考虑溯源冲刷的一维水沙数学模型拓展及应用  

Improvement and application of onedimensional numerical model of flow and sediment with retrogressive erosion

作　　者：余明辉[1] 祝求 杨国录[1] 胡鹏[1] YU Ming-hui;ZHU Qiu;YANG Guo-lu;HU Peng(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430012,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《泥沙研究》2021年第2期1-6,共6页Journal of Sediment Research

基　　金：国家自然科学基金项目(11972265);国家重点研发计划项目(2016YFC0402604)。

摘　　要：针对多沙河流水库淤积体存在的溯源冲刷现象及泥沙运动特点,在一维非饱和输沙数学模型的基础上,拓展添加溯源冲刷计算模块,以下边界水位及输沙量突变为判别条件,提出溯源冲刷基准面、冲刷比降及冲刷泥沙量的计算方法,实现溯源冲刷与常规沿程冲淤计算自动优选功能。经与某多沙水库溯源冲刷过程实测资料对比表明,对于存在溯源冲刷的河段,拓展模型计算快捷,结果符合实际,能正确反映溯源冲刷物理过程。Based on the characteristic of retrogressive scour and the one-dimensional numerical model of non-equilibrium transportation of sediment,the retrogressive scour calculation block is set up which takes an abrupt change of downstream boundary water level and sediment discharge as critical conditions. The calculation methods of base level of retrogressive scour,scouring slope and sediment discharge are proposed,which make automatic optimization function of retrogressive scour and common scour and deposition along the flowing path.Based on comparison between the observed date of a sediment-laden reservoir which has retrogressive scour,the numerical results show that compared with the conventional model,the expand model is in much better agreement with observed results,which could reflect physical phenomenon correctly.

关 键 词：溯源冲刷 下边界水位 水沙数学模型 冲刷基准面 

分 类 号：TV145.1[水利工程—水力学及河流动力学]