Updated on 2022/03/25

写真a

 
CHO Yonghwan
 
Organization
Graduate School of Engineering Civil and Environmental Engineering 2 Designated lecturer
Title
Designated lecturer
Contact information
メールアドレス

Degree 1

  1. Doctor(Engineering) ( 2014.9   Nagoya University ) 

Research Interests 7

  1. mixed soil transport

  2. Wave power generation

  3. coastal structure

  4. cohesive force

  5. sediment transport

  6. topographic change

  7. tidal flat

Research Areas 2

  1. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Hydroengineering  / Coastal engineering

  2. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Disaster prevention engineering  / Disaster prevention engineering

Current Research Project and SDGs 5

  1. 粘土流失特性を考慮した混合土砂モデルの改良と砂礫の漂砂計算への拡張

  2. 混合土砂漂砂モデルの拡張および砕波帯における粘土の流失による粘土/砂層の分離メカニズムの数値的一考察

  3. 津波来襲時の海岸堤防の被災メカニズム解明のための数値解析技術の開発

  4. 海岸・海底地形変化特性に必要である粘着力を考慮した混合土砂数値モデルの開発

  5. 規則波における反射壁を活用した下部ヒンジ型WECのパラメトリック設計に向けた基礎実験と波エネルギーの吸収能力向上させる新型WECの提案

Research History 3

  1. Gifu National College of Technology   Lecturer

    2019.11 - 2020.3

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    Country:Japan

  2. Nagoya University   Assistant Professor

    2015.4

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    Country:Japan

  3. Nagoya University   Researcher

    2014.10 - 2015.3

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    Country:Japan

Education 1

  1. Nagoya University   Graduate School, Division of Engineering

    2011.10 - 2014.9

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    Country: Japan

Professional Memberships 1

  1. 日本土木学会

Committee Memberships 2

  1. 土木学会中部支部優秀研究発表賞専攻委員会   委員  

    2017.9 - 2019.3   

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    Committee type:Academic society

  2. 土木学会海岸工学委員会地域研究活性化小委員会東海における防災及び環境研究WG   委員  

    2017.2   

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    Committee type:Academic society

Awards 2

  1. 優秀講演者

    2016.11   平成28年度土木学会全国大会第71回年次学術講演会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  2. Best Paper Award

    2013.9   7th International Conference on Asian and Pacific Coasts  

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    Award type:Award from international society, conference, symposium, etc.  Country:Indonesia

 

Papers 58

  1. Nonlinear hydrodynamic analysis and optimization of oscillating wave surge converters under irregular waves Reviewed International journal

    Ocean Engineering   Vol. 250 ( 15 )   2022.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.oceaneng.2022.110888

    Scopus

  2. Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter Reviewed International journal

    Liu Yao, Cho Yong-Hwan, Mizutani Norimi, Nakamura Tomoaki

    JOURNAL OF MARINE SCIENCE AND ENGINEERING   Vol. 10 ( 1 )   2022.1

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/jmse10010002

    Web of Science

    Scopus

  3. Numerical Reproducibility of Wave Response for an Oscillating Wave Surge Converter Using Inverted Triangle Flap Reviewed International coauthorship International journal

    Kim, T.-G, Kim, D.-S., Cho, Y.-H., Lee, K.-H.

    Journal of Korean Society of Coastal and Ocean Engineers   Vol. 33 ( 5 ) page: 203 - 216   2021.10

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    Language:Korean   Publishing type:Research paper (scientific journal)  

    Analyzing various wave interactions with oscillating wave surge converters (OWSC) is essential because they must be operated efficiently under a wide range of wave conditions and designed to extract optimal wave energy. In the conceptual design and development stage of OWSC, numerical analysis can be a good alternative as a design tool. This study performed a numerical analysis on the behavioral characteristics of the inverted triangle flap against the incident waves using open source CFD to examine the essential behavioral attributes of OWSC. Specifically, the behavioral characteristics of the structure were studied by calculating the free water surface displacement and the flap rotation angle near the inverted triangular flap according to the change of the period under the regular wave conditions. By comparing and examining the numerical analysis results with the hydraulic model experiments, the validity of the analysis performed and the applicability in analyzing the wave-structure interactions related to OWSC was verified. The numerical analysis result confirmed that the hydrodynamic behavior characteristic due to the interactions of the wave and the inverted triangle flap was well reproduced.

    DOI: 10.9765/KSCOE.2021.33.5.203

  4. Simple Breaker Index Formula Using Linear Model Reviewed International coauthorship International journal

    Lee Kwang-Ho, Cho Yong-Hwan

    JOURNAL OF MARINE SCIENCE AND ENGINEERING   Vol. 9 ( 7 ) page: 731   2021.7

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    Breaking waves generated by wave shoaling in coastal areas have a close relationship with various physical phenomena in coastal regions. Therefore, it is crucial to accurately predict breaker indexes such as breaking wave height and breaking depth when designing coastal structures. Many studies on wave breaking have been carried out, and many experimental data have been documented. Representative studies on wave breaking provide many empirical formulas for the prediction of breaking index, mainly through hydraulic model experiments. However, the existing empirical formulas for breaking index determine the coefficients of the assumed equation through statistical analysis of data under the assumption of a specific equation. This study presents an alternative method to estimate breaker index using representative linear-based supervised machine learning algorithms that show high predictive performance in various research fields related to regression or classification problems. Based on the used machine learning methods, a new simple linear equation for the prediction of breaker index is presented. The newly proposed breaker index formula showed similar predictive performance compared to the existing empirical formula, although it was a simple linear equation.

    DOI: 10.3390/jmse9070731

    Web of Science

    Scopus

    Other Link: https://www.mdpi.com/2077-1312/9/7/731

  5. Development of Numerical Model for Mixed Soil Problems Using Dry Bulk Density and Investigation of Its Numerical Stability Reviewed International coauthorship International journal

    Journal of Korean Society of Coastal and Ocean Engineers   Vol. 33 ( 3 ) page: 110 - 121   2021.6

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    Authorship:Lead author, Last author   Language:Korean   Publishing type:Research paper (scientific journal)  

    DOI: 10.9765/KSCOE.2021.33.3.110

  6. An Experimental Study of a Bottom-Hinged Wave Energy Converter with a Reflection Wall in Regular Waves-Focusing on Behavioral Characteristics Reviewed International coauthorship International journal

    Cho Yong-Hwan, Nakamura Tomoaki, Mizutani Norimi, Lee Kwang-Ho

    Applied Sciences   Vol. 10 ( 19 ) page: 1 - 23   2020.10

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    Authorship:Lead author, Last author   Language:English   Publishing type:Research paper (scientific journal)  

    The hybrid system of wave energy converters (WECs) using coastal structures is an attractive issue in terms of a decrease in construction costs and an improvement of the ability to capture wave energy. Most studies on the utilization of reflected waves from structures, which is one of the hybrid systems, are limited to mathematical analysis based on linear theories. Therefore, this paper presents fundamental experimental results in the presence of a reflection wall simplified as a coastal structure behind a bottom-hinged flap-type WEC under unidirectional regular waves. The behavioral characteristics and the power generation efficiency ke of the flap were investigated, focusing on wave steepness, initial water depth, and distance from the reflection wall. The results show that the condition of the initial water depth being smaller than the flap height is more effective in terms of avoiding unstable rotating of the flap. The maximum ke appeared slightly far from the node position of the standing waves because the flap shape and the power take-off (PTO) damping induce the phase difference between the reciprocating behavior of the flap and the period of the standing wave. The results imply that the optimum position of a WEC is dependent on WEC shape, PTO damping, and installation water depth.

    DOI: 10.3390/app10196734

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    Scopus

    Other Link: https://www.mdpi.com/2076-3417/10/19/6734

  7. MORPHOLOGICAL EVOLUTION OF CLAY/SAND MIXTURE FOCUSING ON CLAY LOSS Reviewed International journal

    PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ASIAN AND PACIFIC COASTS, APAC 2019     page: 593 - 599   2019.9

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:APAC 2019 - Proceedings of the 10th International Conference on Asian and Pacific Coasts  

    This study presents the characteristics of morphological evolution of clay/sand mixture and pure sand focusing on the clay loss on the surface layers under regular wave conditions. Hydraulic experiments were carried out using two-dimensional wave flume. Two different wave heights, 0.04 m and 0.07 m, with a wave period of 1.0 s were adopted. The movable beds consisted of silica sand (d50 = 0.439 mm) and kaolin (d50 = 8.0 µm) with the three different clay fractions, 0.0, 0.05 and 0.20. Regular waves were generated for more than 40 hours. Initial and final topography were measured with laser displacement meter and topographic change during experiments was estimated using the video taken with the camera on the side of the wave flume by means of image processing. In each case, the sediments were collected at the locations where the noticeable topographic changes occurred, and the change in clay fractions was examined. As a result, the higher the clay fraction, the smaller the initial topographic change. Over time, however, the similar morphological evolution of pure sand, such as sand ripples, was observed in the clay/sand mixture. The layer separation near the surface due to clay loss contributes to making the sand easier to move, thus separating surface layers into the clay-free layer (sand layer) over time implies an important factor in evaluating mixed soil transport.

