为了客观、科学地反映南水北北调中线总干渠水体水质状况, 选取南水北调中线2015 年1 月至2018 年5 月全线8 个常规监测断面的逐月水质监测数据进行水质综合评价。单因子评价结果显示, 南水北调中线总干渠水质类别为ó 类( 基于平均值和中位值) 和? 至? 类( 基于最大值) ; 若不考虑总氮, 评价结果则为? 至ò 类( 基于平均值和中位值) 和ò 至ó 类( 基于最大值) 。综合污染指数评价结果表明, 总干渠各断面综合污染指数在01 16~ 01 30 之间, 各断面评价结果均为合格, 总氮对大部分断面污染指数的分担率都在50%以上。模糊评价结果显示, 大部分断面对? 类水质标准的隶属度均超过01 7, 对ò 类水质标准的隶属度在01 14~ 01 17 之间, 对ó 至? 类水质标准的隶属度很低, 水质最终的评价结果均为? 类。综合三种评价结果, 南水北调中线总干渠水质总体良好, 能够满足供水水质要求。

In order to objectively and scientifically reflect the water quality of the main channel of the middle route of the South-to-North Water Diversion Project ( MRSNWDP ) , the monthly water quality monitoring data of 8 routine monitoring sections along the main channel from January 2015 to May 2018 was selected for comprehensive water quality assessment. The results of the single-factor evaluation indicated that the water quality of the MRSNWDP main channel was class ó . The evaluation result was class ?2 ò ( based on mean and median) and class ?2 ? ( based on maximum) , If the total nitrogen was not taken into account. The comprehensive pollution index evaluation results showed that all sections of the main channel were between 01 16 and 01 30, and the evaluation results of all sections were qualified. The proportion of total nitrogen to pollution index of most sections was mo re than 50% . T he fuzzy evaluation results showed that the membership degree of class ? water quality standard was more than 01 7 class ò water quality standard was between 01 14 and 01 17, respectively. The membership degree of ó2 ? water quality standard was very low. T he final evaluation results of water quality were all class ? . Based on the three evaluation results, the water quality of the MRSNWDP main channel was generally good and can meet the water supply quality reqirements.

水体污染控制与治理科技重大专项( 2017ZX071082001)