基于GMS的北京市房山平原区地下水数值模拟研究

Groundwater Numerical Simulation on Plain Area in Fangshan District of Beijing on GMS Model

根据北京市房山平原区的水文地质条件,将研究区水文地质概念模型概化为三维非均质、各向同性、非稳定地下水流系统,并应用GMS软件对研究区地下水系统进行了识别和验证。采用情景分析方法,在模拟8种不同情景方案下规划年地下水的变化情况,给出适宜研究区地下水可持续发展的最佳方案。在情景5方案,即在中度节水、种植结构保持现状和强化减少地下水的情形下,研究区2020和2030年的地下水位处于最佳状态,相比于基准年,地下水位分别回升了3.55m和5.85m,研究区处于正均衡状态,降落漏斗消失。

Based on an analysis of the hydrogeological conditions on the plain area in Fangshan district of Beijing, the hydrogeological concept model is conceptualized as a 3-D heterogeneous, isotropic and unstable groundwater flow system. By using GMS（Groundwa- ter Modeling System） software, numerical simulation of groundwater flow in this area is carried out. After identification and verifica- tion of the model, eight different scenarios are set up to analyze the changes in groundwater under the planning year, the best solu- tion suitable for the sustainable development of groundwater in this area is found. The results show that the water table is the best by moderate water-saving, the present planting structure and intensified reduction groundwater overexploitation（scenario 5）. Compared with the water table in 2005, it will raise 3.55 m and 5.86 m respectively.