Faculty Profiles - SHIRAKAWA, Hiroaki

Papers - SHIRAKAWA, Hiroaki

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GIS を用いた同一性判定に基づく建築物のLCA 環境負荷の評価

太田裕也, 吉田英立, 白川博章, 谷川寛樹

環境情報科学 Vol. 51 ( 1 ) page： 117 - 117 2022.3

名古屋市中心部における建設資材ストックと構造種割合の変遷

玉崎美結, 白川博章, 谷川寛樹

環境情報科学 Vol. 51 ( 1 ) page： 83 - 83 2022.3

衛星画像を用いた畳み込みニューラルネットワークによる建物延床面積推計に関する研究

齋藤隆成, LIU Zhiwei, 平井千津子, 芳賀智宏, 松井孝典, 白川博章, 谷川寛樹

環境情報科学 Vol. 51 ( 1 ) page： 84 - 84 2022.3

都市構造物ストック推計手法の再検討

松代竜毅, 山下奈穂, 白川博章, 谷川寛樹

環境情報科学 Vol. 51 ( 1 ) page： 82 - 82 2022.3

Estimation of Material Stocks Based on Building Structure Determination Using Image Recognition

NAGAO Masahiro, TAKEUCHI Junki, TAMASAKI Miyu, MORITA Masato, KITA Eisuke, SHIRAKAWA Hiroaki, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 78 ( 6 ) page： II_19 - II_25 2022

Language：Japanese Publisher：Japan Society of Civil Engineers

Estimation of material stock of buildings in urban areas is important for recycling and proper disposal of resources. For the purpose of more accurate stock estimation, glasses and walls were extracted from images of building walls using a machine learning model of image recognition, and then calculated the percentage of glass in the walls based on the number of pixels in each. The classification of building structures based on the glass percentage showed that a threshold value of 67% is suitable for classifying steel-framed buildings with curtain walls. Classification result obtained from 262 buildings around Nagoya Station was used for stock estimation, and the result was compared with those calculated by the method proposed by previous study. The estimated amount of concrete decreased by 18% and the estimated amount of steel increased by 325%.

DOI： 10.2208/jscejer.78.6_ii_19

CiNii Research

Compilation of Physical Input Output Table of Non-metallic Mineral Resources in Japan and Application to Material Flow Indicators

YAMASHITA Naho, HASHIMOTO Seiji, SHIRAKAWA Hiroaki, TANIKAWA Hiroki

Journal of Human and Environmental Symbiosis Vol. 38 ( 2 ) page： 176 - 187 2021.11

Language：Japanese Publisher：Japan Association for Human and Environmental Symbiosis

The 4th Fundamental Plan for Establishing a Sound Material-Cycle Society aims to achieve exhaustive resource use though the development of new methods and indicators considering all stages of material lifecycle. In this study, material flow and stock analysis of non-metallic mineral resources and its compilation to physical input output table are conducted for the period 1990 to 2015. Also, the results are applied to 6 material flow indicators to discuss the efficiency in each stage of lifecycle. According to the results, the amount of direct material input has decreased since 1990, while the amount of domestic processed output has relatively increased in recent years. It was also found the recovery rate of used products has been over 90% since 2003. This indicates the utilization of used materials has been consistently promoted although the amount of outflow from used products has increased. The difference between the amount of outflow from statistics and estimates implies that there is a certain amount of so-called missing stock such as obsolete stock and dissipated stock. These stocks could be great concern in terms of its impact on material use time and future waste generation.

DOI： 10.32313/jahes.38.2_176

CiNii Research

物質ストックを考慮した資源生産性の要因分解の実証研究―住宅におけるケーススタディ― Invited Reviewed

山下奈穂, 郭静, 白川博章, 谷川寛樹

環境システム研究論文集 2021.10

The Comparative Study of Adaptation Measure to Sea Level Rise in Thailand

Ritphring Sompratana, Nidhinarangkoon Pattrakorn, Udo Keiko, Shirakawa Hiroaki

JOURNAL OF MARINE SCIENCE AND ENGINEERING Vol. 9 ( 6 ) 2021.6

A review of climate-change impact and adaptation studies for the water sector in Thailand

