Compared to the Beijing–Tianjin–Hebei region in northern China [ 52 ], both areas display an overall trend of improvement in the water system’s structure at larger scales but face the risk of degradation at smaller scales.
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Spatiotemporal Evolution of the Water System's Structure and Its Relationship with Urban System Based on Fractal Dimension: A Case Study of the Huaihe River Basin, China.
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The sentences
From 1990 to 2019, the overall grid dimensions of the water system, D , and the grid dimension of the first-order scale zone, D 1 , show an increasing trend, while the grid dimension of the second-order scale zone, D 2 , exhibits a decreasing trend.
In recent years, because of the widespread public attention and the implementation of relevant measures, this situation has improved, exhibiting a positive trend, but the risk of water scarcity still exists.
Secondly, the spatial filling degree of the urban areas in the HRB has been continuously increasing, and the urban structure has shown a clear trend of optimization at different scales.
The peak of the singular spectrum showed a trend of gradually increasing and shifting to the right, with the most significant changes from 2000 to 2019.