Recharge effect prediction of deep groundwater in Tianjin
Artificial recharge of groundwater is an important method to restore groundwater level and control land subsid-ence.In order to achieve the goal of reducing the influence area of of the groundwater mining funnel and eliminating areas with serious land subsidence,this paper establishes a numerical model of groundwater flow in a deep water-bearing group in a se-vere land subsidence area in Tianjin,simulates different irrigation and extraction schemes,and combines factors such as groundwater level rise and land subsidence control degree to comprehensively evaluate the effect of artificial recharge of deep groundwater in Tianjin.The research results show that:(1)The artificial recharge of groundwater has a very significant effect on the restoration of the deep aquifer groundwater level and the reduction of land subsidence.The gradual reduction of ground-water extraction to zero and combined with groundwater recharge is the most suitable solutionfor deep groundwater level restora-tion and land subsidence control in Tianjin;(2)According to the calculation results of scheme R-4 in the article,the ground-water compression mining to zero has a control effect on land subsidence accounting for 84.5%of the overall subsidence con-trol effect,which is about 5 times of the control effect of groundwater recharge on land subsidence;(3)In order to achieve the goal of eliminating the peak of land subsidence as soon as possible,it is recommended to give priority to groundwater artificial recharge in areas with severe subsidence greater than 50 mm of Tianjin,and choose the center of the groundwater funnel in the area with severe subsidence as the recharge target area to carry out the groundwater artificial recharge test project to fill the gaps in the research on artificial recharge technology of deep groundwater in Tianjin.
artificial recharge of groundwaterland subsidencedeep groundwaternumerical simulationgroundwater lev-elsevere subsidence area
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