Risk Assessment Of Groundwater Contamination Based On Process Simulation

Nowadays,with the increase of human production activities and the rapid development of industry and agriculture,countries around the world polluting groundwater in the process of development and utilization is becoming more common.the groundwater environmental degradation caused by the impact on the ecological environment and social economy problems get more and more attention.Once contaminated,groundwater will be extremely difficult to manage,so it is necessary to assess possible groundwater pollution risk in the process of pollution.On the basis of research achievements and experience at home and abroad in the groundwater pollution risk,the article combining with an instance of contaminated sites,adopt the method of process simulation to build the risk evaluation system of groundwater pollution.According to the laws of the highest,choose pollution risk factor in the high pollution levels to divide the groundwater pollution risk in the region.On the basis of establishing hydrogeological conceptual model and groundwater flow numerical model and solute transport model,calculate and forecast distribution of the pollutants in groundwater.The main pollution factor in this paper is the ammonia nitrogen and cyanide.Respectively by means of two kinds of pollution factors in 1 month,3 months,1 year,3 years,5 years,10 years,comparing the pollution levels of ammonia nitrogen pollution of level 2 and 5 areas are more than cyanide.By comparing different pollution levels of pollution factors,according to the highest principles,selecting the pollution factors of ammonia nitrogen pollution levels as the basis of the groundwater pollution risk evaluation.The final study area after 10 years of computing the secondary risk area covers an area of 6.86 square kilometers;Five risk area covers an area of about 4.97 square kilometers.Selected factory downstream the main flow direction of groundwater on downstream sensitive body A bit of A and B two specific points of risk assessment,respectively simulations to predict the two position in the process of groundwater pollution risk grade of different time change.A point in the 351 th and 403 th days respectively into ? and ? risk area;Point B in the 1279 th and 1369 th days respectively into ? and ? risk area.In this paper,in addition to select two specific location to make risk assessment.Respectively to simulate and calculate the position of the two in the process of groundwater pollution risk grade of different time change,having more intuitive understanding of the degree of pollution on some important research areas of the sensitive body.Finally,on the basis of risk assessment in the study area pollution,designed two sets of contingency plans to prevent it.Through to the solute transport simulation prediction,prove the two plans in the process of groundwater contamination of groundwater environment can play a protective role.And respectively from the economy,the influence of original groundwater flow field in the studied area and its influence to the pollutant migration of two schemes are compared and analyzed.In simulating the 10 th year,the five risk area is about 3.98 square kilometers on plan 1;the five risk area is about 3.61 square kilometers on plan 2.