沉沙池设计中确定泥沙沉降率综合系数α的方法

A Method for the Determination of Sedimentation Integrated Coefficient α in the Design of Sediment Detention Basin

在水利工程沉沙池的设计中，常采用的计算泥沙沉降的方法为一度流超饱和输沙法。泥沙沉降率的计算最关键的问题之一是要确定综合系数α值。通常，把α值近似视为常数，或虽采用一些经验公式，但只适合某些特殊情况。在一般情况下，α值与泥沙沉速、水深、摩阻流速等有关，是一个变值。笔者根据山东省打渔张灌区第５条渠的实测资料，采用多元回归分析法，推求出求α值的经验公式。并通过进行方差分析和对回归方程显著性的判断，以及用实测资料对α值验证计算比较后，认为采用多元回归分析法确定沉沙池泥沙沉降率综合系数α值的经验计算公式是可行的，可以满足设计要求。

In the design of sediment detention basin in hydraulic engineering, the method usually used for the calculation of silt sedimentation is the method of super saturated sediment transport in one dimension flow, and one of thekey points of silt sedimentation rate computation is the determination of integrated coefficient Q. Usually, α- valueis assumed approximately as a constant or taken from some empirical formulae which are only suitable for some special conditions. In common cases, α-value is related to the velocity of silt sedimentation, depth and shear velocity,hence it is a variable. The authors, on the basis of measured data of Dayuzhang irrigated area, Shandong Province,used the methed of multiple-regression analysis to derived the empirical formulae of calculation of α-value through thevariance analysis and the test of significance in regression equation. It is concluded that the empirical formulae byusing the method of multiple-regression analysis to determine the value of silt sedimentation integrated cosefficient aare feasible and can satisfy the requirements of design.