Evaluation of water-economy-ecology system development level and coupling coordination degree: a case study of China's central plains urban agglomeration.

As can be seen from the figure, although the change amplitude of the CDI of the WEE coupled system in various cities varies greatly during 2011–2020, overall they all show a positive trend year by year.

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For the CDA, there is a big difference between the CD trend of CDA-ZZMA and other regions, but the CD of CDA-ZZMA shows a decreasing trend, and the CD of other regions shows an increasing trend.

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From the figure, the CD of the two systems is high, with an average value of 0.9954, and basically shows an increasing trend, while the CCD shows an increasing trend year by year, with a CCD between 0.7223 and 0.8061.

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