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Development of Advanced Sediment Replenishment Methodology for Bedload Continuity below Dams

开发先进的沉积物补充方法以确保大坝下方的床载连续性

基本信息

批准号：
21H01434
负责人：
カントウシュサメ・アハメド
金额：
$ 11.23万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2021
资助国家：
日本
起止时间：
2021-04-01 至 2024-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21H01434/
关键词：
土砂還元流砂連続性画像解析側岸侵食過程生態機能評価 Numerical simulation TELEMAC2D Model calibration Suspended sediment Buech River flood pulses Sediment pulses Replenishment Scenarios Sediment Replenishment Imaged- based-technique LSPIV and STIV

项目摘要

Installation of additional monitoring systems of two IP Cameras, one on the bridge and one on the left bank of the river, for real-time sediment erosion patterns at the sediment replenishment site and surface flow velocities near the SR site. Additionally, install one turbidity meter to measure suspended sediment concentration. In total, four times field surveys at Naka River for measuring Grain Size Distribution (GSD) along four gravel bars, a drone for the sediment replenishment site, and morphological changes. Field visit and data collection of Buech River in France. Develop a comprehensive assessment method for sediment replenishment in the Naka and Buch Rivers, considering the erosion efficiency of replenished sediment and downstream eco-hydro-geomorphological impacts. We established a two-dimensional model to simulate the hydro-morphological changes with the implementation of SR in the Naka River based on TELEMAC-2D coupled with Gaia. The model was then calibrated and validated for previous flood events and the 2022 flood event. Then, based on the calibrated model, we utilized it to simulate several scenarios to investigate the optimization strategies of SR by considering replenishment erosion and downstream responses. There are rare significant floods that occurred recently in the Nagayasuguchi dam, indicating that an increase in flushing magnitude is difficult to implement under dam management.

安装额外的两个IP摄像机监测系统，一个在桥上，一个在河的左岸，实时沉积物补充现场的沉积物侵蚀模式和SR现场附近的表面流速。此外，安装一个浊度计测量悬浮泥沙浓度。在纳卡河总共进行了四次实地调查，以测量沿着四个砾石坝的粒度分布（GSD）、沉积物补给点的无人机和形态变化。法国Buech河实地考察和资料收集。制定纳卡河和布赫河泥沙补充的综合评估方法，考虑补充泥沙的侵蚀效率和下游生态水文地貌影响。基于TELEMAC-2D和Gaia建立了二维模型，模拟了纳卡河实施SR后的水文形态变化。然后，该模型进行了校准，并验证了以前的洪水事件和2022年洪水事件。在此基础上，利用模型对几种情景进行了模拟，研究了考虑补给侵蚀和下游响应的SR优化策略。Nagayasuguchi大坝最近发生了罕见的重大洪水，表明在大坝管理下难以实施增加冲洗量。