金沙江下游支流河段推移质输沙率公式初探

Preliminary Study on Formulae of Bed Load Sediment Transport Rate in Downstream of Jinshajiang River

选取金沙江下游龙川江、小江、牛栏江3条典型支流,对其进行水槽平衡输沙试验,并分析总结现有的推移质输沙率公式,以计算该3条支流的推移质输沙率。将试验成果与计算结果进行对比分析,结果表明:①从公式立论基础上看,以能量平衡为主要理论依据的公式计算值偏大;②从公式形式上看,以河段比降为主要参数的公式计算值偏大;③综合考虑各水力要素,Ackers-White公式,Einstein-Brown公式和长江科学院输沙曲线,较适用于金沙江下游支流河段的推移质输沙率的计算。

Taking Longchuanjiang River, Xiaojiang River and Niulanjiang River as the typical tributaries of down- stream of Jinshajiang River, the equilibrium sediment transport flume experiments of the three tributaries were carried out. And then current formulae of bed load sediment transport rate were analyzed and summarized. On the basis of above study result, the bed load sediment transport rates Of the three typical tributaries were calculated. According to comparison between the experiment results and calculated data, the conclusions are as follows： The cal- culated results are relatively large whether they are calculated by the formulas derived on the basis of the energy- balance theory or the formula in which the slope of a river stretch is a major parameter. Taking all the hydraulic parameters into account, the Ackers-White formula, the Einstein-Brown formula and the sediment transport rate of bed load curve proposed by Yangtze River Scientific Research Institute are more suitable to such river reaches.