Since the analytical methods are complex in calculation and difficult to describe the complicated boundary conditions of flow systems and the structure of aquifers, a 2D profile numerical model for groundwater flow systems is established based on groundwater modelling system (CMS) software. The flow nets automatically generated in the software are employed to analyze various control factors for the structure of a groundwater flow system through a case study of the typical northern profile of Ordos Cretaceous Basin. The results show that the horizontal growth scale of the groundwater flow system is controlled by the topography (boundary conditions), and its vertical scale is dependent on the anisotropy of the aquifer. The ratio of horizontal to vertical permeability coefficient relates to the structure of the aquifer and depends on change of grid size of the model, and it has certain scale effect.%针对解析法计算难度大,且难以描述水流系统复杂边界条件和含水层结构的问题,利用GMS软件建立水流系统的剖面二维数值模型,通过软件自动生成流网图,并以鄂尔多斯白垩系盆地北部典型剖面为例,分析影响水流系统结构的各种控制因素.结果表明,水流系统的水平发育规模主要受地形(边界条件)控制,而垂向循环深度主要受控于含水层各向异性,水平渗透系数和垂向渗透系数的比值与含水层的结构有关,并且依赖于模型剖分单元格尺寸的变化,具有一定的尺度效应.
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