2021 Fiscal Year Final Research Report
Developing a hillslope water flow model considering soil heterogeneity and analysis of hydraulic scaling structures
| Project/Area Number |
19K04614
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22040:Hydroengineering-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 土壌特性 / スケール構造 / マイクロスケール / メソスケール / 流量流積関係式 / 準二次元モデル |
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| Outline of Final Research Achievements |
The results of this study are as follows. First, a rainwater flow model was developed that takes into account both small and large pore spaces in mountain soils. Then, the model was simulated under various conditions, and the relationship between the depth-discharge relationships obtained from the simulation results and the soil moisture profile in the topsoil layer was analyzed. The results revealed that the vertical soil moisture profile has a strong influence on the water flow in the slope direction. This suggests the importance of explicitly considering vertical rainwater movement in rainfall-runoff modeling. Based on this finding, a quasi-two-dimensional hillslope water model was developed and compared with the results of a two-dimensional model, which showed good agreement between the two.
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| Free Research Field |
土木工学
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| Academic Significance and Societal Importance of the Research Achievements |
土壌の不均質性は山地域の雨水流動に大きく影響するが、土壌の不均質性の効果を織り込みつつ河川流域全体に適用可能な降雨流出モデルは開発されていない。本研究では、土壌の不均質性を考慮して山地斜面の雨水流動を計算する詳細なモデルを開発し、このモデルの計算結果に基づいて、山地斜面の水深と流出量の関係について分析した。その結果、土壌水分が表土層の深さ方向にどのように分布するかが斜面からの流出量に強く影響することが明らかとなった。この知見に基づいて、山地域からの流出量を効率よく計算するモデルを開発した。このモデルは山地域での雨水の動きをよく表現するものであり、洪水や土砂災害の予測に貢献できる可能性がある。
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