 斜面プロットと沈砂池の観測結果

    平成25年度砂防学会研究発表会  2013年5月30日  公益社団法人砂防学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:静岡市  

  17. 山地森林流域におけるイワナへの放射性セシウム蓄積量評価:摂食- 代謝解析

    五味高志, 境優, 岡田健吾, 岩本愛夢, 根岸淳二郎, 布川雅典

    応用生態工学会東京大会  2014年9月20日  応用生態工学会

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    記述言語:日本語   会議種別:ポスター発表  

  18. 山地上流域における放射性同位体核種を用いた細粒土砂起源の推定と流出プロセス 招待有り

    熊倉歩, 五味高志, 水垣滋, 石川芳治, 古市剛久, 宮田秀介, 内山佳美

    平成23年度砂防学会研究発表会  2011年5月18日  (社)砂防学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:横浜  

▼全件表示

科研費 15

  1. 気候変動下における流域森林の目標像の解明:治水と河川生態系保全の両立をめざして

    研究課題/研究課題番号:22H03796  2022年4月 - 2026年3月

    科学研究費助成事業  基盤研究(B)

    石山 信雄, 中田 康隆, 五味 高志, 飯塚 浩太郎, 中村 太士

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    担当区分:研究分担者 

    現地調査、河川環境および生物相に関するマクロデータセット、リモートセンシング技術を併用し、①流域の森林構造が河川の4大環境変動レジームに及ぼす影響を明らかにする。次に、②それらレジームが河川の生物多様性に及ぼす影響を把握する。最後に、将来気候を考慮したシナリオ分析を行い、③どのような気候、立地環境条件下でどのような流域の森林構造が環境変動レジームに影響し河川生物の多様性保全に寄与するか検証する。これにより、気候変動と様々な人工林管理の問題を抱える日本において、治水と河川生態系保全の両立に効果的な森林の目標像とその地域差を明らかにし、気候変動適応策の立案に資する科学的知見の提供を目指す。

  2. 福島の森林より放射性物質は今後も流出するのか?

    研究課題/研究課題番号:22H00556  2022年4月 - 2025年3月

    科学研究費助成事業  基盤研究(A)

    恩田 裕一, 五十嵐 康記, 五味 高志, 高橋 純子, 榊原 厚一, 谷口 圭輔, 加藤 弘亮

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    担当区分:研究分担者 

    福島原発事故によって福島に沈着したセシウムは,森林流域から流出しつつあるものの,河川水中の溶存態セシウム濃度は,チェルノブイリ影響河川よりも遙かに低いことがわかってきた。その理由として,渓流水と土壌,リター(落葉)との反応時間が長いほど,渓流水中のイオン総量(EC)が多いほどセシウムが溶脱しやすく,溶存態濃度が高くなる可能性が指摘されている。そこで,福島県の浪江地域において異なる地形勾配の調査流域を複数設け,斜面から河川,上流から下流へ流出するTravel timeとセシウム溶脱の関連性を把握する。そして,データ解析と現地観測より,河川中のCs-137濃度を推定する統合モデルを開発する。

  3. ポテンシャルに対応した多摩川河川敷の目標とする自然の変化と合意形成

    研究課題/研究課題番号:17H03960  2017年4月 - 2020年3月

    科学研究費助成事業  基盤研究(B)

