关键词: 地下水渗流场, 准三维数值模拟, 水资源优化管理, 郑州

Abstract: 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. Ground water 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.

Key words: groundwater seepage field, quasi-three numerical simulation, groundwater optimal management, Zhengzhou city