Application of Set Pair Analysis in Water Quality Evaluation of Water Source Area

以集对分析理论为基础，建立水质样本实测年均值与各级地表水环境质量标准之间的联系度表达式来构造集对分析模型。利用普洱市思茅主城区集中式供水水库2012年至2016年实测均值，选取五日生化需氧量、氨氮、高锰酸盐指数、溶解氧、粪大肠菌群实测指标均值与各级标准界值的大小关系进行计算得到联系度，据此对原水水质进行分析评价水环境质量等级的判定。模型应用表明：普洱市思茅主城区集中式供水水库水质在I级和II级之间，水质质量总体较佳；集对分析模型评价在集中式供水水库水质分析评价中具有实用性和可操作性，评价结果较为直观、可靠。 Being based on set pair analysis (SPA), the relation between the annual mean value of water samples and the environmental quality standards of different levels of surface water is set up, to construct the SPA pattern. Based on the measured mean (2012-2016) of the centralized water supply reservoir of the main city of Pu’er, the index of biochemical oxygen demand, ammonia nitrogen and permanganate and the measured average index of dissolved oxygen and fecal coliform are chosen to be compared with different levels of standard critical value to come to a connection degree, being based on which to analyse and evaluate the raw water quality and judge the levels of quality of water environment. The application of the pattern suggests that the water quality of the centralized water supply reservoir of the main city of Pu’er is between level I and level II, and the water quality is generally fine. In terms of water quality analysis and evaluation, the SPA pattern is useful and practical and the evaluation result of which is intuitive and reliable.