利用模糊综合评判法分析由太湖引水后黄浦江水质的变化

Application of fuzzy comprehensive evaluation approach in Huangpu River water quality assessment after water diversion from Taihu Lake

为了综合评价黄浦江引入太湖水后黄浦江水质的改善状况,进而判断引水工程的可行性.采用模糊综合评判法,建立隶属函数,得到各污染因子对应于各级水质质量的隶属度,并运用取积求和法和取积取大法分别进行模糊矩阵运算,得到了两种矩阵运算方法获得的黄浦江各断面引水前后水质级别变化情况的评价结果.通过比较认为,采用取积求和法进行模糊矩阵运算可以避免由单因子评价结果代替综合评价结果的不足,评价结果更加科学.经取积求和法实证分析,引入太湖水后黄浦江主干河道松浦大桥断面水质得到明显改善,工程可行性良好.

Inorder to evaluate the water quality in Huangpu River after water diversion from Taihu Lake and feasibility of this water diversion project, the comprehensive evaluation was applied in this study. Water quality level before and after water diversion were got by using fuzzy comprehensive evaluation ap- proach. The concrete steps were：establishing relevant membership functions, obtaining the membership of each pollution factor corresponding to water quality at all levels, applying two methods of summation by taking the product and take maximum by taking product method to calculate fuzzy matrix. The Huangpu River water quality conditions after water diversion by making use of these two matrix calculation method were obtained. The results obtained by using the method of summation by taking product to calculate fuzzy matrix as the comprehensive evaluation result was suitable, and water quality of the main channel of Song- pu bridge section of Huangpu River was improved obviously after water diversion.