Water conveyance losses for canal lining in the Yellow River irrigation area is one of the key parameters for water rights transfer in Ningxia,which determines the quantity of water-saving and water-saving project scale. The calculation of conveyance losses of irrigation canal was discussed in this paper. The dynamic water method and still water measurement were used to estimate the water conveyance losses before and after canal lining respectively. The results of dynamic water method show that 0. 054 m3/s. km of the water conveyance losses is reduced in the main canal,which accounts for 55% of water conveyance losses before canal lining. Water conveyance losses are reduced in branch canal,which accounts for 56% of water conveyance losses before canal lining. The results of still water measurement show that infil-tration intensity of canal lining in lateral canal is 27% of earth canal,which means that 73% of the water conveyance losses can been re-duced.%衬砌渠道减少输水损失量是宁夏水权转让水量计算的关键因子，关系到节水量的计算、节水工程规模的确定等。采用动水法和静水法相结合的方式对宁夏灌区典型区衬砌渠道减少输水损失量进行估算，动水法试验结果表明：干渠衬砌后减少渗漏损失量为0．054 m3／（s·km），占未衬砌渠道渗漏损失量的55％，支、斗渠衬砌后减少的渗漏损失量占未衬砌渠道渗漏损失量的比例与干渠相当，约为56％；静水法试验结果表明：斗渠衬砌后渗漏强度是土渠渗漏强度的27％，即通过衬砌可减少73％的渗漏损失量。
展开▼
