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A comparative study of spatiotemporal patterns of urban expansion in six major cities of the Yangtze River Delta from 1980 to 2015

机译：1980-2015年长江三角洲六大城市的城市扩展时空格局比较研究

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Introduction: China has been experiencing dramatic urbanization in parallel with its economic boom over the past three to four decades. The Yangtze River Delta (YRD), as the most important engine in the Chinese economy, has pioneered in the rapid urbanization road of China since the late 1970s. We quantified and compared the spatiotemporal patterns of urban expansion in six major cities in the YRD urban agglomeration between 1980 and 2015. Outcomes: We found that Shanghai, Nanjing, Hangzhou, Wuxi, Suzhou and Ningbo expanded by an annual rate of 5.4%, 5.9%, 9.6%, 7.4%, 6.3% and 8.1% from 1980 to 2015, suggesting larger cities generally possess lower growth rates. Spatiotemporal patterns of urban expansion are defined by multiple forces including physical conditions and urban planning and policy. The urbanization processes in Shanghai, Nanjing and Hangzhou generally conformed with the diffusion-coalescence theory as the number of patches (NP) and patch density (PD) of urbanized land peaked and the proportion of leapfrogging urban growth type began to decrease around 2005, which separating their urbanization processes into diffusion phase before and coalescence phase after. In contrast, Suzhou, Wuxi and Ningbo is either in the diffusion or in the transition phase from diffusion to coalescence, not showing temporal dynamics of diffusion-coalescence phase across the study period, which might be related to the fact that the urban areas in these three cities were more dispersive in space than that of other cities. Conclusions: These spatially explicit findings are the fundamental cornerstone to understand the characteristics, drivers and consequences of urban expansion in the urban agglomerations, and then detect the feasibility of general urbanization theories and further advance in-depth theoretical understanding to support a sustainable urban future.
机译：简介：在过去的三到四十年中，中国一直在经历着急剧的城市化进程，同时伴随着经济繁荣。长三角（YRD）作为中国经济中最重要的引擎，自1970年代末开始就在中国快速的城市化道路上开创了先河。我们量化并比较了1980年至2015年期间长三角地区城市群中六个主要城市的城市扩张时空格局。结果：我们发现，上海，南京，杭州，无锡，苏州和宁波的年扩张率分别为5.4％，5.9和5.9％。从1980年到2015年的百分比，9.6％，7.4％，6.3％和8.1％，表明大城市的增长率通常较低。城市扩张的时空格局是由多种因素决定的，包括自然条件，城市规划和政策。上海，南京和杭州的城市化进程总体上符合扩散-聚结理论，因为城市化土地的斑块数量（NP）和斑块密度（PD）达到峰值，而跨越式城市增长类型的比例在2005年左右开始减少。将其城市化过程分为扩散前阶段和融合后阶段。相比之下，苏州，无锡和宁波处于扩散阶段或从扩散到合并的过渡阶段，没有显示整个研究期间扩散-凝聚阶段的时间动态，这可能与这些地区的城市地区有关。三个城市在空间上比其他城市更分散。结论：这些空间明确的发现是了解城市群在城市中的扩张的特征，动因和后果，然后探寻一般城市化理论的可行性并进一步推进深入理论理解以支持可持续城市未来的基础。

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