基于改进DRASTIC模型、GIS和层次分析法(AHP)的地下水U(VI)污染风险评价

RISK ASSESSMENT ON U( VI) TO GROUNDWATER BASED ON A MODIFIED DRASTIC MODEL,GIS AND AHP METHOD

以某铀尾矿库为例,应用层次分析法(AHP)对DRASTIC进行改进,得出AHP-DRASTICLL模型,并构建了综合指数体系,在此基础上,基于GIS平台对某铀尾矿库区地下水受U(VI)污染风险进行了评价和污染区的污染风险划分。由地下水风险区划图得出尾矿库周围与砂卵砾石层区风险较高,丘陵地带风险较低,其结果较好地反映了实际的污染风险现状。

Regarding a uranium tailings as the study case,analytic hierarchy process was used to modify the DRASTIC model and establish a AHP-DRASTICLL model,build a comprehensive index system. Using this model,based on the geographic information system,risk assessment of U( VI) pollution to groundwater was evaluated and the pollution risk zone was divided.The risk around the tailings and zone with the gravel-sand layer were comparatively higher,and the hilly land was lower according to the groundwater pollution risk mapping. The evaluation results showed that the new model was more scientific,reasonable and consistent with the facts.