基于城市流强度测度的内陆与沿海城市群比较研究--以武汉市城市群和长三角城市群为例

经济全球化以来,城市群逐渐成为区域发展的重要载体和空间集聚形态。但目前研究主要集中在改革开放较早的沿海三大城市群,如长三角、珠三角和京津塘等,对于内地的城市群则涉及较少。而两者间对比研究则更为缺乏。本文选取沿海与内地城市群的典型代表——长三角和武汉城市圈为研究对象,构建GIS城市流强度模型,从客运流、信息流两个方面对两大城市圈的发展程度进行计算对比。结果表明,与沿海长三角城市群相比,内地武汉城市圈城市流强度较小;在结构方面,沿海的长三角城市群城市体系已经发育成熟,形成了多级中心结构,而武汉城市群仍是单中心结构。据此,从空间规划角度提出旨在提高内地城市群质量的策略。

基于互锁模型的长江中游城市群多尺度网络结构研究

现有资料中对城市群的研究多集中于沿海发达地区成熟的城市群,针对内地仍处于成长期的城市群则研究不多。并且,有限的对内地城市群的研究也多局限于分析省域城市群的规模等级、空间特征以及发展战略等方面,对于跨省域的城市群研究缺乏多尺度的城市关联度分析。本文运用互锁网络模型对长江中游城市群,包括武汉城市圈、长株潭城市群、环鄱阳湖城市群以及皖江城市带,从次区域层面、区域层面和国家层面三个尺度研究城市网络的结构。

Chinese City Size Ranking: A Comparative Study of the Urban Built-Up Area Based on Remote Sensing Data

Without a clear and unified definition of the urban built-up area, many city rankings by area are inconsistent, giving rise to confusion among the general public and even scholars. This paper summarizes various definitions of the urban built-up area and proposes three definition methods: all urban built-up areas in a municipal administrative area, concentrated contiguous built-up areas, and urban built-up areas in central cities. From the latest Landsat 8 satellite images, the paper obtains the data of urban built-up area in some of China’s big cities and makes a comparative study between the results of the urban built-up areas by the three definition methods and three other common statistical data. It finds that neither the area data nor the ranking is consistent. Finally, it further explores what causes differences in rankings and gives some advice for improving the definition of the urban built-up area.