Study On Numerical Simulation Of High Efficient Recharge System With Filter Layer For Wanghe Underground Reseviour

As an important part of Wanghe underground reservoir water-supply engineering, recharge system is composed of recharge well with filter layer and recharge canal with filter layer. Recharge well with filter layer used in Wanghe underground reservoirs exists some problems, such as low efficiency, easy to scour and clogging, which seriously affect the effect and service life of recharge engineering. In this paper, through improvement and optimization of the structure of the existing recharge well with filter layer, three kinds of new-type dual recharge well with filter layer with effective anti-erosion and silt-control were designed and the steady flow recharge test was carried out. In addition, single-well recharge quantities were theoretically analyzed and calculated and among them, the biggest quantity of dual recharge well with filter layer was chosen to form the high efficiency recharge recharge system; Based on the existing common and effective recharge system with filter layer, the groundwater numerical simulation research of Wanghe underground reservoir was carried out. The concrete research contents and main research results are as follows:(1) The design of the new-type dual new-type dual recharge well with filter layer with high efficiency anti-erosion and silt-controlRecharge well with filter that layer used in Wanghe underground reservoir was investigated and based on analyzing all kinds of the factors that can affect recharge quantity of recharge well with filter layer, round, square table form and square form dual recharge well with filter layer were designed. Through the laboratory tests of new-type and common recharge well with filter layer, the conclusions could be drawn: under the same conditions, single-well recharge quantities of three kinds of recharge well with filter layer were all greater than that of common recharge well with filter layer, and among three kinds of recharge well with filter layer, single-well recharge quantity of square table form dual recharge well with filter layer was biggest and was 5.15 times more than the common recharge well with filter layer.(2) High efficiency recharge system with filter layer of Wanghe underground reservoirRecharge system of Wanghe underground reservoir including recharge system with filter layer of Wanghe channel aquifer and recharge system with filter layer of Guoxi diversion canal. The general layout of recharge engineer in the plane uses Y-shape arrangement. Based on this kind of arrangement, the designed new-type recharge well with filter layer with the biggest recharge efficiency are used to replace common recharge well with filter layer and form high efficiency recharge system with filter layer.(3) Numerical simulation of high efficiency recharge system with filter layer for Wanghe underground reservoirUsing Visual MODFLOW software, firstly, hydrogeological conceptual and mathematical model of the study area were established; Secondly, through the identification and validation, these models can be determined to really reflect groundwater flow field of Wanghe underground reservoir; Finally, water level of June 1, 2004 was taken as initial water level. Based on the different layout scheme in the two systems, forecasting the groundwater level of Wanghe underground reservoir, and the predicted results conclude that high efficiency recharge system with filter layer composed of square table form dual recharge well with filter layer can utilize limited water resources water to a greater extent and obviously raise water level of the reservoir. In addition,Wanghe underground reservoir can play a better regulatory role, and this paper can supply references for similar recharge project of underground reservoir.