Risk Assessment Of Groundwater Potential Pollution Risk Sources In Shunyi District, Beijing

Groundwater has special significance for human survival,and the risk assessment of potential pollution risk of groundwater can provide reference for prevention and control of groundwater pollution.This study mainly constructs a comprehensive index system for risk assessment of potential pollution sources of groundwater through pollution source-pathwayreceptor analysis,and completes the risk assessment of groundwater pollution risk sources.According to the pollution distribution situation in Shunyi District of Beijing,five categories of pollution risk sources and their characteristic pollutants were screened out,and the hazard evaluation method based on pollutant properties and emissions was constructed to complete the hazard assessment of potential pollution sources of groundwater.At the same time,according to the actual situation of the study area,the DRASTIC model is improved,the type of aeration belt medium is removed,the land use type is increased,the DRASTHC model is constructed,and the groundwater stainability evaluation is completed.The groundwater function value evaluation index system was constructed,and the groundwater function value evaluation was completed based on the ArcGIS platform.Based on the risk assessment of potential pollution risk sources,the evaluation of groundwater vulnerability,and the evaluation of groundwater function value,the product superposition method is used to complete the risk assessment of potential pollution risk sources of groundwater,so that the risk assessment results are more accurate and adopted at home and abroad.The WHO-PAHO system and the UNESCO system used are evaluated separately,and finally compared with the product superposition results.The main conclusions of the paper are as follows:1.The groundwater potential pollution risk source hazard evaluation results show that industrial risk sources,agricultural risk sources,life risk sources,groundwater bodies,underground facilities,five types of pollution risk sources,industrial,agricultural and domestic pollution risk sources may be groundwater The damage caused by it is relatively greater.The risk sources of surface water bodies and underground facilities are relatively less harmful.The areas with high risk of potential pollution risks are mainly concentrated in Yangzhen,Mapo Town and Liqiao.In areas such as towns,the overall pollution risk source is less harmful.2.Based on the evaluation results of groundwater vulnerability,the evaluation results are divided into five levels: high,high,medium,low and low.The results show that the total area of the area with low pollution is close to the total area of the study area.Half of the area with high pollution is concentrated in Beixiaoying Town,Niulanshan Town,Nancai Town,Lijing Town and the northwestern part of Mulin Town.3.Based on the evaluation of groundwater function value,the evaluation results are divided into reserved areas,protected areas and development zones.Among them,nonminable areas account for about one-tenth of the whole area.The development areas are mainly concentrated in Dasun Town,Tianzhu,and Houyi.Satay and Longwan Bay towns.The overall mining value is good.4.Risk assessment of groundwater potential pollution risk source consists of three parts: groundwater potential pollution risk source hazard,groundwater pollution,and groundwater function value.The risk assessment results are divided into low,low,medium,high and high five.The results show that the error between the UNESCO system and the product superposition is small,and the WHO-PAHO system has a large error with the product superposition.Therefore,the UNESCO system and the product superposition can reflect the risk of the groundwater potential pollution risk source in the study area.In this study,the product is superimposed as the evaluation result,and the risk of potential pollution risk of groundwater in the study area is small.