Numerical Simulation and Application of Water-taking by Seepage Well

In regions where rivers are not perennial or have low conditions,the wells are placed in the riverbed to obtain the uninterrupted supply of naturally filtered groundwater through highly permeable saturated riverbed aquifers.However,various patterns of seepage well-aquifer exist when water is taken by wells.Due to the complexity of conditions,there is no analytical solution to characterize the boundary conditions accurately.To overcome this difficulty,a coupled flow numerical model was developed for simulating water-taking by wells using the equivalent hydraulic conductivity to couple different mediums and patterns inside and outside the pipe.The numerical model was applied for groundwater exploitation by 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 47 600 m3/d.The results showed that the proposed coupled seepage-pipe model can reflect the conditions for water-taking by wells,which has theoretical significances for guiding the exploration,design,and construction of wells.