Characteristics Of Groundwater Environment And Numerical Simulation Of Contaminant Transport In A Metal Mine In Tongling

The mining of metal mines will produce a series of environmental problems.Tongling,Anhui Province,is an important non-ferrous metal mining city in China.The waste produced by mining activities has caused serious pollution to the regional ecological environment.However,there is a lack of research on groundwater environment in this area,so it is of great theoretical and practical significance to find out the current situation of groundwater environment and the impact of mining on groundwater environment.According to the hydrogeological conditions and the distribution of the main mines in the study area,this paper determined the location coordinates of the sampling points of surface water,groundwater and river sediment,and carried out field sampling and inspection analysis and test;arranged and analyzed the analysis and test results of the samples,and determined the hydrochemical characteristics and types of surface water and groundwater by using SPSS software and Piper three line diagram;Using the methods of ion proportion coefficient and strontium isotope analysis,combined with the aquifer lithology,mining and human activities in the study area,the genesis and evolution of the surface water and groundwater in the study area were studied and analyzed;according to the existing engineering geological drilling data,the three-dimensional hydrogeological model of the eastern plain of Shizishan mining area in the study area was established,and the model was simulated by numerical simulation software The migration of SO₄^2-and Fe in groundwater was simulated.Through the above research,the main conclusions are as follows:1.The hydrochemical types of the surface water in the study area are SO₄-Ca,the hydrochemical types of the groundwater are HCO₃-SO₄-Ca,HCO₃-Ca and a small amount of SO₄-HCO₃-Ca and SO₄-Ca.The formation of the main components of groundwater in the study area is mainly affected by the dissolution and filtration,cation exchange and human activities.2.The dissolution sources of calcite in surface water and groundwater account for more than 70%,and the dissolution sources of silicate rock and dolomite account for less than 30%.Under the influence of solution and filtration,cation exchange,mining and industrial and agricultural activities in the study area,the changes of conventional ions,TDS and pH indexes in the South and North sections are more complicated than those in the surface water.3.GMS is used to simulate the eastern plain of Shizishan mining area in the study area.It is found that SO₄^2-and Fe will continue to spread eastward with the continuous mining of Shizishan mining area in the simulated 15 years,but the diffusion speed of pollution plume is slow.Only the concentration of SO₄^2-and Fe exceeds the standard in a small area in the east of online supply,and the exceeding range is small,and the polluted area is small,which will not seriously affect the groundwater quality in the simulation.