Application of analytic hierarchy process-grey target theory systematic model in comprehensive evaluation of water environmental quality.
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.
Wu
Jun
J
Department of Environmental Science and Engineering, Sichuan Agricultural University, Ya'an, China.
Tian
Xiaogang
X
Tang
Ya
Y
Zhao
Yujie
Y
Hu
Yandi
Y
Fang
Zili
Z
D002681:China; D008962:Models, Theoretical; D014867:Water / Q000737:chemistry*
D014867:Water