    DOI: 10.1007/978-981-15-0291-0_82

    Web of Science

    Scopus

  8. Failure Mechanism of Armor Blocks of Submerged Breakwater Reviewed International journal

    Cho Y., Zhang C., Nakamura T., Mizutani N.

    Journal of Coastal Research   Vol. 85   page: 1166 - 1170   2018.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Coastal Research  

    DOI: 10.2112/SI85-234.1

    Scopus

  9. Mechanism of tsunami-induced erosion of bridge-abutment backfill and its countermeasures Reviewed International journal

    Nakamura Tomoaki, Sugiyama Chisato, Cho Yong-Hwan, Mizutani Norimi

    WATER   Vol. 13 ( 24 )   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/w13243529

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    Scopus

    Other Link: https://www.mdpi.com/2073-4441/13/24/3529

  10. Motion of floating caisson with extended bottom slab under regular and irregular waves Reviewed International journal

    Nakamura, T., Nagayama, N., Cho, Y.-H., Mizutani, N., Kurahara, Y., Takeda, M.

    Journal of Marine Science and Engineering   Vol. 9 ( 10 ) page: 1129   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/jmse9101129

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    Other Link: https://www.mdpi.com/2077-1312/9/10/1129

  11. STUDY ON SEA LEVEL RISE EFFECTS ON SHORELINE RETREAT ON A GRAVEL BEACH Reviewed

    FLORENTINA Sinta, NAKAMURA Tomoaki, CHO Yonghwan, MIZUTANI Norimi, TAKEUCHI Masayuki

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 77 ( 2 ) page: I_301 - I_306   2021.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> Climate change effects have become global concern through decades due to its emerging hazards. Sea Level Rise (SLR) is one of the effects which may cause harm to the coastal communities due to the risk of damages, such as shoreline retreat and beach erosion. There are many previous studies regarding the effect of SLR on sandy beaches. However, the study regarding gravel beach response under SLR is still rare. Therefore, this study is conducted to investigate the effect of SLR on the past shoreline change by using Bruun rule on currently eroded gravel beach, Ida beach in Shichiri-mihama coast, Mie Prefecture. By comparing the calculation result with the past shoreline change data obtained from network camera system, the proportion of SLR contribution in shoreline change can be assessed. Results shows that SLR contribution is ranging between 5.1 – 8.7% of the actual shoreline retreat from November 2017 to November 2019. This indicates that there are other factors such as extreme waves playing more dominant role in the shoreline change compared to SLR in this gravel beach.</p>

    DOI: 10.2208/jscejoe.77.2_i_301

    CiNii Research

  12. CHARACTERISTICS OF TOPOGRAPHIC CHAGE FOCUSED ON THE VARIATION OF DRY BULK DENSITY BY SLIP-OUT Reviewed

    AKAHOSHI Rei, CHO Yong-hwan, WATANABE Mikiya, NAKAMURA Tomoaki, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 77 ( 2 ) page: I_949 - I_954   2021.9

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    Authorship:Last author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> We conducted numerical analysis on changes in dry bulk density, hydraulic experiments on changes in fine particle fraction under uniform flow. The effect of the change in density on the change characteristics of the topography consisting of mixed sediment was investigated. As a result, when considering the total suspended amount, in sandy mixed earth and sand, it was suggested that it is necessary to consider the increase in the total suspended amount due to the increase in the proportion of fine particles and the decrease in the suspended amount due to the increase in the adhesive strength in the adhesive mixed sediment and sand.</p>

    DOI: 10.2208/jscejoe.77.2_i_949

    CiNii Research

  13. EVALUATION OF EFFECT OF WALL BEHIND BOTTOM-HINGED OWSC UNDER REGULAR WAVES Reviewed

    SATO Harutaka, CHO Yonghwan, NAKAMURA Tomoaki, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 77 ( 2 ) page: I_223 - I_228   2021.9

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    Authorship:Last author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> Two-dimensional hydraulic experiments were conducted using a reversed triangular bottom-hinged flap with the reflection wall behind it. Electricity generation performance when the power take-off system is installed was evaluated from the experimental result based on linear theory. Efficiency is lowest near the antinodes of the standing waves. There are some cases in which D/L when efficiency is highest is slightly different from nodes depends on wave period. Efficiency is high when the wave period is short and the water depth is small. There is a possibility that there is a specific wave period in which efficiency is extremely high. The increasing ratio of efficiency by installing the wall reached 6 at most and 2 at least.</p>

    DOI: 10.2208/jscejoe.77.2_i_223

    CiNii Research

  14. EXPERIMENTAL STUDY ON EFFECTIVENESS AND MECHANISM OF ANTI-OSCILLATION TANKS AGAINST MOTION OF FLOATING CAISSON Reviewed

    NAKAMURA Tomoaki, SHIRAI Kaito, CHO Yonghwan, MIZUTANI Norimi, KURAHARA Yoshinosuke, TAKEDA Masahide

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 77 ( 2 ) page: I_619 - I_624   2021.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> The effectiveness and mechanism of flume-type anti-oscillation tanks against the motion of a floating caisson under regular waves was investigated from hydraulic experiments. From experimental results, it was found that the amplitude of heave was little affected by free water filled in the anti-oscillation tanks. In contrast, the maximum value of the amplitude of pitch tended to decrease with an increase in the mass of free water. From anti-oscillation moment due to free water estimated from image analysis, it was revealed that gravitational force due to the free water accounted for a substantial fraction of the anti-oscillation moment, while horizontal inertia force had an effect of increasing the amplitude of the anti-oscillation moment. Furthermore, analytical solutions of the amplitude of pitch estimated from the anti-oscillation moment agreed reasonably well with experimental results. This suggested that the mechanism of anti-oscillation tanks can be explained in the same way as in the field of naval architecture.</p>

    DOI: 10.2208/jscejoe.77.2_i_619

    CiNii Research

  15. A Proposal of New Breaker Index Formula Using Supervised Machine Learning Reviewed International coauthorship

    Byung-Jong Choi, Chang-Wook Park, Yong-Hwan Cho, Do-Sam Kim, Kwang-Ho Lee

    Journal of Korean Society of Coastal and Ocean Engineers   Vol. 32 ( 6 ) page: 384 - 395   2020.12

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.9765/KSCOE.2020.32.6.1

  16. Modeling Tsunami-Induced Erosion of Bridge-Abutment Backfill Reviewed International journal

    Tomoaki Nakamura, Yuto Nakai, Yong-Hwan Cho and Norimi Mizutani

    Journal of Marine Science and Engineering   Vol. 8 ( 11 ) page: 1 - 16   2020.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/jmse8110922

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    Scopus

  17. Experimental study on spatiotemporal profile change in gravel beach Reviewed International journal

    Kim, S., Nakamura, T., Cho, Y., and Mizutani, N.

    International Journal of Offshore and Polar Engineering   Vol. 30 ( 3 ) page: 349 - 356   2020.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.17736/ijope.2020.hc19

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    Scopus

  18. Influence of Tidal Current, Wind, and Wave in Hebei Spirit Oil Spill Modeling Reviewed International coauthorship International journal

    Lee Kwang-Ho, Kim Tag-Gyeom, Cho Yong-Hwan

    JOURNAL OF MARINE SCIENCE AND ENGINEERING   Vol. 8 ( 2 )   2020.2

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/jmse8020069

    Web of Science

    Scopus

  19. STUDY ON TSUNAMI FORCE ACTING ON INLAND STRUCTURE BEHIND COASTAL PROTECTION FACILITY WITH RESILIENT STRUCTURE COMBINED WITH COASTAL DIKE AND EMBANKMENT

    NAKAMURA Tomoaki, SUZUKI Ryota, CHO Yonghwan, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 76 ( 2 ) page: I_156 - I_161   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> Tsunami-induced force acting on an inland building located at the landward side of a coastal protection facility with resilient structure combined with a coastal dike and an embankment was investigated numerically. Numerical results showed that the relationship between the tsunami force considering the erosion of the embankment and that assuming the constant profile of the embankment was affected by the scale of the erosion. This suggested that it is essential to take into account the erosion process of an embankment in assessing tsunami force acting on inland buildings.</p>

    DOI: 10.2208/jscejoe.76.2_i_156

    CiNii Research

  20. BEACH DEFORMATION ANALYSIS BY COMBINING NETWORK CAMERA AND UAV-SFM/MVS SURVEY

    CHO Yonghwan, NAKAYAMA Ryoya, KIKU Masami, NAKAMURA Tomoaki, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   Vol. 76 ( 2 ) page: I_655 - I_660   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> This study describes the improvement of the image analysis of network camera using the orthomosaic created from UAV-SfM/MVS survey and the morphological characteristics of Shichiri-Mihama Ida beach based on the estimated shoreline positions extracted by a network camera and DEM obtained by UAV-SfM/MVS survey. The estimated shoreline extracted from the network camera image denotes the position in the range of 1~2 m above sea level by comparison with the DEM so that it was located on the land side from the actual shoreline. The application of the network camera including UAV-SfM/MVS survey makes it possible to identify the waves that caused the beach deformation between observations.</p>

