City population dynamics and fractal transport networks
City population dynamics and fractal transport networks
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城市人口动态和分形交通网络
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Jody Wright
中科院分区：
文献类型：
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作者：
Cheryl Abundo;Todd J. Bodnar;J. Driscoll;I. Hatton;Jody Wright
我们认为人口和空间分布网络的200个最大的城市群之间的动态。人口动态被认为是从1950年到2010年，并在车辆运输基础设施方面的分销网络进行了分析。我们注意到，在人口密度方面，大城市群的增长在二十世纪后半叶有所减缓，因为它们的交通基础设施变得更加复杂。计算不平等指数还表明，由此产生的城市系统不像过去那样集中，更多的城市人口分布在数量更多、规模相对较小的城市群中。我们分析了交通基础设施的分形维数，发现发达大陆有较高的分形维数和较低的人口比不发达的。我们推测这是由于不同的道路宽度存在于一些地区和缺席的其他地区。更复杂的网络实际上扩大了城市的范围，并增加了benet公用事业的成本。更好地理解与这种网络相关的普遍原则，可以提供一个机会来评估我们对城市群的控制及其与它们所居住的更大生态系统的关系。有必要进一步分析，将上述方法与其他数据结合起来，并制定一个更全面的衡量标准，以评估和解决城市发展的长期生态、经济和社会影响。
We consider the dynamics between population and spatial distribution networks for the 200 largest urban agglomerations. Population dynamics are considered from 1950 to 2010 and distribution networks are analyzed in terms of vehicular transportation infrastructure. We observe that the growth of large urban agglomerations, in terms of population density, has slowed down in the second half of the twentieth century as their transportation infrastructure has become more complex. Computing inequality indices furthermore reveals that the resulting urban system is less concentrated than it used to be, with a larger share of the urban population distributed in more numerous, relatively smaller urban agglomerations. We analyze transportation infrastructure in terms of fractal dimension and found that developed continents have higher fractal dimensions and lower populations than non-developed ones. We speculate this is due to varying road widths existent in some areas and absent in others. More complex networks in effect extend the range of cities and offer increased cost to benet utility. Better understanding of universal principles associated with such networks affords an opportunity to assess our control of urban agglomerations and their relation to the larger ecosystem they inhabit. Further analysis is necessary to combine the above approaches with additional data and to develop a more comprehensive metric for assessing and addressing the long term ecologic, economic and social implications of urban development.