基于集对分析的滦河干流承德段水质评价

滦河是京津重要的水源涵养区和生态保护区,滦河干流承德段的水环境质量直接关系着京津地区的水安全,因此,开展滦河干流承德段的水质评价具有重要的现实意义。通过划分指标类别及丰、平、枯三个时期,采用五元集对分析法对2020年滦河干流承德段水质进行了评价,并通过减法集对势和偏联系数识别了河段主要污染物指标,探讨了各类指标的发展态势。结果表明：滦河干流承德段各断面水质总体上达到Ⅱ类水标准,但以总氮和总磷为代表的营养物质含量较高,有发生富营养化的风险；总磷、总氮、高锰酸盐指数和化学需氧量为河段主要污染物,且基本水质指标有正向发展态势,营养物质状态指标处于反势和偏反势,需要进行重点调控。

Water Quality Evaluation of the Chengde Section of Luanhe River Based on Set Pair Analysis

To study and analyze the water quality and main pollutant indicators of the Chengde section of the Luan River mainstream in 2020, the water quality of the Chengde section of the main stream of the Luan River is evaluated by the five-element set analysis method by dividing the index categories and the three periods of high, normal and dry periods, and the main pollutant indicators of the river section are identified through the subtraction set pairing potential and partial connection number. Discussed the development trend of various indicators. the result shows: The water quality of all sections of the Chengde section of the main stream of the Luan River generally meets the Class II water standard, but the nutrient content represented by total nitrogen and total phosphorus is relatively high, and there is a risk of eutrophication; Total phosphorus, total nitrogen, permanganate index, and chemical oxygen demand are the main pollutants in the river section, and the basic water quality indicators have a positive development trend, and the nutrient status indicators are in a reverse trend and a biased trend, and need to be controlled.