Resilience assessment of water resources system and analysis of regulatory factors in the Yangtze River Economic Belt from the perspective of spatio-temporal heterogeneity
The assessment and regulation of water resources system resilience plays an important role in the alleviation of crises and risks related to water resources. Based on the attributes of natural resources, social economy, ecological environment of water resources, a water resources system resilience evaluation index system was constructed with the consideration of the resistance, recovery, and adaptability characteristics of water resources system resilience. This system includes six dimensions: water resources resilience, water economy resilience, water welfare resilience, water management resilience, water ecology resilience and water environment resilience. Then, a projection pursuit model based on the sparrow search algorithm was established, the natural breakpoint method was used to identify regional spatial differentiation characteristics and the geographical detector was adopted to explore the regulatory factors of the spatial distribution pattern of water resources system resilience. According to the analysis of the water resources system resilience in 11 provinces and cities of the Yangtze River Economic Belt from 2010 to 2019, it was found that in terms of spatial distribution, the resilience of water resources in the Yangtze River Economic Belt was the highest in the western region, followed by the eastern region, but the lowest in the central region, and the south was generally better than the north. From temporal perspective, the resilience of the water resources system in the Yangtze River Economic Belt has fluctuated over the study period, but overall showed an upward trend. From the perspective of six dimensions, the range of the resilience value of the water ecology resilience was relatively large, fluctuating within the range of 0.08-0.52, water welfare resilience was the highest, followed by the water environment resilience. The factors of water resources and water welfare subsystem had a greater impact on the resilience of water resources system, and the proportion of industrial wastewater treatment investment in GDP and the water consumption per 10， 000 yuan of industrial added value of water economy subsystem, as well as the impact of water supply pipeline density and per capita water supply of water welfare subsystem, were gradually increasing. Through the analysis of resilience and regulatory factors of the water resources system in the Yangtze River Economic Belt, targeted countermeasures and suggestions were proposed to improve the resilience of the water resources system in this area.