Kiguchi Masashi, Takata Kumiko, Hanasaki Naota, Archevarahuprok Boonlert, Champathong Adisorn, Ikoma Eiji, Jaikaeo Chaiporn, Kaewrueng Sudsaisin, Kanae Shinjiro, Kazama So, Kuraji Koichiro, Matsumoto Kyoko, Nakamura Shinichiro, Nguyen-Le Dzung, Noda Keigo, Piamsa-Nga Napaporn, Raksapatcharawong Mongkol, Rangsiwanichpong Prem, Ritphring Sompratana, Shirakawa Hiroaki, Somphong Chatuphorn, Srisutham Mallika, Suanburi Desell, Suanpaga Weerakaset, Tebakari Taichi, Trisurat Yongyut, Udo Keiko, Wongsa Sanit, Yamada Tomohito, Yoshida Koshi, Kiatiwat Thanya, Oki Taikan

ENVIRONMENTAL RESEARCH LETTERS Vol. 16 ( 2 ) 2021.2

EMPIRICAL RESEARCH OF RESOURCE PRODUCTIVITY DECOMPOSITION CONSIDERING MATERIAL STOCK -CASE STUDY OF JAPAN’S RESIDENTIAL BUILDINGS-

YAMASHITA Naho, GUO Jing, SHIRAKAWA Hiroaki, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 77 ( 6 ) page： II_23 - II_31 2021

Language：Japanese Publisher：Japan Society of Civil Engineers

Resource productivity is a material flow index that is set as a major goal of the Fundamental Plan for Establishing a Sound Material-Cycle Society, but it could not well evaluate the indirect impact of the material stock that supports the material flow. A few of existing studies have conducted the resource productivity decomposition with material stock factors though, it is difficult to apply the same fashion to all types of material stock whose value greatly varies depending on its usage. In this study, we mainly considered the factors of Japan’s housing material stock, to clarify the impact of changes in housing stock on the resource productivity. The results show that the resource productivity is negatively impacted by the decrease of the service provided with a unit of housing stock and the increase of vacant houses from 2008 to 2017, while it can be improved through the prolonging the housing lifetime.

DOI： 10.2208/jscejer.77.6_ii_23

CiNii Research

衛星夜間光情報に基づく深層学習による建築物の延べ床面積推計に関する研究 Reviewed

齋藤隆成,平井千津子,芳賀智宏,松井孝典,白川博章,谷川寛樹

環境システム研究論文集 Vol. 76 ( 6 ) page： 1 - 7 2020.10

Beach Nourishment as an Adaptation to Future Sandy Beach Loss Owing to Sea-Level Rise in Thailand

Somphong Chatuphorn, Udo Keiko, Ritphring Sompratana, Shirakawa Hiroaki

JOURNAL OF MARINE SCIENCE AND ENGINEERING Vol. 8 ( 9 ) 2020.9

A STUDY ON THE EFFECTS OF LAND USE CHANGE ON FLOODING RISKS IN NIGERIA

Ighile Eseosa Halima, Shirakawa Hiroaki

GEOGRAPHIA TECHNICA Vol. 15 ( 1 ) page： 91-101 2020.3

QUANTIFICATION OF IN-USE MATERIAL STOCK RATE - CASE STUDY OF JAPAN’S RESIDENTIAL BUILDINGS -

TANIKAWA Hiroki, YAMAMOTO Hiromu, YAMASHITA Naho, SHIRAKAWA Hiroaki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 76 ( 6 ) page： II_9 - II_16 2020

Language：Japanese Publisher：Japan Society of Civil Engineers

For the establishment of Recycling-based Society, Stock-type Society becomes increasingly important. Material stock plays an important role in the society and serves someone well in one way, whereas it has inevitable impact on material flow. For the reason that material stock is inextricably linked with material flow, the excess material stock can induce unnecessary resource input and increase waste generation from obsolete stock. To bring down high-quality material stock for the future generation, proper management of materials stored or hibernating in the society is required. In order to grasp the status of stock, material stock should be estimated and evaluated with in-use rate. In this study, by the method of lifespan modeling approach, material stock in Japan’s residential buildings and the amount of that obsolete stock/in-use stock were estimated. As a result of the estimation, there were 5.2 billion tons of residential building in 2018. In the amount of material stock in empty houses out of residential buildings, the amount of obsolete stock was estimated at 0.3 billion ton. As the number of residential building keeps increasing, the amount of obsolete stock is expected to increase in future.

