Numerical simulation of stereoscopic remediation of contaminated groundwater along rivers

To solve the problem of groundwater pollution along the rivers,a stereoscopic remediation demonstration project is built in a water system in Tongzhou of Beijing，China.The Modflow module and GMS software module RT3D are used to establish a coupling model for groundwater flow and solute transport to predict the effect of groundwater remediation under different conditions.The simulation results show that,the mass concentration of ammonia nitrogen in the groundwater along the river decreased from class V to class III,and locally to class II under the condition of 10,000 m3 of water volume per day.Likewise, the natural infiltration per day is only 2000 m3 under the condition of seepage reduction,which can not form the stereoscopic circulation of groundwater.Ten years later,the mass concentration of ammonia nitrogen in the groundwater along the river is class IV,and locally is class V.The results show that the excavation of the river bed does not use clay to reduce seepage,and the pumping and natural infiltration of polluted groundwater near the river can form a stereoscopic circulation,and the effect of water remediation is significant.

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