Health assessment of surface water environment in Dagu River basin based on entropy weight and multivariate connection number
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Abstract:
The health assessment index system and grading standards for surface water environment were put forward for rational exploitation and protection of water resources in Dagu River basin. A model coupling entropy weight and multivariate connection number was established based on the set pair analysis theory with consideration to the uncertainty of the boundary of grade standards for each index. The method was applied to Dagu River basin to obtain the connection numbers of the health assessment index of surface water environment. The results showed that the surface water environment of Regions Ⅰ(Laixi), Ⅱ(Pingdu), Ⅲ(Jiaozhou and Huangdao), Ⅳ(Jimo and Chengyang), and Ⅵ(Laiyang, Zhaoyuan, and Laizhou) in 2015 were all healthy, but Region Ⅴ(Gaomi) and the whole basin were sub-healthy. The surface water environment of Dagu River basin has been greatly improved by the implementation of the comprehensive management program in Qingdao. The water environment treatment of the whole basin should be carried out in order to further improve the health of the surface water environment in Dagu River basin.
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