    倉本 宣, 知花 武佳, 五味 高志, 伊東 静一, 岡田 久子, 金子 弥生

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    担当区分:研究分担者 

    多摩川の河川敷の潜在的な環境とその環境のつながりが、多摩川の河川敷の生物に及ぼしている影響を、保全生態学、砂防学、河川工学、陸水学を総合して明らかにした。大規模な出水が発生したので、その動的な側面の一部を解明した。出水によって一時的に礫河原が広がったものの、礫河原固有種は出水で激減したまま回復しなかった。自然科学的な成果に基づいて、パンフレットやワークショップによって社会的な合意を形成する実験を行ったところ、市民は研究者から教えてもらうことに熱心であり、成果を基に自分で考えて、合意形成することができる市民の割合は少ないことが判明した。さらなる社会的な合意形成のための手法の開発が必要である。
    河川敷という空間は、その場所での人間活動と、その上流側の流域の人間活動に加えて、河川工学や生態学の原理にしたがった潜在力を持っている。本研究では、その潜在力を総合的に明らかにしたうえで、流域のある自治体を中心に普及活動を繰り返し行って、社会的な合意形成を図る社会実験を行った。市民が主体的に河川敷のあり方を考えることは容易ではないものの考える市民が存在し、自治体や河川管理者が市民の合意を得ながら、流域全体を対象にして河川を取り扱っていくという方向性を示すことができた。

  4. ニホンジカの低密度過程における生態系レジリエンス機能の評価手法の検討

    研究課題/研究課題番号:16H02555  2016年4月 - 2020年3月

    科学研究費助成事業  基盤研究(A)

    梶 光一, 五味 高志, 小池 伸介, 伊吾田 宏正, 赤坂 宗光, 宇野 裕之, 吉田 剛司, 石川 芳治

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    担当区分:研究分担者 

    過採食によって植生が衰退した地域では落葉に依存してシカの高密度が維持されている。慢性的な過採食は、地上植生よりもシードバンク内の種数を早く減少させること、食糞性コガネムシの幼虫時の食性変化を通じて物質の循環機能・種子散布機能などに負の影響を及ぼす可能性など生態系への影響が示唆された。一方、シカの低密度下は、シカの体重と繁殖力の増加、稚樹の更新に対するシカの採食による負の直接効果とササ被度減少を通じた正の間接効果、林床植生被覆率の増加と土壌浸食量の減少をもたらせた。また、シカ柵設置場所の流域スケールでの位置が植生被覆・侵入に、光条件がシードバンクの存続に影響することが明らかになった。
    シカ類が世界規模で増加して自然生態系に強い影響を与えているが、シカと生息地の相互関係の定量的な研究や生態系機能に着目した研究は乏しい。ニホンジカの過採食によって劣化した自然生態系復元のために個体数管理が実施されているが、低密度化が過増加以前の健全な生態系回復をもたらすかについては不明であった。本研究は、長期モニタリングと生息密度の低減が実現している4地域(知床、阿寒、洞爺湖中島、丹沢)を対象に、低密度化による生態系への影響緩和のプロセスを明らかにし、過採食で劣化した生態系維持回復にむけた生態的指標の抽出と回復過程の把握、効果的なシカ柵の設置などを具体的に示した点に意義がある。

  5. 森林集水域における水・炭素循環統合解析による森林管理最適化システムの構築

    研究課題/研究課題番号:16H02556  2016年4月 - 2020年3月

    科学研究費助成事業  基盤研究(A)

    五味 高志, 恩田 裕一, 戸田 浩人, 白木 克繁, 山本 一清, 山浦 紘一, 石川 芳治

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    担当区分:研究代表者 

    配分額:39780000円 ( 直接経費:30600000円 、 間接経費:9180000円 )

    斜面から広域スケールにて、森林管理が材積量変化、林内環境や樹木活性変化による、水文プロセスと炭素循環を評価できた。斜面や小流域スケールでは、間伐による遮断や蒸散、林床植生による蒸発散量の評価を行うとともに、林床植生の生育による遮断量の変化を評価した。流域流出量から、間伐よる蒸散量や遮断の変化を評価し、従来の年単位から季節変動性も評価する手法を確立した。近年の土砂災害による流木流出は森林の炭素蓄積量に大きく影響を及ぼすことも評価した。森林簿の広域情報をを用い、水収支観測データが得られない流域も、立木密度や樹高などの森林状態と蒸発散の相関関係から、広域森林状態を考慮した水循環の評価手法を確立した。
    従来の小流域を中心とした観測結果を、広域拡張を可能とした点が学術的にも意義がある。これにより、広域の森林管理における水資源や炭素蓄積を考慮した森林計画にも寄与するとともに、近年の洪水災害対策や渇水対策における森林の取り扱い提言にも使える指標となった。カーボンやウォーター・フットプリントの評価では、水資源への費用対効果評価のみならず、近年多発する土砂災害に対応した水や炭素の動態把握が重要であり、今後の平常時や災害時における流域管理に発展する知見が得られた。さらに、森林環境税や民間企業の木材生産や木質バイオマス利用と水源涵養機能を関連させ、地域の積極的な森林事業展開や活性化を促すことができる。

