基于DRASTIC的地下水防污性能评价组合权重分配方法

A Method of Combinated Weight Distribution for Groundwater Vulnerability Assessment Based on DRASTIC

DRASTIC方法是用于地下水防污性能评价的应用最为广泛的一种方法,但该方法在指标权重分配方面存在缺陷。本文在分析前人已有成果的基础上,提出了一种新的权重分配方法,认为合理的指标权重分配应兼具主观性和客观性特点,应用层次分析法确定主观权重能够充分体现出人为经验对各指标重要程度的判断,应用投影寻踪法确定客观权重可使等级划分评分值差异较大的指标获得更大的权重,用两种权重确定组合权重作为最后的权重分配。实例应用表明方法客观合理。

The DRASTIC method is most widely applied in groundwater vulnerability assessment, but in the index weight distri- bution, it has some shortcomings. Based on the existing results obtained by our predecessors, a new method was proposed. It was reported that the subjective and objective characteristics should be contained in a reasonable index weight distribution, through the analytic hierarchy process, subjective index weights were determined, which displayed that the judgment depended on personal experience to importance of various indexes; by the projection pursuit model, objective index weights were deter- mined, which made indexes with large differences in grade rating value obtain more index weights, their combination was con- sidered as the final index weight. Practical experiences showed that this new method is objective and reasonable.