地表水水质的模糊综合评价

Fuzzy Comprehensive Evaluation on Surface Water Quality

地表水水质综合评价是开展地表水水质污染物对水生生物和人群健康的威胁管控工作的基础。该文试用模糊综合评价法对地表水水质进行等级评判。该方法的核心问题是确定权重,采用地表水水质Ⅲ级标准值作为权重分配基准计算权重,用三角形法与梯形法两种线性隶属函数分别计算各因子隶属度,可得两个单因子矩阵,再将权重分别与两个单因子矩阵同时考虑,按四种模糊模型进行评判。运用该方法对某市地表水进行评价,最终得出结论:该市地表水水质均为ⅴ级,属于严重污染。

The comprehensive evaluation of surface water quality is the basis for controlling the threat by surface water pollutants to aquatic organisms and human health.This paper uses the fuzzy comprehensive evaluation method to evaluate the surface water quality.The core problem of this method is to determine the weight.In this paper,the standard value of surface water quality gradeⅢis used as the weight allocation benchmark to calculate the weight,and the membership degree of each factor is calculated by using triangle method and trapeioid method respectively.The two single factor matrix are obtained.Then the weights are considered with the two single factor matrices respectively,using four kinds of fuzzy models to evaluate.Using this method,the surface water in a city is evaluated,the results show that the surface water quality is grade V in this city,which belongs to serious pollution.