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| Hydro-sediment-morphodynamic modeling of riverbed evolution and calculation of dredging volume |
Peng HU1( ),Shao-yi DENG1,Zi-xiong ZHAO1,Zhi-xian CAO2,Huai-han LIU3,Zhi-guo HE1 |
1. Ocean College, Zhejiang University, Zhoushan 316021, China
2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
3. Technology Department, Changjiang Waterway Bureau, Wuhan 430010, China |
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Abstract A two-dimensional hydro-sediment-morphodynamic model was applied to simulate the evolution of bar and channel in the Dongliu waterway of lower Yangtze River and compute the dredging volume in order to improve the accuracy of dredging volume estimation. The main erosion/deposition characteristics of the Dongliu waterway in response to the 2010 flooding process were successfully reproduced. The error between the computed dredging volume and the actual data in Xigang channel is small. The main factors affecting the uncertainty of computed dredging volume were analyzed. Results show that the computational grid size greatly impacts on the computed dredging volume. When the grid size is approximately equal to or smaller than the measured topography data interval, the computed dredging volume is consistent, otherwise grid size brings great uncertainty to the computation of dredging volume. The volume fraction of inflow sediment greatly impacts on the computed dredging volume.
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Received: 31 October 2020
Published: 07 May 2021
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| Fund: 长江航道局重点科研资助项目（K16-529112-016）；国家自然科学基金资助项目（11772300）；浙江省自然科学基金资助项目（LR19E090002） |
基于水沙床耦合的滩槽冲淤模拟与疏浚量计算
为了提高疏浚量的预报准确度，将平面二维水沙床耦合数值模型应用于长江下游东流水道的滩槽演变和疏浚量计算，成功复演了2010年大水作用下主要的滩槽冲淤特征，西港航槽内计算疏浚量与实测疏浚施工方量的误差较小. 分析影响疏浚量计算不确定性的主要因素. 结果表明，计算网格尺寸对计算疏浚量有较大的影响，当网格尺度约等于或小于实测地形数据间隔时，计算疏浚量较一致，否则网格给疏浚量计算带来较大的不确定性；进口泥沙体积分数对计算疏浚量的影响较大.
关键词：
水沙床耦合模拟,
疏浚量,
长江航道,
河床演变
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