    DOI: 10.2208/kaigan.76.2_i_655

    CiNii Research

  21. EFFECT OF WAVE FIELD ON TIME SCALE OF EROSION OF SAND SEABED UNDER RUBBLE MOUND OF COMPOSITE BREAKWATER COVERED WITH WAVE DISSIPATING BLOCKS

    MURAOKA Hiroki, NAKAMURA Tomoaki, CHO Yonghwan, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   Vol. 76 ( 2 ) page: I_865 - I_870   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> Numerical analyses of 1/55.8-scale small experiments and 1/4-scale large experiments on sand erosion under the rubble mound of a composite breakwater were conducted to investigate the effect of wave field on the time scale of the erosion. Numerical results showed that the time for the averaged flow inside the mound to be offshore throughout the mound and the time for the wave field around the breakwater to be equilibrium were longer in the small-scale experiments than in the large-scale experiments, and consequently the erosion observed in the large-scale experiments was underestimated in the small-scale experiments. This suggested that the time for the erosion to reach the same depth as that of the large-scale experiments was longer than that estimated according to the Froude similarity law.</p>

    DOI: 10.2208/kaigan.76.2_i_865

    CiNii Research

  22. FUNDAMENTAL STUDY ON POWER GENERATION CHARACTERISTICS OF BOTTOM-HINGED WAVE ENERGY CONVERTER

    CHO Yonghwan, HONG Hyeonseon, KIM Shinwoong, NAKAMURA Tomoaki, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 76 ( 2 ) page: I_899 - I_904   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> The paper presents power generation characteristics of the proposed wave energy converter based on the bottom-hinged pendulum. The pendulum behavior becomes unstable and the power generation efficiency decreases when the wave energy is small, and the pendulum is installed at the position of <i>D/L</i> ≈ 0.5, which is the antinode of the standing wave. When the initial water depth was deeper than the pendulum, it was found that larger wave energy was required to rotate the pendulum stably. The maximum power generation efficiency (<i>k<sub>e</sub></i> = 0.77) was obtained at the position of <i>D/L</i> ≈ 0.32.</p>

    DOI: 10.2208/jscejoe.76.2_i_899

    CiNii Research

  23. NUMERICAL ANALYSIS OF WAVE DAMPING MECHANISM OF TEMPORARY FLOATING BREAKWATER

    NAKAMURA Tomoaki, YOSHIMURA Kazuki, CHO Yonghwan, MIZUTANI Norimi, KOTAKE Yasuo, SHIBUTANI Yoko

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 76 ( 2 ) page: I_372 - I_377   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> A temporary floating breakwater has been proposed to keep calm wave conditions in an offshore construction site. In this study, its wave damping mechanism was investigated from numerical simulations. Numerical results showed that the trend of the transmission coefficient can be predicted reasonably well. Furthermore, an energy damping coefficient of the breakwater changed depending on the breakwater width relative to the wavelength, and the change was explained in terms of vortices formed inside and under the breakwater. From numerical experiments, it was found that the barrier height of the breakwater and the free water depth poured inside the breakwater for most effectively reducing transmitted waves were dependence on the breakwater width relative to the wavelength.</p>

    DOI: 10.2208/jscejoe.76.2_i_372

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  24. STUDY ON INFLUENCE OF FOOTING WIDTH ON MOTION OF FLOATING CAISSON

    NAKAMURA Tomoaki, NAGAYAMA Naoto, CHO Yonghwan, MIZUTANI Norimi, KURAHARA Yoshinosuke, TAKEDA Masahide

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 76 ( 2 ) page: I_366 - I_371   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> In order to reduce the motion of a floating caisson, the effectiveness of a footing was investigated in terms of its width. Free oscillation experiments showed that the natural period of the pitch and the nonlinear extinction coefficients of the heave and pitch increased with the relative footing width. Forced oscillation experiments showed that the amplitude of the heave became large when the wave period was the same as the natural period of the heave. Similarly, the amplitude of the pitch increased when the wave period was one or two times larger than the natural period of the pitch. These suggested that it is essential to determine footing width considering the findings of this study.</p>

    DOI: 10.2208/jscejoe.76.2_i_366

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  25. REAL-SCALE NUMERICAL ASSESSMENT OF ARTIFICIAL REEF IN IDA BEACH

    KIM Shinwoong, NEHASHI Soraka, NAKAMURA Tomoaki, CHO Yonghwan, MIZUTANI Norimi, TAKEUCHI Masayuki

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 75 ( 2 ) page: I_971 - I_976   2019

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> In this study, to evaluate the effectiveness of the FS3M for assessing the countermeasures of beach erosion, the model was applied to the real-scale domain. We used the FS3M, which is a computational fluid dynamic model using the Navier-Stokes equation, and the survey data provided by Mie Prefecture. To address the problem of calculation cost, the numerical method called long-term estimation was used to calculate the evolution of the beach profile on the gravel beach. The validity of FS3M was investigated by applying the parameters used in the reflective type beach to the step type beach. The model reproduced well the position of the berm but shows a problem in the profile change under the water. However, in the process of wave propagation to the rear of the artificial reef, the reduction of the wave energy decreases the wave steepness, and the beach profile change for reflective type occurs predominantly. This fact shows that FS3M can be used to reproduce the beach profile change and evaluate the effects of artificial reef.</p>

    DOI: 10.2208/jscejoe.75.i_971

    CiNii Research

  26. EXPERIMENTAL STUDY ON THE INFLUENCE OF SPATIAL VARIATION OF CLAY ON THE TOPOGRAPHY CONSISTING OF MIXED SOIL

    AKAHOSHI Rei, CHO Yong-hwan, WATANABE Mikiya, NAKAMURA Tomoaki, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 75 ( 2 ) page: I_193 - I_198   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> As a part of elucidation of the dynamic characteristics of fine particles considered to be an important factor in maintenance for tidal flat, we carried out a hydraulic model experiment focusing on the change of topography consisting of sand-clay mixed sediments by wave conditions and clay content. The characteristics of the topography and the influence of the spatial distribution of clay on the sediment characteristics of the mixed sediment were investigated. As a result, in the case of sediment consisted of clay and sand, the effect of the cohesion of clay was effective in delaying the topographic change. Mixed sediment was eroded by the movement of sand after clay particle is washed out. Moved sand covered mixed sediment and reduced the erosion.</p>

    DOI: 10.2208/jscejoe.75.i_193

    CiNii Research

  27. DEVELOPMENT OF VOF-BASED NUMERICAL MODEL APPLICABLE TO UNSATURATED SOIL AND APPLICATION TO SEEPAGE AND EROSION PHENOMENA

    NAKAMURA Tomoaki, CHO Yonghwan, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 75 ( 2 ) page: I_229 - I_234   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    <p> A simple method to deal with unsaturated soil for the volume-of-fluid (VOF) method was proposed and incorporated into a VOF-based numerical model, FS3M. Furthermore, the FS3M was improved to compute unsaturated seepage flow more accurately. From comparison with experimental data, the predictive capability of the improved FS3M was demonstrated for unsaturated seepage in a dike and overflow-induced erosion of an unsaturated dike. This suggested the usefulness of the improved FS3M in assessing such phenomena related to unsaturated soil.</p>

    DOI: 10.2208/jscejoe.75.i_229

    CiNii Research

  28. STUDY ON EFFECTIVENESS OF CONFIGURATION CHANGE IN CAISSONS AGAINST OVERFLOW TSUNAMIS

    NAKAMURA Tomoaki, KANG Jiyoung, CHO Yonghwan, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 75 ( 2 ) page: I_773 - I_778   2019

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    <p> To prevent the overturning of caissons due to overflow tsunamis, the effectiveness of configuration change in the caissons was investigated from hydraulic experiments and numerical analyses. From experimental and numerical results, it was found that the resilience of a trapezoidal caisson was higher than that of a rectangular caisson and an L-shaped caisson because the configuration of the trapezoidal caisson prevented the separation of the overflow and the formation of a vortex reducing an increase in wave pressure acting on the landward surface of the caisson.</p>

    DOI: 10.2208/jscejoe.75.i_773

    CiNii Research

  29. EXPERIMENTAL STUDY ON EFFECTIVENESS OF GABIONS AGAINST TSUNAMI SCOUR AT LANDWARD TOE OF COASTAL DIKE

    NAKAMURA Tomoaki, TANIGUCHI Junya, CHO Yonghwan, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 75 ( 2 ) page: I_749 - I_754   2019

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    <p> The effectiveness of gabions against tsunami-induced scour at the landward toe of a coastal dike was investigated from hydraulic experiments. Experimental results showed that the installation of gabions moved a scour hole landward and reduced its maximum depth. This effect was reconfirmed from the hydraulic experiments in addition to existing numerical analyses not considering the leakage of sand and the displacement of gabions. Furthermore, it was found that a scour hole grew rapidly due to sand leakage after the gabions were displaced largely. This suggested that connected gabions could be more effective to reduce the displacement of the gabions and the gaps between the gabions.</p>

