The study focuses on whether city cluster as an urbanization development mode can solve the problem of stable water system development that cannot be solved at the city level. This study selects the Jing-Jin-Ji city cluster and the Yangtze River Delta city cluster as the research objects for comparative analysis. First, the coupling index system of urbanization and water was constructed, then the urbanization subsystem and the water subsystem were evaluated by the Comprehensive Gravity-Gram Schmidt Orthogonalization coupling model (CG-GSO) and the entropy weight method. Second, the coordinated development between urbanization and water was explored based on the coupling coordination degree model, and its driving factors were analyzed. The results showed: (1) the overall trends of urbanization development were on the rise in both city clusters; (2) whether in the water-deficient Jing-Jin-Ji city cluster or the water-abundant Yangtze River Delta city cluster, the water pollution dimension and the water supply and use dimension alternately occupied the largest proportion in the water subsystem; (3) in the urbanization subsystem and the water subsystem, the driving factors promoting the coordinated development in the coupling system were demographic urbanization dimension and water supply and use dimension in the Jing-Jin-Ji city cluster, and social urbanization dimension and water supply and use dimension in the Yangtze River Delta city cluster. Overall, as the development mode, city cluster did solve the problem of uncoordinated development of the coupling urbanization and water system in inner cities, and the coordination degrees were upward from unbalanced to balanced development, which were from 0.1278 to 0.4118 in the Jing-Jin-Ji city cluster and from 0.1770 to 0.5001 in the Yangtze River Delta city cluster. The study framework could provide ideas for other regions to solve the problem of coordinated development between water and urbanization.
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