title: Application of analytic hierarchy process-grey target theory systematic model in comprehensive evaluation of water environmental quality.
abstract: Comprehensive evaluation of the water environment for effective water quality management is complicated by a considerable number of factors and uncertainties. It is difficult to combine micro-evaluation with the macro-evaluation process. To effectively eliminate the subjective errors of the traditional analytic hierarchy process (AHP), a new modeling approach--the analytic hierarchy process and grey target theory (AHP-GTT) systematic model--is presented in this study to evaluate water quality in a certain watershed. A case study of applying the AHP-GTT systematic model to the evaluation and analysis of the water environment was conducted in the Yibin section of the Yangtze River, China. The micro-evaluation is based on defining the weights of indices of the water quality (IWQ) of each water cross-section, while the macro-evaluation is based on calculating the comprehensive indices of water environmental quality and analyzing the tendency of the water environment of each cross-section. The results indicated that the Baixi and Shuidongmen sections are seriously polluted areas, with the tendencies of becoming worse. Also, the key IWQs of these two cross-sections are 5-day biochemical oxygen demand and chemical oxygen demand of permanganate, respectively.
authors.affiliation: Department of Environmental Science and Engineering, Sichuan Agricultural University, Ya'an, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Tian
authors.forename: Ya
authors.initials: Y
authors.lastname: Tang
authors.forename: Yujie
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yandi
authors.initials: Y
authors.lastname: Hu
authors.forename: Zili
authors.initials: Z
authors.lastname: Fang
mesh_terms: D002681:China; D008962:Models, Theoretical; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water