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Quantifying circular urban expansion patterns of compact Chinese cities: the case of Yangtze River Delta, China

机译：量化中国紧凑型城市的循环城市扩张模式：以中国长江三角洲为例

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Accelerating urbanization all over the world has renewed interdisciplinary interest and public concerns over sustainable urban forms. Despite abundant literature on the concentric model and its application to urban land-use patterns, a rigorous and straightforward methodology to characterize the model quantitatively in space is especially needed. In this paper we present a diagramatic method and refine five indicators to measure and clarify the circular pattern of urban expansion. With remote sensing data, the approach has been examined for the sample set of fifty-one cities in the Yangtze River Delta (YRD) region of China. The five indicators adopted illustrated that most of YRD cities display a compact centralized form with a relatively small matured core area and are undergoing fast expansion. Furthermore, we have found distinctive local models of density gradient in built-up areas, shaped by urban population size and local institutional structures. The preliminary results related to the methodology are inspiring, which should be useful for elucidating urban growth trends and for decision making.
机译：全世界范围内城市化进程的加快，已经引起了跨学科的兴趣和公众对可持续城市形态的关注。尽管关于同心模型及其在城市土地利用模式中的应用已有大量文献报道，但仍特别需要一种严格而直接的方法来对模型进行空间定量表征。在本文中，我们提出了一种图解方法，并完善了五个指标来衡量和阐明城市扩张的循环模式。利用遥感数据，已对中国长江三角洲（YRD）地区的五十一个城市的样本集进行了研究。所采用的五个指标表明，长三角地区的大多数城市呈现出紧凑的集中形式，核心区域相对较小，并且正在快速扩张。此外，我们发现了由城市人口规模和当地体制结构所塑造的，在建成区的密度梯度局部模型。与该方法有关的初步结果令人鼓舞，这对于阐明城市增长趋势和决策很有用。

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