Evaluation Method and Application Practice of Water Resources Sustainability in Megacities

In order to serve the sustainable construction of mega cities, an evaluation index system of water resources sustainability of mega cities is established, including 15 indicators in three aspects: natural water resources, economy and society and ecological environment. According to the characteristics of indicators, they are divided into target value determination and uncertainty, and different methods are used to calculate the sustainability value of each indicator. The final weight of the index is determined by the combination of an analytic hierarchy process and the entropy method; Finally, each index is weighted and summed to calculate the water resources sustainability index. Taking Beijing as an example, the water resources sustainability index from 2000 to 2019 is calculated, and the logistic curve equation is used for numerical fitting to predict the water resources sustainability in Beijing in 2035. The results show that the sustainability of the water resources system in Beijing has been on the rise. According to the evolution law, the water resources sustainability system in Beijing can achieve sustainability in 2035.