Study On Physical Simulation Of Water Intake Of Horizontal Seepage Well

Horizontal seepage well is a complex construction which is used to acquire relativelyclean water that has been filtered through natural alluvial deposits in a riverbed and itshigh-yield, low energy consumption, low water-supply cost and other advantages have beenrecognized by people, the project in the arid and semi-arid regions is a particularly prominentrole.This thesis relies on the National Natural Science Foundation of China (40972154)“Study on calculation model and physical modeling of non-casting-wellgroundwater-collecting structure working mechanism”.Through the sand tank physicalsimulation of horizontal seepage well pumping, further study on the influencing factors ofhorizontal seepage well pumping had been done, and correctness and applicability of themodified calculation model for groundwater flowing to horizontal seepage wells had beeninspected. It had a positive and theoretical significance.to guide the exploration and designfor the actual project of horizontal seepage well in the western arid and semiarid areas.The physical simulation of the horizontal seepage well pumping designed eighteen kindsof horizontal seepage well pumping plans, which consisted of two kinds of river, and eachriver contained three tipes of depths of chamber, each chamber included three kinds ofdrawdown of vertical well. Based on the results of eighteen kinds of horizontal seepage wellpumping plans, the main affecting factors of water yield and seepage characteristics weresummarized in physical simulation, according to the theory of coupled seepage-pipe flowmodel, the numerical simulation was carried on in accordance with the physical simulation,using the modified calculation model of groundwater flowing to a horizontal seepage wells;the permeability coefficient of aquifer and the seepage recharge capability of river wasinversed by fitting the water yield of horizontal seepage well, then correctness andapplicability of the modified calculation model for groundwater flowing to horizontal seepagewells had been inspected.. In cases the depths of chamber were minimal, medium andmaximum, if the seepage recharge capabilities of river was strong, permeability coefficient Kof aquifer inversed were65m/d,63m/d and56m/d, C values inversed were6m2/d,5.8m2/dand6.5m2/d; if the seepage recharge capability of river was weak, permeability coefficient Kof aquifer inversed were65m/d,60m/d and62m/d, and C values were1m2/d,1.2m2/d and 0.9m2/d. Comparing with the water yield of numerical simulation, the water yield of physicalsimulation measured results was fitting in a good condition. All above proved that themodified calculation model for groundwater flowing to horizontal seepage wells was reliable,and it could be used to simulate and calculate the water yield of the horizontal seepage welland describe characteristics of seepage field.After verifying the modified calculation model for groundwater flowing to horizontalseepage wells was effective and reliable, doing further study on main affecting factors ofwater yield of the horizontal seepage well, main conclusions were as follows: with the depthof the chamber decreasing, the water yield of the horizontal seepage well increased;permeability coefficient of aquifer was stronger, and the water yield of the horizontal seepagewell was more; the drawdown of vertical well were proportional to the water yield ofhorizontal seepage well, however, too much drawdown of vertical well would reduce thewater efficiency of the horizontal seepage well; with the seepage recharge capability of riverincreasing, the water yield of the horizontal seepage well increased, in a certain condition ofthe horizontal seepage well pumping, when the seepage recharge capability of river reached acertain degree, the river could be treated as the first class head boundary. the water yield ofthe horizontal seepage well was mainly affected by drawdown of vertical, permeabilitycoefficient of aquifer and depth of the chamber.