COMPREHENSIVE EVALUATION OF WATER RESOURCES CARRYING CAPACITY IN ANKANG CITY BASED ON GAME THEORY COMBINATION WEIGHTING-TOPSIS MODEL

Adopting the statistical data of Ankang City in Shaanxi Province during 2011-2020, the evaluation index system of water resources carrying capacity is constructed on the basis of the composite system of water resources-society-economy-ecological environment. The index weights are determined by the game theory combination weighting method, and the TOPSIS method and obstacle degree model are used to evaluate the water resources carrying capacity in the area. The results reveal that the variation trend of water resources carrying capacity during 2011-2020 shows a "W" shape, with little overall change, and there is still much room for development and utilization of water resources. The carrying capacity of water resources and eco-environment subsystems shows a downward trend, while that of society and economy subsystems is on the rise. The main factors restricting the carrying capacity of water resources are eco-environment and economy subsystems. The main obstacle factors include ammonia nitrogen emission, chemical oxygen demand(COD) discharge, water consumption rate of eco-environment, daily treatment capacity of urban sewage and water consumption by unit industrial added value.