Numerical Simulation and Application of Water-taking by Seepage Well
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Abstract:
In regions where rivers are not perennial or have low flow conditions, the seepage wells are placed in the riverbed to obtain the uninterrupted supply of naturally filtered groundwater through highly permeable saturated riverbed aquifers. However, various flow patterns of “seepage well-aquifer” exist when water is taken by seepage wells. Due to the complexity of flow conditions, there is no analytical solution to characterize the boundary conditions accurately. To overcome this difficulty, a coupled “seepage-pipe flow” numerical model was developed for simulating water-taking by seepage wells using the equivalent hydraulic conductivity to couple different mediums and flow patterns inside and outside the pipe. The numerical model was applied for groundwater exploitation by seepage wells in the Zaolinping water source area in Suide County of Shanxi Province. The model was used to calculate the water yields in the normal and dry seasons and the allowable water yield was determined to be 47600 m3/d. The results showed that the proposed coupled seepage-pipe flow model can reflect the flow conditions for water-taking by seepage wells, which has theoretical significances for guiding the exploration, design, and construction of seepage wells.
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