考虑溯源冲刷中河岸展宽的一维水沙数学模型研究  

One-dimensional numerical model on flow and sediment with channel widening during retrogressive scour

作　　者：祝求 余明辉[1] 马喜祥[2] 杨国录[1] ZHU Qiu;YU Ming-hui;MA Xi-xiang;YANG Guo-lu(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;China Water Resources Beifang Investigation,Design and Research Co.Ltd,Tianjin 300222,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 [2]中水北方勘测设计研究有限责任公司,天津300222

出　　处：《泥沙研究》2021年第4期15-20,共6页Journal of Sediment Research

基　　金：国家自然科学基金项目(11972265)。

摘　　要：溯源冲刷是河道或水库下边界水位急剧下降而导致的一种自下而上的强烈冲刷现象,常伴随着河岸崩塌展宽。基于河岸展宽现象及其运动特点,在考虑溯源冲刷的一维非饱和输沙数学模型的基础上,拓展添加河岸展宽计算模块,以相关经验公式为判别条件,提出河岸展宽的计算方法,实现河岸展宽、溯源冲刷与常规沿程冲淤计算自动优选功能。经与某多沙水库实测资料对比表明,对于存在溯源冲刷且伴随河岸展宽的河段,拓展模型计算结果在出库沙量、河床纵剖面及横断面形态等方面与实测资料吻合更好。Retrogressive scour is caused by sharp drop of water level in a river or a reservoir,which process is often accompanied by channel widening.A one-dimensional numerical model of non-equilibrium sediment transportation based on the characteristics of channel widening was adapted.The channel widening calculation block is set up which takes related formula as critical condition,the calculation methods of channel widening is proposed which makes automatic optimization function of channel widening,retrogressive scour and deposition along the reservoir.Based on compare with the observed date of a sediment-laden reservoir which has retrogressive scour and typical channel widening,the results show that the expand model is in much better agreement with measured results on amount of sand discharged from the reservoir,on relationship between water level and storage capacity,and on the longitudinal profile of the river bed.

关 键 词：溯源冲刷 河岸展宽 水沙数学模型 

分 类 号：TV145.1[水利工程—水力学及河流动力学]