  6. 森林小流域における放射性セシウムの移動・蓄積・流出を予測する林床有機物動態の解析

    研究課題/研究課題番号:15H04511  2015年4月 - 2018年3月

    科学研究費助成事業  基盤研究(B)

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    担当区分:研究分担者 

  7. 渓流水100mLでの森林窒素代謝評価:新安定同位体水質指標の開発と展開

    研究課題/研究課題番号:26252020  2014年4月 - 2017年3月

    科学研究費助成事業  基盤研究(A)

    木庭 啓介, 戸田 浩人, 大手 信人, 五味 高志, 勝山 正則, 徳地 直子, 柴田 英昭, 楊 宗興, 稲垣 善之, 舘野 隆之輔, 渡邊 未来

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    担当区分:研究分担者 

    森林集水域へ供給される硝酸性窒素および森林渓流水に溶存し森林より流出する硝酸性窒素について窒素酸素同位体比および酸素同位体比異常の測定を行い、既存の計算手法に改良を加えることで、日本と中国のさまざまな窒素沈着速度を持つ森林を対象に、総硝化速度そして脱窒速度を求めることができ、この結果はPNAS誌に掲載された。また、この結果から、森林においても、窒素除去効率の窒素不可に伴う低下がみとめられ、このことは、東アジアで窒素沈着が大きくなってゆくことを考えると、たいへん大きな問題となると考えられる。

  8. 過採食のもたらす植生とシカへのフィードバック効果:過採食の生態学的意義

    研究課題/研究課題番号:25292085  2013年4月 - 2017年3月

    科学研究費助成事業  基盤研究(B)

    梶 光一, 吉田 剛司, 五味 高志, 小池 伸介, 日浦 勉, 赤坂 宗光, 石川 幸男, 伊吾田 宏正, 高橋 裕史, 松浦 由紀子, 上野 真由美, 池田 敬, 竹下 和貴, 増田 泰, 東谷 宗光, 上原 裕世

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    担当区分:研究分担者 

    シカの慢性的な過採食はシカの体サイズの密度依存的な小型化のみならず、下層植生の減少により生態系にもさまざまな影響をもたらせている。すなわち林冠木が利用可能な窒素量が増加し、分解されやすい低いC/N比のリターを土壌に供給するというフィードバック、植生の種多様性、系統多様性の複雑な変化、開花フェノロジーの断絶によるマルハナバチの個体数の減少の示唆などである.昆虫類は、分類群及び機能群により、シカの高密度化に対する反応が異なっており、下層植生に依存し、過採食が食物資源や生息環境に負の影響を及ぼすと推測された。このことは、シカの過増加が将来的な生物群集の均質化を引き起こすことを示唆している。

  9. 森林‐農地移行帯における放射性核種の移動・滞留と生態系濃縮の評価

    研究課題/研究課題番号:24248058  2012年5月 - 2015年3月

    科学研究費助成事業   基盤研究(A)

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    担当区分:研究代表者  資金種別:競争的資金

  10. 流域圏水・物質循環モデルを用いた水稲用農薬の動態評価システムの開発

    研究課題/研究課題番号:24580352  2012年4月 - 2015年3月

    科学研究費助成事業  基盤研究(C)