    DOI: 10.2208/jscejoe.75.i_749

    CiNii Research

  30. STUDY ON PERFORMANCE OF ANTI-OSCILLATION TANK AGAINST MOTION OF FLOATING CAISSON AND ITS SIMPLE ESTIMATION METHOD

    NAKAMURA Tomoaki, ONUMA Fumito, CHO Yonghwan, MIZUTANI Norimi, EGUCHI Mikiko, KURAHARA Yoshinosuke, TAKEDA Masahide

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 75 ( 2 ) page: I_403 - I_408   2019

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    <p> The effectiveness of flume-type anti-oscillation tanks installed on a floating caisson in the pitch and roll directions under regular waves and multi-directional irregular waves was investigated from hydraulic experiments, and a simple numerical method for estimating the effect of the anti-oscillation tanks was developed and applied to the hydraulic experiments. From experimental results, it was revealed that the anti-oscillation tanks can reduce the pitch of the caisson increased at around the natural frequency and its double frequency under the regular waves. Furthermore, the anti-oscillation tanks were found to be effective against not only the pitch but also the roll under the multi-directional irregular waves. From numerical results, it was found that the effect of the anti-oscillation tanks can be estimated reasonably well in terms of the amplitude of the pitch. This suggested the usefulness of the developed method in estimating the most effective water volume in anti-oscillation tanks.</p>

    DOI: 10.2208/jscejoe.75.i_403

    CiNii Research

  31. EXPERIMENTAL STUDY ON WAVE HEIGHT REDUCTION EFFECT AND DYNAMIC BEHAVIOR OF TEMPORARY FLOATING BREAKWATER

    NAKAMURA Tomoaki, YOSHIMURA Kazuki, CHO Yonghwan, MIZUTANI Norimi, KOTAKE Yasuo, SHIBUTANI Yoko

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   Vol. 75 ( 2 ) page: I_781 - I_786   2019

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    <p> A temporary floating breakwater has been proposed to keep calm wave conditions in an offshore construction site. In this study, its transmission coefficient and dynamic behavior were investigated from hydraulic experiments. Experimental results showed that the transmission coefficient decreased with an increase in the wave steepness and relative breakwater width. Furthermore, the time from the peak of the heave to that of the sway increased with the relative breakwater width and the temporal changes in the heave and sway had a nearly opposite phase for large relative breakwater widths, resulting in the abovementioned decrease in the transmission coefficient.</p>

    DOI: 10.2208/kaigan.75.i_781

    CiNii Research

  32. NUMERICAL SIMULATION OF TSUNAMI SCOUR AT LANDWARD TOE OF COASTAL DIKE AND EVALUATION OF EFFECTIVENESS OF GABIONS

    NAKAMURA Tomoaki, TANIGUCHI Junya, CHO Yonghwan, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   Vol. 75 ( 2 ) page: I_703 - I_708   2019

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    <p> A three-dimensional coupled fluid-structure-sediment-seabed interaction model (FS3M) was applied to hydraulic experiments on the effectiveness of gabions against tsunami scour at the landward toe of a coastal dike. Numerical results showed that the predictive capability of the FS3M was demonstrated in terms of temporal change in the maximum scour depth for all conditions without the gabions and a small discharge condition with the gabions. From numerical results for a large discharge condition with the gabions, which subsided due to sand leakage in the hydraulic experiments, it was suggested that it was essential to take into account the subsidence of the gabions in accurately assessing the effectiveness of gabions.</p>

    DOI: 10.2208/kaigan.75.i_703

    CiNii Research

  33. INTRODUCTION OF CLAY LOSS TO MIXED SOIL CALCULATION

    CHO Yonghwan, NAKAMURA Tomoaki, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   Vol. 75 ( 2 ) page: I_475 - I_480   2019

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    <p> This paper describes the method to calculate sediment transport in the mixed soil condition composed of sand and clay considering the change of clay contents due to clay loss. The concepts of the four-phase soil model and the maximum clay contents classifying mixed soil status were introduced into the method. The model incorporating the proposed method was tested under the experimental conditions. From the numerical results, when all the clay in the clay activation layer where clay loss can occur was flowed out, the suspended concentration of clay decreased with time similar to the experimental results. The suspended concentration of clay was remarkable at the offshore and onshore of the movable bed consisting of sand and clay, and the decrease of the clay content on the surface of the bed was confirmed in the same locations due to clay loss. Therefore, the proposed model suggests the possibility to improve the accuracy of sediment calculation in mixed soil condition and to clarify the mechanism of clay loss from the surface of mixed soil.</p>

    DOI: 10.2208/kaigan.75.i_475

    CiNii Research

  34. 命山基部に使用したPCマクラギの耐津波安定性に関する研究 Reviewed

    趙 容桓, 山田 悠貴, 中村 友昭, 水谷 法美

    土木学会論文集B2(海岸工学)   Vol. 74 ( 2 ) page: I_301-I_306   2018.11

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    DOI: 10.2208/kaigan.74.I_301

  35. 消波ブロック被覆堤マウンド下部の砂地盤の侵食と石かごが与える影響に関する実験的研究 Reviewed

    村岡宏紀,中村友昭,趙 容桓,水谷法美

    土木学会論文集B1(水工学)   Vol. 74 ( 2 ) page: I_595-I_600   2018.11

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  36. 陸上構造物に作用する津波力に与える浮遊砂の影響に関する研究 Reviewed

    中村 友昭, 中井 祐斗, 趙 容桓, 水谷 法美

    土木学会論文集B3(海洋開発)   Vol. 74 ( 2 ) page: I_210-I_215   2018.9

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    DOI: 10.2208/jscejoe.74.I_210

  37. Experimental study on gravel beach deformations under irregular waves Reviewed

    Shinwoong KIM, Ryoya NAKAYAMA, Tomoaki NAKAMURA, Soraka NEHASHI, Yonghwan CHO, Norimi MIZUTANI

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 74 ( 2 ) page: I_731-I_736   2018.9

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    DOI: 10.2208/jscejoe.74.I_731

  38. 体積変化量に着目した七里御浜井田海岸の海浜変形特性に関する研究 Reviewed

    趙 容桓, 小林 泰輔, 菊 雅美, 中村 友昭, 水谷 法美

    土木学会論文集B3(海洋開発)   Vol. 74 ( 2 ) page: I_647-I_652   2018.9

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    DOI: 10.2208/jscejoe.74.I_647

  39. 消波ブロック被覆堤下部からの砂地盤の吸い出しに関する実験的研究 Reviewed

    中村 友昭, 村岡 宏紀, 趙 容桓, 水谷 法美

    土木学会論文集B3(海洋開発)   Vol. 74 ( 2 ) page: I_258-I_263   2018.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 土木学会  

    DOI: 10.2208/jscejoe.74.I_258

  40. Failure Mechanism of Armor Blocks of Submerged Breakwater Reviewed

    Cho Yong Hwan, Zhang Chu, Nakamura Tomoaki, Mizutani Norimi

    JOURNAL OF COASTAL RESEARCH   ( 85 ) page: 1166-1170   2018.5

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    DOI: 10.2112/SI85-234.1

    Web of Science

  41. EXPERIMENTAL STUDY ON EROSION OF SAND SEABED UNDER RUBBLE MOUND OF COMPOSITE BREAKWATER COVERED WITH WAVE DISSIPATING BLOCKS AND EFFECTS OF GABIONS

    MURAOKA Hiroki, NAKAMURA Tomoaki, CHO Yonghwan, MIZUTANI Norimi

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   Vol. 74 ( 5 ) page: I_595 - I_600   2018

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    <p> In this study, 1/55.8-scale hydraulic experiments on a composite breakwater with gabions like large-scale hydraulic experiments were carried out to organize what should be considered in determining the sizes of mound gravel and seabed sand. Experimental results showed that same flow fields around the breakwater were formed as hydraulic experiments without gabions. Similar with the large-scale hydraulic experiments, sand seabed benearth the seaward part of the mound was eroded. However, the time at which this eroded depth reached to that for the large-scale hydraulic experiments needed to be longer than the time determined according to the Froude similarity law. This suggested that further studies are required for the time scale of the erosion of the sand seabed benearth the mound.</p>

    DOI: 10.2208/jscejhe.74.5_i_595

    CiNii Research

  42. 画像解析を用いた七里御浜井田海岸における海浜地形の変化特性に関する研究 Reviewed

    渡邉 博之, 趙 容桓, 菊 雅美, 中村 友昭, 水谷 法美

    土木学会論文集B2(海岸工学)   Vol. 73 ( 2 ) page: I_673-I_678   2017.10

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    DOI: 10.2208/kaigan.73.I_673

  43. 潜堤法肩部の被覆ブロックの被災機構に関する研究 Reviewed

    趙 容桓, 張 楚, 中村 友昭, 水谷 法美

    土木学会論文集B2(海岸工学)   Vol. 73 ( 2 ) page: I_1099-I_1104   2017.10

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    DOI: 10.2208/kaigan.73.I_1099

