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Water quality characteristics and assessment of Yongding New River by improved comprehensive water quality identification index based on game theory

查看全文 作　　者：Yu [1,2]Liu;Yucheng [2]Hu;Yumei [3]Hu;Yuqi [3]Gao;Zhenying [4]Liu 高影响力作者 机构地区：[1]School of Earth System Science,Institute of Surface-Earth System Science,Tianjin University,Tianjin 300072,China;[2]Tianjin Hydraulic Science Research Institute,Tianjin 300061,China;[3]School of Mathematics,Tianjin University,Tianjin 300072,China;[4]School of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300191,China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2021年第33卷第6期,共13页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(No.41807386);Tianjin Financial Budget Project of 2018。 摘　　要：The Yongding New River is essential for the water supplies of Tianjin.To date,there is no comprehensive report that assesses the year-round water quality of the Yongding New River Main stream.Moreover,little attention has been given to determining a combined weight for improving the traditional comprehensive water quality identification index(ICWQII)by the game theory.Seven water quality parameters were investigated monthly along the main stream of the Yongding New River from May 2018 to April 2019.Organic contaminants and nitrogen pollution were mainly caused by point sources pollution,and the total phosphorus mainly by non-point source pollution.Dramatic spatio-temporal variations of water quality parameters were jointly caused by different pollutant sources and hydrometeorological factors.In terms of this study,an improved comprehensive water quality identification index(ICWQII)based on entropy weight or variation coefficient and traditional CWQII underestimated the water qualities,and an ICWQII based on the superstandard multiple method overvalued the assessments.By contrast,water qualities assessments done with an ICWQII based on the game theory matched perfectly with the practical situation.The ICWQII based on game theory proposed in this study takes into account not only the degree of disorder and variation of water quality data,but also the influence of standard-exceeded pollution indicators,whose results are relatively reasonable.All findings and the ICWQII based on game theory can provide scientific support for decisions related to the water environment management of the Yongding New River and other waters. 关 键 词：Water quality assessment Improved comprehensive water quality identification index Game theory Combined weight Spatio-temporal variation Yongding New River
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