西安市平原区地下水污染风险研究

STUDY ON GROUNDWATER POLLUTION RISK IN PLAIN AREA OF XI’AN CITY

地下水污染风险评价对地下水污染防治及土地的合理开发利用具有重要意义。通过分析西安市平原区浅层地下水特征,建立了包含地下水脆弱性、污染源荷载及水功能价值的地下水污染风险评价概念模型,对西安市平原区地下水污染风险进行了评价。结果表明:西安市平原区地下水污染高、中、低风险区分别占研究区总面积的0.2%、28.8%、71.1%。平原区地下水污染中等以上风险区主要集中分布在周至县的渭河沿岸、长安区的浐河沿岸以及蓝田县的灞河沿岸,地下水脆弱性高、污染源荷载相对较强是造成该地区污染风险相对较高的主要原因。

Groundwater pollution risk assessment is important for the rational development and utilization of land and groundwater pollution prevention.By analyzing the characteristics of shallow groundwater in the plain area of Xi’an,a conceptual model of groundwater pollution risk assessment including groundwater vulnerability,pollution source load and water function value was established,and the groundwater pollution risk of the plain area of Xi’an was evaluated.The results showed that the high,medium and low risk areas of groundwater pollution in the plain area of Xi’an accounted for 0.2%,28.8%and 71.1%of the total study area,respectively.The medium and above risk areas of groundwater pollution in the plain area were mainly distributed along the banks of the Weihe River in Zhouzhi County,along the Weihe River in Chang’an District,and along the Weihe River in Lantian County.The high groundwater vulnerability and relatively strong pollution source load were the main reasons for the relatively high pollution risk in the region.