2023 Fiscal Year Final Research Report
Development of flood flow and riverbed variation analysis model using two-dimensional dispersive long wave equation
| Project/Area Number |
20K22427
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
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| Research Institution | Saitama University |
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Principal Investigator |
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| Project Period (FY) |
2020-09-11 – 2024-03-31
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| Keywords | 河床変動 / 河道内植生 / 二層流 / 浮遊物 / 個別要素法 / 浸透 |
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| Outline of Final Research Achievements |
Development of a highly accurate riverbed variation analysis for wide-area is needed to predict and examine potential flood risk areas and levee breaching points throughout an entire river basin. This study developed analysis methods for three points that have a significant impact on improving the accuracy of riverbed variation analysis: "infiltration into the floodplain", "washout of vegetation, transportation, and trapping of floating debris in the river channel during floods", and "riverbed variation around vegetation with different drag force characteristics in the vertical direction". The results show that the water level hydrographs during floods and trapping locations of floating debris can be analyzed with generally high accuracy, and scouring in front of vegetation zone can be analyzed. By further refining these analysis methods and integrating them into a unified model, it may be possible to predict both flood risk areas and levee breaching points.
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| Free Research Field |
水工水理学，水災害減災防災工学
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| Academic Significance and Societal Importance of the Research Achievements |
近年，洪水の頻発化や激甚化に伴い，治水面での河道管理が求められることに加えて，ネイチャーポジティブなど環境面にも配慮した河道管理が求められている．本研究で開発された解析手法は，樹木伐採等の河道管理を実施した前後における氾濫リスク箇所の評価等への活用が期待される．さらに，本研究で構築した洪水時の浸透解析手法を分布型降雨流出解析と連動させれば，洪水時だけでなく平水時の地下水位の検討ができる可能性もある．これは，渇水リスク評価などにも活用できる可能性があり，さらなる発展が期待される．
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