2019 Fiscal Year Final Research Report
Understanding and predicting the sediment transport and morphodynamics using bedload tracer model
| Project/Area Number |
17K14734
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Hydraulic engineering
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| Research Institution | Hokkaido University (2019)
Public Works Research Institute (2017-2018) |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | 土砂動態 / 地形変動 / 土砂トレーサー / 掃流砂 / 蛇行 / 砂州 / 河岸侵食 |
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| Outline of Final Research Achievements |
This study propose a numerical model for directly simulating large-scale sediment dynamics, such as spatiotemporal scale of sediment transport and its effect on the morphodynamics, using bedload tracer transport model. The proposed model has been verified using laboratory and field-scale experiments regarding the tracer advection-dispersion, showing generally reasonable performance to reproduce both morphodynamic process and tracer transport dynamics. We discuss the relation between the tracer transport process and morphological changes of river bed, for instance, sandbar formation, bank erosion and meandering, in detail using the proposed model. The proposed model and results contribute to new framework capturing large-scale sediment transport dynamics.
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| Free Research Field |
水工学
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| Academic Significance and Societal Importance of the Research Achievements |
流域内における土砂動態は，平常時の物質輸送に大きく影響することで自然環境中の生態系に寄与するとともに，洪水時には大量の土砂生産により下流域の大規模河床変動を誘発して河川災害の原因ともなる．一方，これら土砂動態は直接的に測定することは極めて困難であり，数値的に表現せざるを得ない．本研究で構築した土砂トレーサーモデルは，土砂動態を従来モデルよりも直接的にとらえることが可能であり，土砂動態―地形変動現象の理解を容易にし，上記のような現象を予測可能とすることで，その解決策の提案に寄与するものである．
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