    渡邊 裕純, 加藤 亮, 五味 高志, 斎藤 広隆, 稲生 圭哉

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    担当区分:研究分担者 

    本研究の目的は,農薬の環境影響評価や登録規制に用いる水稲用農薬の流域スケール動態評価システムの開発・検証である。
    平成24年度および平成25年度に行った研究では,まず流域スケールでの水稲用農薬の動態予測モデルシステム(PCPF-1@SWAT)の構築を行った。米国農務省で開発された流域スケール物質循環モデルに代表者が開発した農薬動態予測モデルを移植し,水田を含む集水域に適用可能なモデルを構築した。茨城県桜川流域でのモニタリング調査データを用い検証を行った。次に カリフォルニアの水田環境現地調査を行い,カリフォルニア水田シナリオでの農薬動態予測を行った。

  11. 森林生態系における放射性核種と有機物・土壌養分の物質循環的解析

    研究課題/研究課題番号:24380076  2012年4月 - 2015年3月

    科学研究費助成事業  基盤研究(B)

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    担当区分:研究分担者 

  12. 山地河道の水理特性の時空間分布解明

    研究課題/研究課題番号:23380081  2011年4月 - 2014年3月

    科学研究費助成事業  基盤研究(B)

    浅野 友子, 内田 太郎, 五味 高志

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    担当区分:研究分担者 

    気候変動により日本では豪雨の増加による洪水の規模や頻度の増加が懸念され、国土の60%以上占める山地域での土石流など、急激な水・土砂の流出メカニズムを理解し予測する必要がある。そこで、本研究では、A) 山地河道での洪水時の流量、水深、流速データの取得、B) 洪水時の山地河道の水理特性と河道形状の関係の解明を行なった。山地河道では洪水時に水深が急激に大きく増加する一方,流速はそれほど大きくならないこと、水理特性は平水時にはステップ部やプール部など河道区間により異なるが、豪雨時には河道全体の形状に依存するようになることを示した。グリーンレーザを用いた水面下も含む新たな3D測量技術の開発を行なった。

  13. 中央アジアの乾燥地での大規模灌漑農業による環境汚染の拡大と生態系への影響

    研究課題/研究課題番号:20405004  2008年 - 2011年

    科学研究費助成事業  基盤研究(B)

    川端 良子, 片山 幸士, 長井 正博, 山本 政儀, 山田 祐彰, 五味 高志

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    担当区分:連携研究者 

    中央アジア・ウズベキスタン共和国内のヌクスを中心としたアムダリア流域にて,大規模灌漑農業による環境汚染と生態系への影響について以下の調査を行った. 1)飲料水である地下水の調査を行った. 2)潅漑用水,潅漑排水,および河川水を採取し,灌漑農業による河川水への影響を調査した. 3)ヌクス近郊の農村で,人体への影響に関しての聞き取り調査を行った. 4)河川水と地下水を毎月試料採取し,月変動を調査した
    その結果、地下水の元素濃度の方が、河川水より高い濃度であった。さらに、冬場に、特に、地下水の硝酸イオン濃度が高くなっていることが明らかとなった。また、ヌクスの郊外の農村で,縞状の歯を持つ子供たちが多くみられ過去に何らかのエナメル質を溶かすような有毒な物質が,井戸水に含まれていた可能性が高いことがわかった.そこで,月変動を明らかにすることと,一時的な汚染であれば,どのような時期に汚染されているかを調べるために,毎月この村で地下水の試料を採取することにした.その結果、地下水の元素濃度の方が、河川水より高い濃度であった。さらに、冬場に、特に、地下水の硝酸イオン濃度が高くなっていることが明らかとなったしかし、濃度変化は、年度によって差があり、さらに詳しく調べる必要があることが明らかとなった

  14. 森林路網からの水流出が流域の洪水流出に与える影響の評価とモデル化

    研究課題/研究課題番号:20580151  2008年 - 2010年

    科学研究費助成事業  基盤研究(C)

