熵权模糊评判在双台子河水质评价中的应用

Application of Entropy Weight Fuzzy Evaluation of Water Quality in Shuangtaizi River

应用模糊评判理论,以2010和2011年双台子河监测数据为研究对象,选择DO、CODCr、NH3-N、TP、TN、BOD5、氯化物7个评价因子,建立模糊评价模型,确定模糊关系矩阵,选择熵权赋权法求各评价因子权重,以最大隶属原理为评价类别,提出一种基于熵权赋权的方法,利用模糊变换对双台子河水质进行评价与分类。评价结果表明,从权重分析,主要污染因子为BOD5、TN、CODCr、TP,次要因子依次为NH3-N、DO、氯化物;由模糊向量大小分析,水质类别为Ⅳ、Ⅴ类;由模糊向量平均值分析,污染状况下游>中游>上游;并将评价结果与综合标识指数法对比,结果显示两种评价结果近乎一致,但模糊评判使评价结果更直观反映河流水质状况,评价结果更加合理准确。

By using fuzzy mathematics,with monitoring data of Shuangtaizi River during 2010-2011 as study object,selecting DO,CODCr,NH3-N,TP,TN,BOD5,chloride seven evaluation factors,fuzzy evaluation model was established to set up an assessing matrix.The entropy weight was adopted to obtain weight of each evaluation factor.With maximum membership principle as evaluation category,fuzzy change was used to evaluate and classify water quality in Shuangtaizi River.The results showed: analysis from weight,main pollution factors are BOD5,TN,CODCr,TP,secondary factors are NH3-N,DO,chloride.Analysis from fuzzy vector size,water quality belongs to category Ⅳ and Ⅴ;Analysis from fuzzy vector average point,the most important is downstream >middle> upstream;Compared with evaluation results and comprehenisve identification index,the results showed that both almost unanimous,more intuitive to reflect the river water quality,the evaluation results are more reasonable and accurate.