潮白河生态补水对地下水影响的模拟预测

Simulation and prediction of the impact of ecological water supplement of Chaobai River on groundwater

2021年春季,北京市启动潮白河实验性生态补水,补水总量2.2亿m^(3)。为查明潮白河生态补水对地下水影响特征,通过地层概化、源汇项识别,构建了北京市平原区地下水数值模型,根据现状补水情况,模拟预测了年末潮白河周边地下水变化情况。结果表明:至2021年末,与未补水对比,地下水上升影响范围约为600 km^(3)。地下水抬升最大幅度出现在牛栏山橡胶坝,地下水总储量增加了1.96亿m^(3),其中,水源地范围内地下水储量增加了1.03亿m^(3)。预测了地下水位抬升情况及影响范围,有助于明确地下水位是否超过控高水位的区域,可对补水优化方案提供借鉴。

In the spring of 2021,Beijing initiated the experimental ecological replenishment of the Chaobai River,with a total water supply of 220 million m^(3).In order to find out the characteristics of the impact of the Chaobai River’s ecological replenishment on the groundwater,this paper constructs a groundwater numerical model in the Beijing plain area to simulate and predict the changes of the groundwater around the Chaobai River at the end of the year.The results show that by the end of 2021,the impact range of groundwater rise is about 600 km^(3).The total groundwater reserves have increased by 196 million m^(3).The groundwater reserves have increased by 103 million m^(3).This paper predicts the rise of the groundwater level and the scope of its influence,which is helpful to determine whether the groundwater level exceeds the area where the high water level is controlled,and can provide a reference for the optimization of water replenishment schemes.