南水北调东线一期工程对梁济运河段地下水影响研究

南水北调东线一期工程建成后,输水期间抬高沿线河水位,河水与地下水补排关系必将发生变化,对河道两侧地下水水位和水量产生一定的影响。根据梁济运河段的地貌、地质和水文地质条件,应用地下水非稳定运动数学模型,研究河渠渗漏对地下水水位的变化,从而分析预测影响区盐渍化情况。梁济运河在南水北调通水后,减小了两岸地下水埋深,影响范围约在500～1000m,地下水埋深减小为1.0～3.0m,地下水埋深均大于适宜临界埋深,但还存在盐渍化的潜在可能性。

The Impact of the First Stage in East-Route of South-to-North Water Transfer Project on Ground Water along Liangji Canal

After the construction of the first stage in East-Route of the South-to-North Water Transfer project, water table along the river will rise during the period of water transferring. The relationship between recharge and discharge of river water and ground water should change, which will affect the water quantity and the groundwater table in both sides of the channel. According to the geomorphology, geological and hydrogeology conditions of Liangji canal,mathematical model of unsteady groundwater flow was constructed to study the impact of leakage along the canal on the change of groundwater level,thus salinization in the affected zone was analyzed and predicted. After the draining of East Route of South-to-North Water diversion project,groundwater depth of Liangji canal would decrease by 1.0-3. 0m in the area of 500-1000m wide. Although the groundwater depth is higher than the critical value,there should be the possibility of salinization.