五元系数法-改进熵权法在水质评价中的应用

为了使水质监测值和水体划类标准值之间关系更紧密,利用五元联系数方法建立了各水质评价指标与评价标准的五元联系数;同时在传统熵权计算的基础上,采用秩比法设定偏好校正系数,得到改进的熵权重;最后将五元联系数ui和改进的熵权重WRi相结合获得五元综合联系度,据此对水质进行评价,这是一种主客观结合的、符合实际情况的水质评价新方法。以贵州贵阳市河流断面监测数据为例,评定样本点所在河段水质等级,分析了该河流水质变化趋势,验证了五元系数法-改进熵权法水质评价方法的实用性。

Application of five2element connection number method2improved entropy method in water quality evaluation

To tig ht the r elatio nship betw een the w ater quality mo nitor ing value and wat er classified standar d, the fiv e2elementco nnection number met ho d w as used to establish the fiv e2element connect ion numbers o f the evaluat ion cr iter ia for v ario us indi2cato rs of w ater quality evaluatio n. On the basis of t raditio nal entro py w eig ht calculation, t he rank method w as used t o set thepr eference cor rectio n co ef ficient s and then to o btain the impr ov ed entro py weig hts. The fiv e2element co nnection number ui w ascombined w ith the improv ed entro py weight WRi to obtain the com pr ehensive fiv e2element connect ion for w ater quality ev alua2tion. T his is a new ly combined o bject ive and subjectiv e method for w ater quality evaluation. T he method w as applied to evaluat ewater qualit y g rade and analy ze the var iatio n tr end of water qualit y in a riv er of Guiy ang City o f Guizho u Prov ince based on themonitor ing data of a cr oss section, w hich v erified the applicability of the five2element connect ion number metho d2impr ov ed en2tr opy method in w ater quality ev aluatio n.