A Case Study on the Scheme Optimization of Horizontal Wells to Exploit Groundwater
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Abstract:
In order to exploit groundwater reasonably and effectively, a scientific designof exploitation plan is very important. In the Hehe water source region of Shenmu Country in the north of Shaanxi province, three groundwater exploitation schemes with horizontal wells were selected including the gallery, radial well, and seepage well. Each scheme had several exploitation plans with 20 plans designed for gallery, 2 for radial well, and 2 for seepage well. Numerical simulations of groundwater flow under different schemes were performed using Visual MODFLOW based on the theories of "equivalent permeability coefficient" and "seepage - pipe coupling model", and the water yields in the normal season and dry season were calculated for each exploitation plan. In consideration of the factors such as the attenuation degree of water yield in the dry season, construction difficulty and cost, and management complexity, the plan of “4 seepage wells to exploit groundwater” was regarded as the best plan. The total water yield was 35400 m3/d in the normal season and 27500 m3/d in the dry season under this exploitation plan in the study area.
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