  44. 津波の越流により生じる海岸堤防裏法尻周辺の流動場の特徴と洗掘対策の有効性に関する数値解析 Reviewed

    中村友昭,日比野加奈,趙 容桓,水谷法美

    土木学会論文集B3(海洋開発)   Vol. 73 ( 2 ) page: I_114-I_119   2017.8

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    DOI: 10.2208/jscejoe.73.I_114

  45. 上部斜面堤ケーソンの動揺特性に関する3次元数値解析 Reviewed

    中村 友昭, 山本 勘太, 趙 容桓, 水谷 法美, 小竹 康夫

    土木学会論文集B3(海洋開発)   Vol. 73 ( 2 ) page:  I_707-I_712   2017.8

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    DOI: 10.2208/jscejoe.73.I_707

  46. 波作用下における混合土砂底面の粘土抜け出し効果 Reviewed

    赤星 怜, 趙 容桓, 中村 友昭, 水谷 法美

    土木学会論文集B3(海洋開発)   Vol. 73 ( 2 ) page: I_696-I_701   2017.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 土木学会  

    DOI: 10.2208/jscejoe.73.I_696

  47. Wave hindcast and beach profile changes under high wave condition at Shichiri-Mihama Ida Beach Reviewed

    土木学会論文集B3(海洋開発)   Vol. 73 ( 2 ) page: I_162-I_167   2017.8

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    DOI: 10.2208/jscejoe.73.I_162

  48. Numerical calculation of flow field and optimal operation during the drop of grab bucket Reviewed

    LONG Rui, Tomoaki Nakamura, Yonghwan Cho, Norimi Mizutani, Tsuyoshi Kanazawa

    JOURNAL of Yangtze River Scientific Research Institute   Vol. 34 ( 12 ) page: 7-11   2017.7

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    Language:Chinese   Publishing type:Research paper (scientific journal)  

    DOI: 10.11988/ckyyb.20170785

  49. Development of fluid-sediment interaction model considering infiltration/exfiltration for long-term beach profile change and its application to gravel beach Reviewed

    Kim, S.-W., Cho, Y.-H., Nakamura, T., and Mizutani, N.

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   Vol. 72 ( 2 ) page: I_679-I_684   2016.11

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    DOI: 10.2208/kaigan.72.I_679

  50. 東北地方太平洋沖地震津波による海岸堤防裏法尻の洗掘と対策工の有効性に関する数値解析 Reviewed

    中村友昭,日比野加奈,趙容桓,水谷法美,小竹康夫

    土木学会論文集B2(海岸工学)   Vol. 71 ( 2 ) page: I_1099-I_1104   2015.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 土木学会  

    DOI: 10.2208/kaigan.71.I_1099

  51. 矢板式岸壁の腐食孔からの埋立土砂の吸い出し機構に関する研究 Reviewed

    中村友昭,福田 俊,趙 容桓,水谷法美

    土木学会論文集B3(海洋開発)   Vol. 72 ( 2 ) page: I_724-I_729   2015.8

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    DOI: 10.2208/jscejoe.72.I_724

  52. 3次元波浪場における上部斜面堤ケーソンの動揺特性に関する実験的研究 Reviewed

    中村友昭,伊藤早紀,山本勘太,趙 容桓,水谷法美,小竹康夫

    土木学会論文集B3(海洋開発)   Vol. 72 ( 2 ) page: I_223-I_228   2015.8

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    DOI: 10.2208/jscejoe.72.I_223

  53. 浮遊砂による流体の粘度の変化と一様流および津波による流動場に与える影響に関する研究 Reviewed

    中村友昭,鈴木愛美,趙 容桓,水谷法美

    土木学会論文集B3(海洋開発)   Vol. 72 ( 2 ) page: I_163-I_168   2015.8

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    DOI: 10.2208/jscejoe.72.I_163

  54. An Experimental Study on Influences of Cohesive Sediments on Sediment Transport of Mixed Soil Reviewed

    Cho, Y. H., Nakamura, T., Suzuki, M., Mizutani, N.

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 70 ( 2 ) page: I_738-I_743   2014.10

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    DOI: 10.2208/jscejoe.70.I_738

  55. An Experimental Study on the Wave-Induced Topographic Change in Artificial Shallows Reviewed

      Vol. 56 ( 2 ) page: 1450008_1 - 1450008_21   2014.6

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    DOI: 10.1142/S0578563414500089

  56. A Numerical Simulation of Wave-Induced Topographic Change in shallows Composed of Fine Sand Reviewed

    Cho, Y. H.,Nakamura, T.,Mizutani, N.,Lee, K. H.

    Journal of Advanced Simulation in Science and Engineering   Vol. 1 ( 1 ) page: 72-86   2014

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    DOI: 10.15748/jasse.1.72

  57. 粘性力の影響を考慮した漂砂計算手法の提案と浅場の地形変化への適用 Reviewed

    中村友昭,趙 容桓,水谷法美,李 光浩

    土木学会論文集B3(海洋開発)   Vol. 69 ( 2 ) page: I_1036 - I_1041   2013.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 土木学会  

    DOI: 10.2208/jscejoe.69.I_1036

  58. Sediment Transport Calculation Considering Cohesive Effects and Its Application to Wave-Induced Topographic Change Reviewed

    Cho, Y. H., Nakamura, T., Mizutani, N., Lee, K. H.

    Journal of Korean Society of Coastal and Ocean Engineers   Vol. 25 ( 6 ) page: 405 - 411   2013

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Presentations 76

  1. 津波による海岸堤防背後盛土の侵食に与える漂砂パラメータの影響に関する一考察

    鈴木涼太,中村友昭,趙容桓,水谷法美

    令和3年度土木学会中部支部研究発表会  2022.3.4 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  2. 不規則波下におけるケーソン動揺低減対策としての減揺タンクの有効性に関する一考察

    竹山俊介,白井開斗,中村友昭,趙 容桓,水谷法美,倉原義之介,武田将英

    令和3年度土木学会中部支部研究発表会  2022.3.4 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  3. 深層学習による海岸画像を用いた波浪予測に関する一検討

    宮下侑莉華,中村友昭,菊 雅美,趙 容桓,水谷法美

    令和3年度土木学会中部支部研究発表会  2022.3.4 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  4. 有脚式離岸堤の杭基礎回りの局所洗掘現象への感度分析に関する一考察

    内藤龍之介,中村友昭,趙 容桓,水谷法美,山野貴司

    令和3年度土木学会中部支部研究発表会  2022.3.4 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  5. 津波による作用波圧に与える浮遊砂の影響に関する一考察

    高重建太,中村友昭,趙容桓,水谷法美

    令和3年度土木学会中部支部研究発表会  2022.3.4 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  6. 津波による橋台背面盛土の侵食が桁への作用津波力に与える影響に関する一考察

    熊澤諒大,中村友昭,趙容桓,水谷法美

    令和3年度土木学会中部支部研究発表会  2022.3.4 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  7. 津波による橋台背面盛土の侵食と橋桁への作用津波力に与える影響に関する数値シミュレーション

    中村友昭,熊澤諒大,趙容桓,水谷法美

    第35回数値流体力学シンポジウム  2021.12.16 

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    Event date: 2021.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  8. 津波による橋台背面盛土の侵食機構と侵食対策の有効性に関する一考察

    杉山知里,中村友昭,趙 容桓,水谷法美

    令和2年度土木学会中部支部研究発表会  2021 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  9. 浮遊ケーソンの動揺に与える減揺タンクの自由水量の影響に関する一考察

    白井開斗,中村友昭,趙 容桓,水谷法美,倉原義之介,武田将英

    令和2年度土木学会中部支部研究発表会 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  10. 反射壁の有無による振り子式波力発電装置の回転特性に関する一考察

    佐藤晴高,趙 容桓,中村友昭,水谷法美

    令和2年度土木学会中部支部研究発表会 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  11. 円形造波水槽を用いた沿岸漂砂機構と人工リーフの効果に関する実験的研究

    秋田直輝,中村友昭,趙 容桓,水谷法美

    令和2年度土木学会中部支部研究発表会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  12. 不規則波下での浮遊ケーソンの動揺に与えるフーチング幅の影響に関する数値解析

    中村友昭,永山直人,趙 容桓,水谷法美,倉原義之介,武田将英

    混相流シンポジウム2020 

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    Event date: 2020.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  13. 津波による海岸堤防背後盛土の侵食と背後の構造物への作用津波力に与える影響に関する数値解析

    鈴木涼太,中村友昭,趙 容桓,水谷法美

    令和元年度土木学会中部支部研究発表会 

     More details

    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  14. 陸上遡上津波による橋台背面盛土の侵食と舗装の影響に関する一考察

    中井祐斗,中村友昭,趙 容桓,水谷法美

    令和元年度土木学会中部支部研究発表会 

     More details

    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  15. 波浪中における仮設式波除堤の動揺に関する数値シミュレーション

    吉村一樹,中村友昭,趙 容桓,水谷法美,小竹康夫,澁谷容子

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  16. ネットワークカメラから抽出した汀線位置とDEMとの関係に関する一考察

    中山遼哉,趙 容桓,菊 雅美,中村友昭,水谷法美

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  17. 円形造波水槽の製作および沿岸漂砂機構解明に関する実験的研究

    秋田直輝,Hoang Hai DONG,趙 容桓,中村友昭,水谷法美

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  18. 浮遊ケーソンの波浪動揺特性に与えるフーチングの影響に関する一考察

    永山直人,中村友昭,趙 容桓,水谷法美,倉原義之介,武田将英

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  19. 消波ブロック被覆堤マウンド下部の砂地盤の侵食に関する一考察

    村岡宏紀,中村友昭,趙 容桓,水谷法美

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  20. Morphological evolution of clay/sand mixture focusing on clay loss International conference

    Cho, Y. H., Watanabe, M., Nakamura, T. and Mizutani, N.

