郑州市地下水渗流场的数值模拟和优化管理

建立准三维数值模拟模型和优化管理模型对郑州市地下水资源进行评价、管理。以非均质各向同性渗流模型模拟地下水流，用不规则三角网格有限差分法求解。先解逆问题反求参数，再解正问题计算地下水各项资源量，并数值预报地下水渗流场至1998年。将模拟模型与规划模型相耦合，建立了地下水资源优化管理模型。

Numerical Simulation and Optimal Management of the Groundwater Seepage Field in Zhengzhou City

Development of industry and agriculture of Zhengzhou city has increased groundwater extraction for industry,irrigation and domestic.The intense extraction of groundwater in the study area has caused groundwater levels to decline.The problems associated with declining groundwater levels are (1) formation and expansion of depression area, (2) increased pumping lift and pumping cost, (3) deterioration of the quality of pumped groundwater and (4) land subsidence. Groundwater resources occurs in two layers in study area (depth>250m), the top layer is unconfined (shallow aquifer),layer two is confined (intermedium aquifer). The shallow and intermedium aquifers are hydraulically connected to each other by aquitarde. According to hydrogeological conceptual model, the models of the quasi three dimensional dynamical emulation are built for control and optimal of the groundwater seepage field in Zhenzhou city. The groundwater flow is emulated with the seepage model of heterogeneity isotrope, and the partial differential equations are solved with finite difference scheme of irregular triangle net. Firstly, the inverse problem is solved for parameters calculating, then the positive problem is solved to calculate groundwater resources, and the groundwater field in the future is predicted under the condition of planned pumping from 1996 to 1998. By optimal control seepage field of the groundwater to make the harmful hydrogeolical problem reduced to its minimum in overall research area.