陕西关中位于黄土区,绝大部分渠道的渗漏量都很大,渠系有效利用系数一般在50%左右,有的甚至仅达30～45%。这不仅浪费了大量水量,而且引起地下水位不断上升,导致灌区次生盐碱化面积的逐年扩大。因此,如何防止或减少渠道的渗漏损失,以扩大灌溉面积,提高灌溉保证率,防止土壤次生盐碱化,就成 Shaanxi Guanzhong is located in the loess area. Most of the channels have a large amount of leakage, and the effective drainage coefficient is about 50%, and some even reach 30-45%. This not only wastes a lot of water, but also causes the groundwater level to rise continuously, resulting in the year-by-year expansion of the secondary salinization area in the irrigation area. Therefore, how to prevent or reduce the seepage loss in the channel, in order to expand the irrigated area, improve the irrigation guarantee rate and prevent the secondary salinization of the soil.