    五味 高志, ロイ サイドル

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    担当区分:研究代表者 

    配分額:4810000円 ( 直接経費:3700000円 、 間接経費:1110000円 )

    森林路面での浸透能測定の結果、林道における浸透能は平均33.3mm/hと林内に比べて低く、かつばらつきも小さいことか解明できた。土壌硬度や土壌密度が小さく、空隙率が大きい路面ほど浸透能が有意に高くなる傾向が見られた。林道プロットでの流出量を観測した結果、プロット流出から算出した最大浸透能は尾根地形のプロットが一番高くなっていた。路面流出への遮断中間流が全流出量に大きな割合を占めることが分かった。地形や水文条件等を加味しながら、林道の流出特性も流域の水流出モデルに組み込むことが可能であることが解明できた。

  15. 生態系許容限界密度指標を用いた自然公園の管理手法の開発

    研究課題/研究課題番号:20310142  2008年 - 2010年

    科学研究費助成事業  基盤研究(B)

    石川 芳治, 梶 光一, 土屋 俊幸, 福島 司, 星野 義延, 吉川 正人, 酒井 憲司, 戸田 浩人, 岩岡 正博, 崔 東寿, 渡辺 直明, 白木 克繁, 五味 高志, 小金澤 正昭

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    担当区分:研究分担者 

    林床植生(種の変化、密度、開花率、ササのかん高、ササの密度)、生物・化学(土壌小動物、土壌呼吸量、土壌有機物量)、物理・侵食(林床合計被覆率、土壌侵食量)、林業被害(皮剥)等の指標について、生態系への影響度を評価するためのレベル(大、中、小、微小)および許容限界を設定した。この生態系許容限界密度指標を用いることにより、自然公園におけるシカの密度管理を適正に行うことができる。

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担当経験のある科目 (本学) 2

  1. 生物圏環境学

    2022

  2. 森林環境学特論

    2022

担当経験のある科目 (本学以外) 17

  1. リモートセンシング論

    2008年4月 - 2022年9月 東京農工大学)

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    科目区分:学部専門科目  国名:日本国

  2. Forest Ecology and Management

    2015年10月 - 2022年3月 Tokyo Gakugei University)

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    科目区分:学部専門科目  国名:日本国

  3. 山地保全学

    2008年4月 - 現在 東京農工大学)

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    科目区分:学部専門科目  国名:日本国

  4. 地域環境計画学

    2008年4月 - 2018年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

  5. 国際イノベーション農学概論Ⅰ

    2019年4月 - 2022年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

  6. 論文レビュー特別演習Ⅰ〜Ⅱ

    2019年4月 - 2022年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

  7. 農学特別演習Ⅰ〜Ⅱ

    2019年4月 - 2022年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

  8. 農学展開研究Ⅰ〜Ⅱ

    2019年4月 - 2022年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

  9. 農学特別演習Ⅰ

    2019年4月 - 2022年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

  10. 農学特別研究Ⅰ

    2019年4月 - 2022年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

  11. 21世紀農学特論

    2019年4月 - 2022年9月 東京農工大学)

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    国名:日本国

  12. 地域生態システム学Ⅰ

    2015年4月 - 2022年9月 東京農工大学)

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    科目区分:学部専門科目  国名:日本国

  13. 河川生態論

    2009年10月 - 2015年3月 東京農工大学)

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    科目区分:学部専門科目  国名:日本国

  14. 山地保全砂防実習

    2009年4月 - 2022年9月 東京農工大学)

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    科目区分:学部専門科目  国名:日本国

  15. フィールド/ラボ安全管理と研究倫理

    2009年4月 - 2022年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

  16. 国際環境農学概論

    2008年10月 - 2021年3月 東京農工大学)

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    科目区分:学部専門科目  国名:日本国

  17. 国際環境農学課題別演習

    2008年4月 - 2018年9月 東京農工大学)

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    科目区分:大学院専門科目  国名:日本国

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