Multi-fractal characteristics of spatial structure of urban agglomeration in the middle reaches of the Yangtze River

被引：0
作者：
Zheng W. [1 ,3 ]
Du N. [1 ]
Yang Y. [1 ]
Wang X. [1 ,2 ]
Xiong Z. [1 ]
机构：
[1] Hubei Provincial Key Laboratory for Geographical Process Analysis and Simulation, College of Urban and Environmental Science, Central China Normal University, Wuhan
[2] Wuhan Branch of China Tourism Academy, Wuhan
[3] Hubei High-quality Development Research Institute, Academy of Wuhan Metropolitan Area, Central China Normal University, Wuhan
来源：
Dili Xuebao/Acta Geographica Sinica | 2022年 / 77卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Multifractal dimension spectrum; Multifractals; Nighttime imagery; Spatial structure; Urban agglomeration in the middle reaches of the Yangtze River;
D O I：
10.11821/dlxb202204012
中图分类号：
学科分类号：
摘要：
Nowadays, urban agglomerations are increasingly evolving into multi-scale, interregional complex systems. Therefore, it is necessary to apply a multi-fractal method to analyze the global and local properties of an urban agglomeration. Based on the NPP-VIIRS nighttime light data in 2018, this paper calculates the multi-fractal spectrum of urban agglomeration in the middle reaches of the Yangtze River (MRYR) and its four sub-agglomerations, and then analyzes their multi-fractal properties from the perspective of scale. The main results are as follows: (1) The nighttime light capacity dimensions show that there exists a double-scale phenomenon in the whole study region and its four sub-agglomerations. (2) When q < -5.5, the spectral curves of global fractal dimension surpass the upper limit of fractal dimension; when q > 0, the nighttime light fractal dimensions of the Wuhan and Changsha-Zhuzhou-Xiangtan (Chang-Zhu-Tan) sub-agglomerations are obviously higher. (3) The spectral curves of local fractal dimension of three sub-agglomerations of Wuhan, Poyang Lake, Chang-Zhu-Tan and Yichang-Jingzhou-Jingmen show that the peaks of the f (α) curves incline to the right, and the right ends of the curves are higher than the left ends. According to the above results, we can draw some conclusions: (1) The regional integration level of the whole study area was relatively low. (2) There was a differentiated spatial structure in different scales and regions, characterized as multiscale and complex features. (3) The whole urban agglomeration and its four sub-agglomerations tend to develop in a centralized manner. From the perspective of multi-scale interaction, this study proves the multi-fractal model is competent for detecting the complex spatial structure and the underlying problems of mega-urban agglomeration. The multi-fractal model has the potential for further theoretical exploration and practical analysis. © 2022, Science Press. All right reserved.
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页码：947 / 959
页数：12
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