    Proceedings of 10th Asian and Pacific Coasts (APAC 2019) 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Viet Nam  

  21. 越流津波による海岸堤防裏法尻の洗掘に関する数値シミュレーション

    中村友昭,谷口淳也,趙 容桓,水谷法美

    混相流シンポジウム2019 

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    Event date: 2019.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡大学七隈キャンパス   Country:Japan  

  22. 陸上遡上津波による橋台背面盛土の侵食と舗装の影響に関する一考察

    中井祐斗,中村友昭,趙 容桓,水谷法美

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  23. 津波による海岸堤防背後盛土の侵食と背後の構造物への作用津波力に与える影響に関する数値解析

    鈴木涼太,中村友昭,趙 容桓,水谷法美

    令和元年度土木学会中部支部研究発表会 

     More details

    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  24. 消波ブロック被覆堤マウンド下部の砂地盤の侵食に関する一考察

    村岡宏紀,中村友昭,趙 容桓,水谷法美

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  25. 浮遊ケーソンの波浪動揺特性に与えるフーチングの影響に関する一考察

    永山直人,中村友昭,趙 容桓,水谷法美,倉原義之介,武田将英

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  26. 円形造波水槽の製作および沿岸漂砂機構解明に関する実験的研究

    秋田直輝,Hoang Hai DONG,趙 容桓,中村友昭,水谷法美

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  27. ネットワークカメラから抽出した汀線位置とDEMとの関係に関する一考察

    中山遼哉,趙 容桓,菊 雅美,中村友昭,水谷法美

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  28. 波浪中における仮設式波除堤の動揺に関する数値シミュレーション

    吉村一樹,中村友昭,趙 容桓,水谷法美,小竹康夫,澁谷容子

    令和元年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野工業高等専門学校   Country:Japan  

  29. 数値解析による礫浜の海浜変形予測に関する一考察

    根橋宙加,金 信雄,中村友昭,趙 容桓,水谷法美

    平成30年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学八草キャンパス   Country:Japan  

  30. ケーソンの動揺に対する減揺タンクの有効性に関する一考察

    大沼史都,中村友昭,趙 容桓,水谷法美,江口三希子,武田将英,倉原義之介

    平成30年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学八草キャンパス   Country:Japan  

  31. 沿岸流生成機構解明のための円形数値波動水槽の開発

    加藤里紗,中村友昭,趙 容桓,水谷法美

    平成30年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学八草キャンパス   Country:Japan  

  32. 越流した津波による洗掘に蛇籠工が与える効果の実験的研究

    谷口淳也,中村友昭,趙 容桓,水谷法美

    平成30年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学八草キャンパス   Country:Japan  

  33. 仮設式波除堤による波高低減効果に関する実験的研究

    吉村一樹,中村友昭,趙 容桓,水谷法美,小竹康夫

    平成30年度土木学会中部支部研究発表会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学八草キャンパス   Country:Japan  

  34. 津波の越流による海岸堤防裏法尻の洗掘と蛇籠工が与える影響について

    谷口淳也,中村友昭,趙 容桓,水谷法美

    第32回数値流体力学シンポジウム 

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    Event date: 2018.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:機械振興会館   Country:Japan  

  35. 多相流モデルにおける不規則波の造波と越波現象への適用

    中村友昭,吉村一樹,趙 容桓,水谷法美

    混相流シンポジウム2018 

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス   Country:Japan  

  36. Simulation of tsunami force in the presence of beachside structures International conference

    Nakamura, T., Yamashita, A., Mizutani, N., and Cho, Y.

    Proc., 36th International Conference on Coastal Engineering 

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    Event date: 2018.7 - 2018.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Baltimore, MD, USA   Country:United States  

  37. Experimental investigation of spatiotemporal change in gravel beach profile International conference

    Kim, S., Nakamura, T., Nehashi, S., Cho, Y., and Mizutani, N.

    Proc., 28th International Offshore and Polar Engineering Conference, ISOPE 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sapporo, JAPAN   Country:Japan  

  38. Suspended Clay Load from Mixed Soil under Regular Waves International conference

    Akahoshi, R., Cho, Y.-H., Nakamura, T., Mizutani, N.

    Proc., 28th International Offshore and Polar Engineering Conference, ISOPE 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sapporo, JAPAN   Country:Japan  

  39. Failure mechanism of armor blocks of submerged breakwater International conference

    Cho, Y. H., Chu, Z., Nakamura, T., and Mizutani, N.

    Proc., 15th International Coastal Symposium 

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    Event date: 2018.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Busan, Republic of Korea   Country:Korea, Republic of  

  40. 命山底層部に導入したPCマクラギの耐津波安定性に関する実験的研究

    山田悠貴,趙 容桓,中村友昭,水谷法美

    平成29年度土木学会中部支部研究発表会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス   Country:Japan  

  41. 七里御浜井田海岸の波浪打上げ高による海浜変形に関する一考察

    小林泰輔,金 信雄,菊 雅美,趙 容桓,中村友昭,水谷法美

    平成29年度土木学会中部支部研究発表会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス   Country:Japan  

  42. 陸上構造物への作用津波力に与える浮遊砂の影響に関する一考察

    中井祐斗,中村友昭,趙 容桓,水谷法美

    平成29年度土木学会中部支部研究発表会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス   Country:Japan  

  43. 多相流モデルへの不規則波の造波機能の組み込みとその精度の検証について

    吉村一樹,中村友昭,趙 容桓,水谷法美

    平成29年度土木学会中部支部研究発表会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス   Country:Japan  

  44. 規則波による礫浜海岸の地形変化に関する一考察

    中山遼哉,根橋宙加,金 信雄,中村友昭,趙 容桓,水谷法美

    平成29年度土木学会中部支部研究発表会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス   Country:Japan  

  45. 不規則波による礫浜海岸の地形変化と規則波との差異に関する一考察

    根橋宙加,中山遼哉,金 信雄,中村友昭,趙 容桓,水谷法美

    平成29年度土木学会中部支部研究発表会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス   Country:Japan  

  46. 3次元流体・構造・地形変化・地盤連成数値計算モデルにおける不規則波の造波・吸収性能について

    中村友昭,趙 容桓,水谷法美

    第31回数値流体力学シンポジウム 

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    Event date: 2017.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都工芸繊維大学松ヶ崎キャンパス   Country:Japan  

  47. PCマクラギの津波避難施設への応用に関する一考察

    山田悠貴,趙 容桓,中村友昭,水谷法美

    土木学会第72回年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学伊都キャンパス   Country:Japan  

  48. 津波の越流により生じる海岸堤防裏法尻周辺の流動場の形成条件に関する一考察

    中村友昭,日比野加奈,趙 容桓,水谷法美

    土木学会第72回年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学伊都キャンパス   Country:Japan  

  49. 長周期波による潜堤の岸側法肩部における被覆ブロックの被災機構に関する数値的研究

    趙 容桓,張 楚,中村友昭,水谷法美

    土木学会第72回年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学伊都キャンパス   Country:Japan  

  50. グラブバケット降下時の底質の巻き上げに関する数値シミュレーション

    中村友昭,龍 瑞,趙 容桓,水谷法美,金澤 剛

    混相流シンポジウム2017 

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    Event date: 2017.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:電気通信大学   Country:Japan  

  51. 高濃度の浮遊砂が津波力に与える影響に関する一考察

    中村友昭,趙 容桓,水谷法美

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  52. Wave hindcasting simulation at Ida beach, JSCE Chubu Branch Annual Meeting 2016

    Kim, S., Nakamura, T., Cho, Y., and Mizutani N.

