荆江微弯分汊浅滩的水沙输移及河床演变  

Discharge and sediment transporting and riverbed evolution in slightly curved and multi-branched river reach in Jingjiang reach

作　　者：江凌[1] 李义天[1] 葛华[1] 孙昭华[1] 

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

出　　处：《武汉大学学报（工学版）》2008年第4期10-13,19,共5页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:50609018)

摘　　要：沙市河段为长江中游典型长顺直微弯分汊河段,河床演变复杂.对该河段水流变化规律、河床冲淤模式进行了分析,探讨了来水来沙及河床形态对河道水沙输移的影响.河床冲淤由来水量、来沙量和河床形态共同决定,但河床形态与流量过程在更大程度上影响着河床冲淤特性,放宽段河床冲刷深度与单宽流量变化率之间较好的相关性便体现了这一点.考虑来流及河床形态的决定性作用,对该河段的主流摆动特性进行了分析,认为汊道兴衰交替是河床演变的主要特性.The Shashi reach is a slightly curved and multi-branched river reach with central bars in the middle reach of the Yangtze River, where the channel evolution is very complicated. This article analyzes the change characteristics of the water flow, the channel scouring/silting mode and the influence of the incoming water ＆ sediment and channel form on water ＆ sediment transporting in the reach. The channel scouring/silting is determined by incoming water, incoming sediment and channel form; but the influence of the channel form and the incoming water process is more significant, which also can be shown by the close relationship between the discharge variation rate and the scouring depth in widening reach. Based on these, the shift characteristics of the main flow in the reach are analyzed; it is found that the rise and decline of branches is the nature of the riverbed evolution in the Shashi reach.

关 键 词：河床形态 河床冲淤 水沙输移 河床演变 

分 类 号：TV147[水利工程—水力学及河流动力学]