北江清远河段推移质运动规律初步研究

Preliminary study on bed load movement for Qingyuan reach in Beijiang River

采用理论分析、变坡水槽试验与实体模型试验相结合的研究方法,针对北江清远河段推移质泥沙特性及运动特性,进行了泥沙起动及输移的水槽试验,并对泥沙的起动与输移规律进行了初步研究。根据起动试验结果,得出了反映颗粒隐蔽和暴露作用的隐暴系数表达式;根据输移试验结果分析了推移质输沙率的特性,并通过与其它公式进行比较,得到适应于该河段的推移质输沙率公式。

Based on the theoretical analysis together with experiment in laboratory flume and physical model, an experiment study on incipient motion and transport rate of the bed load has been conducted in laboratory flume according to the sediment characteristics in Beijiang River. From these results, this paper has analyzed the laws of sediment incipient motion and transport. Non-uniform bed materials and their mutual influences have been accounted by a hiding-protruding coefficient and corresponding expression. Nowadays, the results obtained by many formulas for non-uniform sediment transportation are too difficult to get the same value. This paper has studied the features of bed load transport rate of non-uniform sediment for Qinyuan reach in Beijiang River, as well as established its calculating formula.