大兴迭隆起地区岩溶水为北京市地下水资源的重要组成部分。为了查明南苑-通县断裂以及永定河断裂的水文地质性质，以大兴迭隆起地区隐伏岩溶水系统为研究对象，利用GMS地下水流数值模拟软件，建立了岩溶地下水系统模型。分别将研究断层设置为侧向隔水边界和侧向透水边界的条件进行模拟计算，对比分析了不同水文地质条件下观测水位与模拟水位的拟合效果，结合水量均衡分析表明，南苑-通县断裂、永定河断裂均为侧向隔水性质的断裂，研究区岩溶含水层主要接受主要来源于上覆第四系松散层的垂向越流补给。研究表明，数值模拟法在研究隐伏型岩溶含水系统水文地质条件具有一定的优势。

In the overlapping uplift area of Daxing, the karst water is a significant component of groundwater resources in Beijing. In order to characterize the hydrogeological conditions of Nanyuan-Tongxian fault and Yongding River fault, a groundwater flow model was developed to simulate the covered karst system in the overlapping uplift area of Daxing using the groundwater numerical simulation software GMS. Both faults were simulated as the impervious boundary and permeable boundary in the model. The fitting effect between observed and simulated heads and water balance of the system were analyzed under the two conditions, which indicated that both faults are impervious fault. T he recharge of karst water aquifer is the leakage from overlying Quaternary porous aquifer. The research shows that numerical simulation method has advantages in the study of hydrogeological conditions of covered karst system.

国家“973”计划项目（2010CB428804）；北京岩溶水资源勘查评价工程，专题类第一项：数值模拟（BJYRS-ZT-01-01）