汊道悬移质分沙模型

A model of suspended load diversion in branched channel

本文在考虑了分汊河道分流时横向环流作用的基础上，求出了汊道悬移质分组泥沙分沙比与分流比、分汊口附近地形的关系，以及全沙含沙量和级配等．应用该模型对荆江分流道以及长江上的一些分汊河道作了定性分析和验证计算，并与用其它模型计算的结果作了对比分析。

Considering the helical flow in the case of flood diversion of branched channel, this paper presents a model to calculate the diversion ratio of suspended load in different size groups in terms of the diversion ratio of water and the terrain condition nearby the branch, the total suspended load concentration, and the grain size distribution, etc. Using this model, the paper analyzes and calculates the sediment diversion ratio in some branched channels of the Yangtze River and the Jingjiang River, and contrasts the results with observed data and some results derived from other models. This model has a good agreement with the practical situation.