Research on the Evaluation of Water Resources Carrying Capacity in Five Northwest Provinces Based on Entropy TOPSIS Model

The carrying capacity of water resources is one of the key factors affecting the sustainable development of the region. The evaluation of the carrying capacity of water resources can provide a data basis for the spatial balance of regional water resources. Based on the framework model of “Water Resources-Economy-Society-Ecological Environment”,an evaluation index system for water resources carrying capacity in the five northwestern provinces is constructed,and the entropy TOPSIS model and the coupling coordination model are used to quantitatively evaluate the water resources carrying capacity in the five northwestern provinces from 2004 to 2019. The spatial-temporal evolution process of force and the coupling and coordination between subsystems,the obstacle degree model is introduced to obtain the obstacles to the improvement of the water resources carrying capacity in the five northwestern provinces. The results show that from 2004 to 2019,the water resources carrying capacity of the five northwestern provinces have been slowly increasing,from a water shortage state to a reasonable state of water resources. There is a clear gap in the water resources carrying capacity between Qinghai and Shaanxi. The carrying capacity level is high,but the gap between provinces shows a good trend of shrinking year by year;the carrying capacity of water resources,economy,society,and ecological environment system shows a year-fter-year growth trend,and the development level of the carrying capacity of water resources and ecological environment subsystems lags behind that of the economy. And the social system,the water resources carrying capacity subsystems of the five northwestern provinces are in a stage of high coupling and good coordination. The development level of the five provinces and autonomous regions shows a relatively balanced situation in the inter-provincial space. The amount of water resources per capita,the modulus of water production,and the effective irrigation rate,soil erosion control area,and nature reserve area percentage table are the main obstacles hindering the improvement of water resources carrying capacity in the five northwestern provinces. The research shows that the level of water resources carrying capacity and the internal coordination of the system in the five northwestern provinces and regions are currently at a high level,and the overall direction is advancing towards a healthy,coordinated and balanced direction. At the same time,there is still a lot of room for improvement in water resources management and regional water use transformation.