DOI： 10.2208/jscejer.76.6_ii_9

CiNii Research

Land-Use/Land-Cover Change from Socio-Economic Drivers and Their Impact on Biodiversity in Nan Province, Thailand

Trisurat Yongyut, Shirakawa Hiroaki, Johnston John M.

SUSTAINABILITY Vol. 11 ( 3 ) 2019.2

Adaptation assessment to future beach loss due to sea level rise in Thailand

Chatuphorn Somphong, Keiko Udo, Sompratana Ritphring, Hiroaki Shirakawa, So Kazama

Proceedings of the Coastal Engineering Conference Vol. 36 ( 2018 ) 2018

Effect of Land Use Change Driven by Economic Growth on Sedimentation in River Reach in Southeast Asia - A Case Study in Upper Citarum River Basin -

Noda Keigo, Yoshida Koshi, Shirakawa Hiroaki, Surahman Usep, Oki Kazuo

JOURNAL OF AGRICULTURAL METEOROLOGY Vol. 73 ( 1 ) page： 22-30 2017.1

Quantitative Evaluation of Spatial Distribution of Nitrogen Loading in the Citarum River Basin, Indonesia

Yoshida Koshi, Tanaka Kenji, Noda Keigo, Homma Koki, Maki Masayasu, Hongo Chiharu, Shirakawa Hiroaki, Oki Kazuo

JOURNAL OF AGRICULTURAL METEOROLOGY Vol. 73 ( 1 ) page： 31-44 2017.1

Quantitative evaluation of spatial distribution of nitrogen loading in the Citarum river Basin, Indonesia Reviewed

Koshi Yoshida,Kenji Tanaka, Keigo Noda, Koki Homma, Masayasu Maki, Chiharu Hongo, Hiroaki Shirakawa and Kazuo Oki

Journal of agricultural meteology Vol. 73 ( 1 ) page： 31-44 2017

POSSIBILITY OF WEATHER-INDEX INSURANCE FOR CLIMATE CHANGE ADAPTATION IN NORTHEAST THAILAND

YOSHIDA Koshi, HOMMA Koki, MAKI Masayasu, NODA Keigo, SHIRAKAWA Hiroaki, OKI Kazuo, SRITUMBOON Supranee, SRISUTHAM Mallika

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 73 ( 5 ) page： I_377 - I_383 2017

Language：Japanese Publisher：Japan Society of Civil Engineers

In northeast Thailand, the ratio of irrigated agricultural land was only 7.6% and others were rain-fed so that climate change makes agricultural production more unstable and also makes crucial damage to the societies and economics in rural area. To mitigate these issues, it is desirable to develop and disseminate enhanced adaptation systems. In this study, we focused on weather-index insurance for climate change adaptation measure. Firstly, we evaluated how affect the rainfall amount and patterns on rice production through regression analysis by using the meteorological and agricultural statistic data from 1985 until 2004. The production of wet season rice had positive relationship(R>0.2, Slope>0.2) with 3 month accumulated rainfall (Jun-Aug) in 11 province. As a result, employed rainfall index was suitable for accurate estimation of rice production in wet season. Secondly, household survey was conducted to grasp farmer's conditions of water use, cultivation, income balance. And then, economic loss by weather induced agricultural damage was estimated and impact on farmer's household income was evaluated by using the agricultural statistic and rice price data from 1981 until 2013. Recently, agricultural economic loss of around 600 million Baht was often occurred in northeast Thailand. However farmers household income was mostly rely on non-agricultural sector so that agricultural economic loss was less than 10% of their annual income. Current weather index was designed by 5-10 years return periods in many province and that also might be the one reason of obstacles of insurance sales.

DOI： 10.2208/jscejer.73.i_377

CiNii Research

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Papers - SHIRAKAWA, Hiroaki