考虑迁移特性的有机污染场地地下水风险评价

Groundwater risk assessment of organic contaminated sites considering migration characteristics

针对长三角地区典型低渗透地层组合及有机污染物迁移特征,结合DRASTIC模型脆弱性评价,开展了土壤—地下水系统受有机物污染的综合风险分析。长三角滨海平原地区总体上地下水位埋深浅,含水层较厚,降水量大,在污染源强相同的条件下容易遭受污染,其中饱和带以低/高渗透性土层交互分布、高渗透性土层为主的典型地层脆弱性较高。当存在高浓度重质非水相有机污染物时,易发生垂向迁移,需在污染修复治理时重点关注。

Based on the typical low permeability stratum,combined and the migration characteristics of organic pollutants and the vulnerability evaluation of DRASTIC model,the risk analysis of organic pollution of soil-groundwater system was carried out.In the Yangtze River Delta Plain region,the groundwater level is generally shallow,the aquifer is thick,and the precipitation is great.Under the same pollution source intensity,it is easy to suffer from pollution,among which the typical strata with low/high permeability soil layers in the saturation zone and high permeability soil layers as the main ones are relatively fragile.When there is high concentration of heavy non-water phase organic pollutants,vertical migration is easy to occur,which should be paid more attention to the pollution remediation and treatment.