运用模糊综合指数法评价汉江洋县断面水质状况

Evaluation of Water Quality Status of Yang County Section of Hanjiang River by Using Fuzzy Comprehensive Index Method

汉江洋县断面为国家重点水质监测站,监测频次为12次/a,水功能区控制目标为Ⅱ类。选取汉中市汉江干流洋县水质监测断面2017年~2021年近5年的水质监测数据,应用模糊综合指数法(FCIM)评价洋县断面的水质变化状况,重点选取六种主要污染指标的年平均值进行水质评价,同时对DO值评价进行方法修正,并和综合指数法、内梅罗污染指数法结果进行对比,结果表明汉江洋县断面年均水质稳定,符合水功能区水质目标,且模糊综合指数法评价更为全面客观。

The Yang County section of the Hanjiang River is a national key water quality monitoring station,with a monitoring frequency of 12 times/a,and the water function zone control target is Category II.The water quality monitoring data of the Yang County water quality monitoring section of the main stream of the Han River in Hanzhong City in the past five years from 2017 to 2021 were selected,and the fuzzy comprehensive index method(FCIM)was used to evaluate the water quality changes of the Yang County section,focusing on selecting the annual average of six major pollution indicators The water quality was evaluated according to the value,and the DO value evaluation method was revised at the same time,and compared with the results of the comprehensive index method and the Nemerow pollution index method.The results showed that the annual average water quality of the Yangxian section of the Hanjiang River was stable,in line with the water quality objectives of the water function zone,and was vague Comprehensive index method evaluation is more comprehensive and objective.