Hydrogeological Characteristics And Groundwater Contaminant Migration Research Of YiBin ZongChang

Belonging to Yibin city, in the study area is located in the southern margin of the sichuan basin, belongs to the red layer of water resources, the red layer "drilling Wells for water" project partly relieve the water shortage situation, local residents are still faced with the water sustainable and the security of water quality and so on.Paper with red layer regional hydrogeological conditions as the background, studying the characteristics of the area within the aquifer water, groundwater chemical types, size and discharge characteristics;Use of single index evaluation method and inside plum index method, the present situation and the water quality of groundwater in the area using the method of single index evaluation of groundwater pollution in the area, and analyzes the pollution source of groundwater, on this basis, further discussed groundwater pollutant migration process, combining the hydrogeological conditions, establish the corresponding mathematical model of groundwater pollutant migration with analytic method to calculate the groundwater pollution range migration and the migration time, results are as follows:Pore, fissure water in weathered zone is given priority to, shallow groundwater is buried deeply 0.12~28.6 m, gully area relatively shallow buried depth.are greatly influenced by human activities,SO42-,Cl- in the groundwater levels increase, the region hydrochemical types tend to be complex, 18 classes, HCO3-Ca+SO4, HCO3-Ca, HCO3+SO4-Na+Ca give priority to groundwater quality;Single index of water quality evaluation results show that in parts of p H, TDS, total hardness, SO42-, NO3-, group division is overproof groundwater drinking standard, the main factors affecting the quality of groundwater; according to Nemerow index method, groundwater quality is generally poor condition, water quality poor- very poor water accounted for 85.19%; according to the fuzzy comprehensive evaluation method, study area inland water quality up to class III water standard water and ultra III samples were 50%, half and half. Comprehensive analysis shows that the study area inland water quality is good on the whole, but some areas exist single index exceeded the phenomenon(such as TDS, total hardness, SO42-, NO3-), which in most parts of the NO3- of grade V standard, as the impact zone inland water quality is the main factor.Generalizability hydrogeological conditions in the study area, the selection of NO3-as the simulation factor, mathematical probability model, using the analytic solution, obtained the relationship in NO3- along the direction of groundwater pollution of distance and time. It is concluded that at a fixed point, the relationship between time and concentration of pollutants; in a moment, distance and concentration of pollutants in the relationship.