日平均输沙率96加权法改进探讨

Discussion on Improving 96 Weighted Mean Method of Calculating Daily Mean Sediment Discharge

本文对一日内流量和含沙量变化都较剧烈时计算日平均输沙率的96加权法进行了分析研讨,找出了这一方法的主要问题是时段平均含沙量并非是由流量加权而得,而是由时段首、末的两个含沙量的算术平均值当做时段平均含沙量,这就导致了所得时段输沙量含有一定的算式误差。针对这一方法中的问题进行了必要的改进,建立了另一计算日平均输沙率方法—日平均输沙率面积包围法。

This paper analysed 96 weighted mean method of calculating daily mean sediment discharge,which is often used when both discharge and sediment discharge change acutely in one day.It has been found that the problem of this method is the value of mean sediment concentration of time interval,that is,choosing rithmetic average as the value of mean sediment concentration of time interval but not discharge weighted mean.This method has been led to the value of mean sediment concentration of time interval has certain equation error.In view of this problem,this method has been improved and another method has been built,i.e.the area surrounds method to calculate daily mean sediment discharge.