悬移质取样垂线流量权重法测定断面平均含沙量的应用研究

Application of the vertical discharge weighting method in determining the cross-section mean sediment concentration

实测部分流量的悬移质输沙率法测定断面平均含沙量,输沙率和流量测验必须同步进行,与新仪器设备的测验原理及不断变化的测验环境不相适应,应用取样垂线流量权重计算断面平均含沙量,将可达到简化断面平均含沙量测验程序、提高泥沙测验时效性的目的。本文分析了悬移质取样垂线流量权重法(系数法)测定断面平均含沙量的原理和应用条件,实例研究了悬移质取样垂线流量权重法(系数法)测定断面平均含沙量符合流量加权原理和河流含沙量在断面上的分布规律,具有很好的推广应用价值。

In determining the cross-section mean sediment concentration based on the method of partial observed discharge, the measurements of suspended sediment discharge and flow discharge must be conducted synchronously, which doesn＇t fit to the measuring principles of the new instruments and the constantly changing measuring environments. To simplify the measurement of the mean sediment concentration and improve time effectiveness, the vertical discharge weighting method for samples is used. In this paper, the authors analyzed the principle and application conditions of the vertical discharge weighting method for determining the mean sediment concentration. Results from the examples indicated that the calculated sediment concentration by the vertical discharge Weighting method is coincident to the discharge-weight principle and the sediment concentration distribution regularity at a cross-section. It is very valuable for popularization and utilization.