南水北调供水前后北京西郊地区地下水流场趋势预测研究

本文对北京西郊南水北调受水区进行了地下水数值模拟和流场趋势预测，为其地下水合理开发利用提供了依据。首先建立了研究区水文地质概念模型，将模型概化为潜水含水层和承压含水层。运用地下水模型软件GMS建立了地下水数值模拟模型，并对模型进行了模拟和预测。预测结果表明，在南水北调供水前，地下水位持续小幅下降；南水北调供水后，地下水储存量增加了4．2×10^8m3，地下水位平均上升幅度为6．24m。其中，在研究区北部地下水集中开采区地下水上升幅度最大，一般为8—10m，在研究区南部上升幅度较小，一般为3～4．5m。

Prediction of groundwater flow field in the west suburb of Beijing before and after the South-to-North Water Diversion

This study predicts the trend of groundwater flow field in the west suburb of Beijing and provides a scientific base for the reasonable exploitation of water resources in this area. Firstly, a conceptual model of study area was built in which the groundwater system was simplified to unconfined aquifer and confined aquifer. Secondly, the groundwater system was numerically simulated and predicted by a groundwater modeling software （GMS）. According to the simulation results, groundwater table in the study area will decline continuously before getting water supply from the Seuth-to-North Water Diversion Project. The water supply from South-to-North Water Diversion Project will lead to an increase in groundwater storage of 4.2×10^8 m3 and a raise in groundwater level of 6.24m in average. A water level increase of 8 to 10 m in the intensive exploitation zone of northern study area and a water level increase of 3 to 4.5m in the southern part can be expected.