Numerical simulation of vertical circulation well under lateral boundary conditions
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Abstract:
The influence of the lateral boundary conditions on the hydrody namic field of the vertical circulation well is focused on. T he mathem atical model and analytical solution under the existing lateral unbounded conditions are analyzed. Based on MODFLOW, the num erical model under the condition of lateral boundedness is established, which simulates the multiple sets of different pum ping flow and sam pling intervals. The error distribution map, the forward trace stream line diag ram and the groundwater flow r atio map show the influence of the lateral boundary on the head, streamline morphology and flow ratio , respectively. The re sults show that: with the increase of flow rate and the spacing of the pumping section, the circulation range of the hydrodynam ic field of the vertical circulation well increases, the influence of the boundary on the hydrodynamic field of the vertical circulation well is gradually obvious, the flow line is closer to the lateral boundary, the shape is close to a rectangle by an ellipse, and the proportion of groundwater exchange in the outermost equilibrium zone is reduced. The influence of the lateral boundary on the flow field is further analyzed quant itatively by proposing dimensionless parameters.
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