Study On Groundwater Quality Distribution And Evaluation And Prediction Of Xiaoqinling Piedmont

With the improvement of socio-economic development and rapid development of technology groundwater,our groundwater is to “deep”、“wide” development,mining layer deepening,mining expanded.Study are-a is located in the eastern end of the Guanzhong Plain in Shaanxi Province,ranking Qin,Shaanxi,Henan pr-ovinces at the junction.The study area is one of China’s four major gold mining areas,with rich gold resources. As a result of mineral activities, causing surface water is present in the study area different levals of Pollution. So lot of groundwater exploitation turned to deep groundwater.On the one hand, exploitation of exploitation of groundwater is support the water supply of the socio-economic development. On the other Hand unreasonable exploitation of groundwater causing many environment geological problems. People us-ing the contaminated groundwater,it is harm for residents living and health.(1) This paper’s is study on Xiaoqingling Tongguan region Piedmont region.The range within 35 Km2 valley road and along the five groundwater flow.Groundwater samples collected in the laboratory analysis of samples for laboratory testing, analysis indicators include:HCO3-、CO32-、Cl-、OH-、K+、Na+、Ca2+、Mg2+、SO42-、total hardness、PH、F-、NH4+_N、NO22-、Cr6+、total chromium、Mn、Co、Ni、Cu、Zn、Cd、Pb and so on.Using <Groundwater quality standard> analysis those indicators, the result show that:F-、SO42-、total hardness project exceed the standard individual sampling points.The sample of S2 slightly exceeded,others have no exceedess.Using Surfer11 to distribute characteristics of groundwater quaLity in the study area,its shows the distribution clearly.(2)Using Fuzzy comprehensive evaluation and comprehensive pollution index to evaluate groundwater re Search studies and comparative analysis this two kinds of evaluation results.Due to the difference betweEn the two methods,the evaluation results of discrimination on the basis of the content of different water quality evaluation levels vary,but the evaluation results of the two evaluation methods are basically the saMe, Fuzzy comprehensive evaluation result of the evaluation is fine,so the level of water pollution by the more comprehensive pollution index is high.(3) Groundwater quality prediction occupies an important position in the hydrogeological study,its play an important role in understanding changes in groundwater quality, and the changes of groundwater environment, at the same time, its play an important role in guiding the study of water quality in the late. Using Modflow software to forecasted the SO42-、Cl-、NH4+_N、total hardness、F-、Cr6+ of the region’s Groundwater study area.The result show that:changes and high values predict migration of contaminants in groundwater consistent with the direction of groundwater flow.