    JSCE Chubu Branch Annual Meeting 2016 

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    Event date: 2017.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  53. 礫浜海岸におけるバームの形成過程に関する一考察察

    根橋宙加,Shinwoong Kim,中村友昭,趙 容桓 水谷法美

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  54. Sobel gradientの適用による礫浜における汀線自動抽出の完全性向上

    趙 容桓,赤星 怜,中村友昭,水谷法美

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  55. 波浪場における混合土砂の移動評価式に関する一考察

    赤星 怜,趙 容桓,中村友昭,水谷法美

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  56. 密閉式バケット降下時の底面流速に関する一考察

    龍 瑞,中村友昭,趙 容桓,水谷法美,金澤 剛

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  57. 3次元波動場における上部斜面堤の動揺に関する数値シミュレーション

    山本勘太,中村友昭,趙 容桓,水谷法美,小竹康夫

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  58. 数値解析に基づいた潜堤上の被覆ブロックの耐波安定性に関する研究

    張 楚,水谷法美,中村友昭,趙 容桓

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  59. 越流した津波により海岸堤防裏法尻に生じる流れ場の形成条件に関する数値解析

    日比野加奈,中村友昭,趙 容桓,水谷法美

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  60. 越流した津波による海岸堤防裏法尻の洗掘に与える蛇籠工の効果に関する一考察

    谷口淳也,中村友昭,趙 容桓,水谷法美

    平成28年度土木学会中部支部研究発表会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス   Country:Japan  

  61. 潜堤上の密度が異なる被覆ブロックの安定性に関する考察

    趙 容桓,山田悠貴,中村友昭,水谷法美

    土木学会第71回年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学川内北キャンパス   Country:Japan  

  62. 漂砂による地形変化計算時における斜面崩壊の取り扱いに関する一考察

    中村友昭,趙 容桓,水谷法美

    土木学会第71回年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学川内北キャンパス   Country:Japan  

  63. 矢板式岸壁腐食孔からの埋立土砂の吸い出し機構に関する実規模数値解析

    福田 俊,中村友昭,趙 容桓,水谷法美

    土木学会第71回年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学川内北キャンパス   Country:Japan  

  64. Numerical sensitivity analysis for dynamic behaviour on gravel beach

    Kim, S.-W., Cho, Y.-H., Nakamura, T., Mizutani, N.

    JSCE Chubu Branch Annual Meeting 2015 

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    Event date: 2016.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  65. 津波の越流により形成される海岸堤防裏法尻の流動場に関する数値解析

    趙 容桓,日比野加奈,中村友昭,水谷法美,小竹康夫

    土木学会第70回年次学術講演会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  66. 東北地方太平洋沖地震津波による海岸堤防裏法尻の洗掘に関する数値解析

    日比野加奈,趙 容桓,中村友昭,水谷法美,小竹康夫

    平成26年度土木学会中部支部研究発表会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  67. 干潟の地形変化特性とそれに与える混合材の影響に関する一考察

    鈴木愛美,趙 容桓,中村友昭,水谷法美

    平成25年度土木学会中部支部 

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    Event date: 2014

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  68. 粘土を含有する干潟の地形変化と粘着力を考慮した修正限界Shields数による混合土砂の移動特性の検討に関する実験的研究

    趙 容桓,中村友昭,鈴木愛美,水谷法美

    土木学会第69回年次学術講演会 

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    Event date: 2014

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  69. 粘着性を考慮した干潟の地形変化特性に関する数値的研究

    趙 容桓,中村友昭,水谷法美

    平成25年度土木学会中部支部 

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    Event date: 2014

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  70. 粘着力を考慮した漂砂計算手法と粘着力が地形変化に及ぼす影響に関する一考察

    趙 容桓,中村友昭,水谷法美

    平成24年度土木学会中部支部 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  71. Sediment Transport Calculation Considering Cohesive Effects and its Application to Wave-induced Topographic Change International conference

    Cho, Y. H., Nakamura, T., Mizutani, N. and Lee, K. H.

    Proceedings of 7th Asian and Pacific Coasts (APAC 2013) 

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    Event date: 2013

    Language:English   Presentation type:Oral presentation (general)  

    Country:Indonesia  

  72. A Numerical Simulation of Wave-Induced Topographic Change of Shallow Composed of Fine Sand International conference

    Cho, Y. H., Nakamura, T., Mizutani, N. and Lee, K. H.

    Proceedings of 32nd International Conference on Simulation Technology (JSST 2013) 

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    Event date: 2013

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  73. Possibility of Seiche of Pohang New Port due to Edge Waves under Ever Present Amplitude Modulating Swell of Narrow Band Width

    Cho, Y. H., Cho, Y. J., Nakamura, T., and Mizutani, N.

    JSCE Chubu Branch Annual Meeting 2011 

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    Event date: 2011

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  74. About the possibility of Seiches of Pohang New Port excited by edge waves behind ever present swell of narrow band width International conference

    Cho, Y. J., Cho, Y. H., and Kim, M. K.

    Joint Symposium of the Korean association of Ocean science and Technology societies 

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    Event date: 2010.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  75. About the likelihood of restoration of eroded river beach International conference

    Cho, Y. J., and Cho, Y. H.

    11th Seoul Shanghai academic Forum(SSF) 

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    Event date: 2009

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  76. 高濃度の浮遊砂が津波力に与える影響に関する一考察 International conference

    中村友昭, 趙 容桓, 水谷法美

    平成28年度土木学会中部支部研究発表会  2017.3.3 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学角間キャンパス  

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Research Project for Joint Research, Competitive Funding, etc. 5

  1. 規則波における反射壁を活用した下部ヒンジ型WECのパラメトリック設計に向けた基礎実験と波エネルギーの吸収能力向上させる新型WECの提案

    2020.10 - 2022.9

    研究助成 

    趙 容桓

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    Authorship:Principal investigator  Grant type:Collaborative (industry/university)

    Grant amount:\2380000 ( Direct Cost: \2380000 )

  2. 混合土砂漂砂モデルの拡張および砕波帯における粘土の流失による粘土/砂層の分離メカニズムの数値的一考察

    2020.4 - 2021.3

    研究助成 

    趙 容桓

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    Authorship:Principal investigator  Grant type:Collaborative (industry/university)

    Grant amount:\1000000

  3. 浮体の動揺特性に関する基礎研究

    2021.9 - 2022.3

    2019年度第1回革新的社会資本整備研究開発推進事業  共同研究

    水谷法美,中村友昭,趙容桓

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    Authorship:Coinvestigator(s) 

    Grant amount:\1100000 ( Direct Cost: \956522 、 Indirect Cost:\143478 )

  4. 津波による小型船舶の漂流挙動と壁体への衝突力に関する研究

    2021.6 - 2023.3

    公募研究  共同研究

    水谷法美,中村友昭,趙容桓

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\4517000 ( Direct Cost: \4165911 、 Indirect Cost:\351276 )

  5. 浮体の動揺特性に関する基礎研究

    2020.9 - 2021.3

    2019年度第1回革新的社会資本整備研究開発推進事業  共同研究

    水谷法美,中村友昭,趙容桓

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    Authorship:Coinvestigator(s) 

    Grant amount:\2200000 ( Direct Cost: \1913044 、 Indirect Cost:\286956 )

KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. 粘土流失特性を考慮した混合土砂モデルの改良と砂礫の漂砂計算への拡張

    Grant number:20K14837  2020.4 - 2022.3

    科学研究費助成事業  若手研究

    趙 容桓

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    Authorship:Principal investigator 

