我国西北广大灌溉农业地区,由于排水不畅,不少农田地下水位逐年升高,引起土壤盐碱化,使农田减产,甚至被迫弃耕,危害甚大。地下水位升高而引起的土壤盐碱化,是灌溉地区夺取农业高产的主要障碍。内蒙河套灌溉地区这个问题很突出。河套平原北接阴山山脉,黄河流经南部,由于泥沙堆积河床增高,高于灌区地面,如乌兰市和平原地区比黄河引水口水面低4—23米,因此黄河基本上只能补给地下水,不能排泄地下水。地下径流在灌区下游及洼地汇 Due to the poor drainage in many irrigated agricultural areas in northwestern China, many groundwater tables have risen year by year, causing soil salinization, reducing farmland and even forced abandonment. Salinization of soil caused by an increase in groundwater level is a major obstacle to capturing high agricultural yields in irrigated areas. Inner Mongolia Loop irrigation area this problem is very prominent. Hetao plain north of the Yinshan Mountains, the Yellow River flows through the south, due to increased river bed sediment deposition, irrigation area above the ground, such as the Wulan City and plains than the Yellow River inlet 4-240 meters lower, so the Yellow River basically only recharge groundwater , Can not drain groundwater. Underground runoff in the irrigation area and depression sinks