微灌用沉沙池泥沙沉降计算方法试验研究

对沉沙池设计中最常用的准静水沉降法和一维流超饱和输沙法进行了比较研究,得到了该两种方法用于微灌沉沙池设计中的参数变化范围,并对其中的紊动修正系数K和恢复饱和系数a进行了专门试验研究,得出了K和a的计算公式和适用条件.试验结果表明:准静水沉降法的计算误差较大,但在一定范围内,可以满足精度要求,用来估算沉沙池池长;一维流超饱和输沙法计算简单并且具有较好的计算精度,可以用于微灌用沉沙池的工程设计计算.

Experimental Study on Calculation Method for Sand Sedimentation in Sedimentation Basin for Micro Irrigation System

The two commonly-used calculation methods for sedimentation basin design, namely the quaskhydrostatic deposition method and the one dimension supersaturated sediment transport method, are studied in this paper. The change ranges of parameters of the two above methods, which are applicable to sedimentation basin design for micro irrigation system, was obtained. Moreover, the turbulence modified coefficient and the recovery saturated coefficient are studied specially through experiment, and their applicable condition and calculation formulae are obtained, too. The experimental results indicate that the quasi-hydrostatic deposition calculation method has bigger error, but it can be used to estimate the length of sedimentation basin in certain precision range. While the one dimension supersaturated sediment transport method has better calculation precision, and can be used for calculation of sedimentation basin design for micro irrigation system.