| Project/Area Number |
18K13842
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 22040:Hydroengineering-related
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| Research Institution | Public Works Research Institute |
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Principal Investigator |
Harada Daisuke 国立研究開発法人土木研究所, 土木研究所(水災害・リスクマネジメント国際センター), 研究員 (30795802)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 中山間地河川 / 流路・河床変動 / 流木 / 微細土砂 / 平面二次元洪水流解析 / 流砂・河床変動 / 平面二次元洪水流 / 土砂動態 |
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| Outline of Final Research Achievements |
The present study developed methods to analyze the behavior of driftwood in terms of the convection-diffusion equation, and methods to evaluate the erosion rate of bed sediment composed of fine sediment by means of entrainment velocity. The proposed methods were tested by a series of flume experiments, and they were introduced in the depth-integrated 2-D flow model. The methods were applied to analyze the three flood disasters that happened in mountainous rivers in Japan from 2017 to 2019. As a result, we proposed methods to analyze flood flow with a huge amount of sediment and driftwood, where the sediment and driftwood cause the bed deformation and that also affects the characteristics of flood flow.
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| Academic Significance and Societal Importance of the Research Achievements |
2017年の九州北部豪雨における赤谷川，2018年の西日本豪雨災害における総頭川，2019年の東日本豪雨における五福谷川といった，中山間地河川において近年頻発する所謂「土砂・洪水氾濫」では，上流から多量の微細土砂や流木が供給された結果，下流域に甚大な被害をもたらしている．本研究の成果によって，これらの現象を数値シミュレーションで解析することが可能になり，今後の中山間地河川河道計画や避難計画，災害の復旧等に貢献するものである．
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