Coupling research on spatio-temporal differentiation of water resources carrying capacity in mature mining cities

Abstract

Abstract Long-term unreasonable mining has seriously affected the water resources quality of mature mining cities, but mining development is an important economic pillar of those cities. The problems between sustainable development of mining cities and environmental protection of water resources need to be solved urgently. Based on the state-danger-immunity (SDI) conceptual framework, this paper constructs the evaluation system of water resources carrying capacity (WRCC), and calculates the temporal and spatial differentiation of WRCC of mature mining cities from 2013 to 2019 by combining the criteria importance through intercriteria correlation (CRITIC) method, catastrophe progression model and coupling degree model. The results show that: (1) except that the WRCC grade of Bozhou rose to overload, the WRCC grade of other cities remained unchanged. Huainan, Chuzhou and Xuancheng all showed a downward trend, Suzhou and Chizhou were relatively stable, and Bozhou showed an upward trend. (2) The WRCC of mature mining cities showed an oblique N-type fluctuation. The change range of water resources quality state was small, and the changes in water resources security danger and water resources risk immunity were completely opposite. (3) The coordinated development of mature mining cities as a whole with Chuzhou and Xuancheng has changed from primary imbalance to severe imbalance. Other cities have been in severe imbalance.