定床变弯度曲流河边滩的水槽模拟实验

Flume Simulation about Point - Bars of Variable Curve Coefficience Meadering River in Fixed Bed

设计了一条河床及河岸为固定且河段曲率由上游至下游逐渐增大的入湖曲流河道，采用３组不同粒径的沙粒进行曲流河边滩模拟实验，详细研究了不同粒径条件下定床曲流河的边滩分布特征。结果表明，曲流河边滩的分布、规模、形态及水动力特征均与河流弯曲系数关系密切：随着曲率增大，边滩上顶点向上游移动，边滩外缘的水下倾角也随之增大，边滩形状则由长条形到非对称弧形到对称弧形．

A fixed bed channel which the curve coefficience increases gradually was designed. Three groups of different sand in diameter are used to examine the distribution of the point bars in the meadering river. The results show that the distribution, shape, position of upperstream top point and the outer fringe dip of the point bars relate to the curve coefficience of the river.