渠床土壤二维稳定入渗率实验及渗漏损失计算

Experiment of Steady Two-Dimensional Infiltration Rate of the Soil in the Canal Bed and the Calculation of Seepage Losses

本文针对干旱地区、连续供水的大中型灌区渠道效率评估需要,用保角映射原理简化稳定入渗率的实验计算式;在克服渠床土壤空间变异性影响、改进国外的分离式静水套坑法为合一式静水套统、测定二维稳定入渗率实验法,求得一维流稳定入渗率的二维改正系数r;结合理论计算,可简便求得渠道渗漏损失用于输水效率评估。

According to the requirement for evaluating the canal water efficiency of large or middle size irrigation system operating continuous in the arid area, we get the two-dimensional correction coefficient of steady one dimensional infiltration rate using the conformal mapping method to simplify the formula of the steady infiltration rate and using the improvement io the field test working method which used at abroad.Combining it with the theoretical calculating method, it could be simply to estimate the theoretical conveyance efficiency of the distributry canal. It was helpful 10 evaluate the management goal of the channel efficiency and analyse how to incease the efficiency. The testing principle and calculating method of the conveyance losses of the two-dimensional flow were mainly studied and investigated in this paper.