基于熵权权重的可变模糊理论在大连市地下水水质评价中的应用

Application of Variable Fuzzy Sets Model Based on Entropy Weight in Groundwater Quality Assessment of Dalian

针对地下水质评价中存在的多目标性和模糊性特点,采用可变模糊集理论模型进行评价;同时基于指标权重确定的客观性,采用熵权法确定指标权重。以大连市甘井子区2007年-2011年4月的水质调查资料为评价指标集,构筑多目标可变模糊识别模型,用熵权法确定评价指标的权重。评价结果显示,研究区内整体水质处于II～III等级之间,与传统的综合指数法评价结果相对比,将熵权法与可变模糊集理论模型相结合的评价结果比较合理,可为大连市的地下水资源综合利用与管理提供水质依据。

According to the multi-objectiveness and fuzziness in the assessment of groundwater quality, the variable fuzzy sets model could be used to assess groundwater quality. Meanwhile, the entropy method was employed in this paper to calculate the weights of the indexes to characterize their objectivity. Based on the survey data of groundwater quality from 2007 to 2011 in the Ganjingzi district of Dalian, a multi-objective variable fuzzy sets model was developed and the weights of the indexes were determined by the entropy method. The results showed that the groundwater quality in the study area was between grade II and III. Compared to the conventional comprehensive evaluation method, the results calculated using the combined entropy method and variable fuzzy sets model were more reasonable. The assessment results can provide references for the comprehensive utilization and management of groundwater resources in Dalian.