    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    本研究では,粘土と砂からなる混合土砂における粘土の移動特性と,砂と礫からなる混合土砂における礫の移動特性を究明するとともに,混合土砂の漂砂計算モデルの構築を目指して,粘土含有率による混合土砂の表層で発生する粘土の流失特性と砂含有率による礫の移動限界変化に着目した水理模型実験を実施する.構築する混合土砂モデルによって,人工干潟における粘土の動的管理に活用できるツールの開発に一歩踏み出すことや混合土砂モデルの適用範囲を砂と礫からなる混合土砂の漂砂計算まで拡張することで,海浜地形変化の予測精度を向上させることが期待される.
    天然・人工干潟における粘土成分の動的管理のためには,砂と細粒分(粘土,シルト)からなる混合土砂の移動特性の究明が重要である.本研究では,混合土砂の乾燥かさ密度に着目し,砂と細粒分(カオリン)からなる混合土砂における土砂割合(含有率)が混合土砂の移動特性に及ぼす影響を検討する水理模型実験と混合土砂モデルの改良を実施した.
    混合土砂の乾燥かさ密度実験においては,初期試料の攪拌有無によって,細粒分の見かけの体積増加と初期圧密の進展度の違いが確認され,乾燥かさ密度に影響を及ぼすことが判明した.また,従来の1次圧密終了後の乾燥かさ密度の算定式を基に,本実験における細粒分と砂それぞれが100%存在するときの乾燥かさ密度を適用した乾燥かさ密度と細粒分の含有率の関係式が得られた.
    一様流作用下における細粒分の抜け出し特徴に関する実験では,高細粒分含有率の混合土砂において,ある限界深さまで圧密過程での間隙水の充填と一様流による底面せん断応力の作用によって,底質の液状化及び分級が発生し,底質内部からの細粒分の抜け出し現象が生じうることが示唆された.また,低細粒分含有率において,ある閾値以上の底面せん断応力が作用する場合,作用時間によって内部から浸透流による細粒分の抜け出し現象が発生することを確認した.なお,混合土砂の乾燥かさ密度実験で得られた細粒分含有率と乾燥かさ密度の関係式を利用し,本研究で用いた混合土砂に対する限界Shields数が得られた.
    数値計算においては,混合土砂モデルに一様流作用下での細粒分の抜け出し実験で得られた乾燥かさ密度の変化による限界Shields数が適用されるように改良した.また,水理学実験の再現計算を実施した結果,細粒分含有率が高くなると細粒分の抜け出しが遅延されることで混合土砂の地形変化が減少されることが明らかとなった.
    2020年度の研究目標である混合土砂の土砂割合(細粒分含有率)が混合土砂の移動特性に及ぼす影響について,細粒分含有率の変化による混合土砂における細粒分の抜け出し特性に着目した水理模型実験を実施した.海外の様々な研究では,砂と細粒分(粘土+シルト+海洋有機物)からなる混合土砂の移動限界が混合土砂の乾燥かさ密度(Bulk density)に依存することが判明しており,本研究においても乾燥かさ密度の観点から検討を行った.その結果,実験に用いた土砂の乾燥かさ密度実験を実施することで,細粒分含有率の変化による乾燥かさ密度を算定する評価式が得られた.また,混合土砂モデルにおいて,既存のモデルでは,細粒分の変化によって混合土砂の空隙が変化する手法になっていたため,細粒分含有率の変化による乾燥かさ密度の評価ができなかった.そのため,細粒分含有率の変化によって実験から得られた乾燥かさ密度の評価式が適用できるように数値モデルを改良した.その後,波浪場における混合土砂の地形変化を検討した水理模型実験の再現計算を実施し,実験と類似な傾向が確認された.したがって,当初の研究計画の通りにおおむね遂行できたと考えられる.
    2021年度では,砂と礫からなる混合土砂の移動特性を砂と細粒分からなる混合土砂の計算手法を改良して評価できるように数値手法を開発する.当初計画では,2020年度と同様に一様流における水理模型実験を実施し,砂含有率による礫の移動限界変化を検討する予定であった.ただし,混合土砂モデルにおいて,地形変化を計算するためには,斜面崩壊による混合土砂の地形変化の再現計算が重要であることがわかった.そのため,当初の計画した実験の前に,水中における砂と礫からなる混合土砂の斜面崩壊実験を実施し,砂含有率の変化による水中での安息角と場所による砂の含有率の変化を測定する.その後,混合土砂モデルの改良・再現計算によってモデルの精度を検討する.斜面崩壊における数値計算の妥当性が確認されてから,当初研究計画である砂と礫からなる混合土砂の移動限界実験を実施する予定である.

  2. Development of numerical model of mixed soil considering the cohesive force of clay

    Grant number:16K18156  2016.4 - 2019.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists(B)

    CHO Yonghwan

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    Authorship:Principal investigator 

    Grant amount:\2600000 ( Direct Cost: \2000000 、 Indirect Cost:\600000 )

    This study presents the method to calculate sediment transport of mixed soil consisting of sand and clay based on the influence of clay loss from mixed soil bed on the initial motion of mixed soil. Two-dimensional laboratory experiments were conducted to investigate the characteristics of clay loss from mixed soil with the different wave conditions and the clay contents, and the characteristics of the spatial distribution of clay after the change of topography. In addition, based on the experimental results, the sediment transport model of mixed soil in the consideration of the clay loss phenomenon attributing to the change of the clay content was proposed and the validation and the sensitivity analysis of the model were examined.

  3. Mechanism of tsunami-induced erosion of bridge-abutment backfill and effectiveness of countermeasures

    Grant number:18K04364  2018.4 - 2021.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Nakamura Tomoaki

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    Authorship:Coinvestigator(s) 

    The mechanism of tsunami-induced erosion of bridge-abutment backfill and effectiveness of countermeasures were investigated using hydraulic experiments and numerical simulations. Experimental results showed that the backfill close to the abutment was eroded and the backfill on the far side of the abutment remained relatively intact, which was a similar phenomenon to that observed after the 2011 Tohoku earthquake tsunami. From comparison with experimental data, the computational capability of the numerical model, FS3M, was demonstrated in terms of water surface fluctuation and surface profile change in the backfill. From numerical results, the process in which the backfill inside the abutment flowed out from under the landward wing was observed and the mechanism of the process was revealed in terms of bedload and suspended load transport. From numerical experiments, an increase in the soil-cover depth of the wing would be effective against the erosion of the backfill.

 

Teaching Experience (On-campus) 52

  1. Fundamentals of Hydrodynamics with Exercises

    2021

  2. Experimental and Analytical Training in Civil Engineering

    2021

  3. Seminar on Coastal and Maritime Engineering 1B, 2B

    2021

  4. Seminar on Coastal and Maritime Engineering 1A, 1C, 2A, 2C, 2E

    2021

  5. Advanced work in coastal and offshore engineering

    2021

  6. Experimental and Analytical Training in Civil Engineering

    2020

  7. Experiments in Hydraulics

    2020

  8. Fundamentals of Hydrodynamics with Exercises

    2020

  9. Mathematics I and Tutorial

    2020

  10. Seminar on Coastal and Maritime Engineering 1D

    2020

  11. Seminar on Coastal and Maritime Engineering 1C

    2020

  12. Seminar on Coastal and Maritime Engineering 1B

    2020

  13. Seminar on Coastal and Maritime Engineering 1A

    2020

  14. Advanced work in coastal and offshore engineering

    2020

  15. 水理学演習

    2019

  16. Experiments in Hydraulics

    2019

  17. Seminar on Coastal and Maritime Engineering 1A, 1C, 2A, 2C, 2E

    2019

  18. Fundamentals of Hydrodynamics with Exercises

    2019

  19. Advanced work in coastal and offshore engineering

    2019

  20. Experimental and Analytical Training in Civil Engineering

    2019

  21. Seminar on Coastal and Maritime Engineering 1A, 1C, 2A, 2C, 2E

    2018

  22. Seminar on Coastal and Maritime Engineering 1B, 1D, 2B, 2D

    2018

  23. Advanced work in coastal and offshore engineering

    2018

  24. Experimental and Analytical Training in Civil Engineering

    2018

  25. 水理学演習

    2018

  26. Experiments in Hydraulics

    2018

  27. Global Research Internship 1

    2018

  28. Global Research Internship

    2018

  29. Global Research Internship 2

    2018

  30. Global Environmental Leaders Seminar

    2018

  31. Fundamentals of Hydrodynamics with Exercises

    2018

  32. Seminar on Coastal and Maritime Engineering 1A, 1C, 2A, 2C, 2E

    2017

  33. Seminar on Coastal and Maritime Engineering 1B, 1D, 2B, 2D

    2017

  34. Global Environmental Leaders Seminar

    2017

  35. Advanced work in coastal and offshore engineering

    2017

  36. Experimental and Analytical Training in Civil Engineering

    2017

  37. 水理学演習

    2017

  38. Experiments in Hydraulics

    2017

  39. Global Research Internship 1

    2017

  40. Global Research Internship

    2017

  41. Global Research Internship 2

    2017

  42. Experiments in Hydraulics

    2016

  43. 水理学演習

    2016

  44. Seminar on Coastal and Maritime Engineering 1A, 1C, 2A, 2C, 2E

    2016

  45. Seminar on Coastal and Maritime Engineering 1B, 1D, 2B, 2D

    2016

  46. Advanced work in coastal and offshore engineering

    2016

  47. 水理学演習

    2015

  48. Experiments in Hydraulics

    2015

  49. Seminar on Coastal and Maritime Engineering 1A, 1C, 2A, 2C, 2E

    2015

  50. Advanced work in coastal and offshore engineering

    2015

  51. Experimental and Analytical Training in Civil Engineering

    2015

  52. Seminar on Coastal and Maritime Engineering 1B, 1D, 2B, 2D

    2015

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Teaching Experience (Off-campus) 1

  1. 特別活動,基礎実験Ⅱ,卒業研究

    2019.4 - 2020.3 Gifu National College of Technology)

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    Level:Undergraduate (specialized)  Country:Japan

 

Social Contribution 7

  1. オープンキャンパス2019

    2019.8

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    Audience: Junior students, High school students, College students, Graduate students, Teachers, Guardians, Researchesrs, General

    Type:University open house

  2. オープンキャンパス2018

    2018.8

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    Audience: Junior students, High school students, College students, Graduate students, Teachers, Guardians, Researchesrs, General

    Type:University open house

  3. オープンキャンパス2017

    2017.8

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    Audience: Junior students, High school students, College students, Graduate students, Teachers, Guardians, Researchesrs, General

    Type:University open house

  4. テクノ・フェア名大2016

    2016.9

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    Audience: General

    Type:Other

  5. オープンキャンパス2016

    2016.8

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    Audience: Junior students, High school students, College students, Graduate students, Teachers, Guardians, Researchesrs, General

    Type:University open house

  6. 建設技術フェア2015 in中部

    2015.10

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    Audience: Infants, Schoolchildren, Junior students, High school students, College students, Graduate students, Teachers, Guardians, Researchesrs, General, Scientific, Company, Civic organization, Governmental agency, Media

  7. オープンキャンパス2015

    2015.8

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    Audience: Junior students, High school students, College students, Graduate students, Teachers, Guardians, Researchesrs, General

    Type:University open house

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