顺直型与宽窄型复式河道水沙分布规律的比较

Comparisons of flow movement and sediment transport in straight and lotus root shape compound channels

本文在总结水槽试验资料的基础上，对顺直型及宽窄相间型复式河道的过流能力、流速及含沙量分布特性进行了比较分析。研究结果表明，两种复式河道的水沙分布具有一定的相似性，但也存在着较大的差别，并对其产生的原因进行了初步探讨。此外，通过比较滩槽流速比及滩槽流量比可以知道，宽窄复式河道的滩槽动量交换较顺直复式河道强烈。

In this paper, the distribution characteristics of discharge, velocity and sediment concentration in the straight and the lotus root shape compound channels are analyzed and compared by the data from flume experiments. There are some similarities and many differences for the flow movement and sediment transport in these two kinds of compound channels. In general, the momentum transfer between main channel and floodplain is stronger in the lotus root shape channel than that in the straight channel. Furthermore, some experimental relations of the relative velocity, the relative sediment concentration and the relative depth corresponding to the floodplain and mian channel are obtained.