DRASTIC地下水防污性能评价因子赋权

针对目前使用最为广泛的DRASTIC评价方法中出现的,在评分标准改变的情况下,依然沿用DRASTIC评价权重或仅是参考DRASTIC权值重新定性定权的问题,采用三标度的层次分析法,力求减少人的主观判断可能造成的决策失误,给出基于我国制定的地下水防污性能评分标准的评价因子权重,其计算结果与DRASTIC权重值存在差异,进一步强调了介质的重要性,定量确定了以土壤介质、包气带介质及含水层介质为主要影响因素,弱化了净补给量的影响,有利于提高评价结果的可靠性。

Method of determining factor weights for groundwater vulnerability assessment

After a discussion of the problems in the widely used DRASTIC model, that the factor weights were still determined by DRASTIC or determined qualitatively according to the weights used by the model when rating standards changed, the analytic hierarchy process （AHP）, based on the three-demarcation method, was used to diminish decision-making mistakes from subjective judgment and to calculate weights based on the rating standard used in assessment by the Chinese government of groundwater vulnerability to pollution. The resulting weights are different from those of the DRASTIC model, and the importance of media is emphasized. The main factors, such as soil media, vadose zone media and aquifer media, are determined quantitatively. The influence of net recharge is abated, which can help improve the reliability of assessment.