三大国家级城市群网络结构特征及其层级联系研究

为了探究城市群网络结构特征，基于2010年、2020年城市群空间网络的客运数据，运用社会网络分析研究沿海三大城市群空间网络的拓扑结构，并对其内在经济效应进行评估，同时运用自然断裂法对城市群的层级结构进行考查。结果表明：珠三角城市群空间关联的网络密度最大，城市之间的联系更强，京津冀城市群次之，长三角城市群较弱，因长三角城市群跨越地域广，各个省份之间的联系强弱不匀；京津冀城市群空间网络呈现典型的主次结构，长三角城市群空间网络呈现典型的多中心结构，珠三角城市群空间网络呈现穗深双核结构；城市间的距离、要素扩散与集聚、产业结构、经济全球化等4类因素对凝聚子群划分有显著影响。

Research on the Network Structure Characteristics and Hierarchical Relationships of Three National Urban Agglomerations

In view of an exploration of the network structure characteristics of urban agglomerations, based on the passenger transport data of urban agglomerations in 2010 and 2020, a research has been conducted on the topological structure of the spatial network of the three coastal urban agglomerations by using the social network analysis, followed by an analysis of its internal economic effect. Meanwhile, an investigation has been made of the hierarchical structure of urban agglomerations by using the natural fracture method. The results show that there is the largest spatial correlation network density of urban agglomeration in the Pearl River Delta with a stronger links between cities, to be followed by Beijing-Tianjin-Hebei urban agglomeration, while the Yangtze River Delta urban agglomeration is rather weak, due to the fact that the Yangtze River Delta urban agglomeration spans a wide area with an uneven links between various provinces. The spatial network of Beijing-Tianjin-Hebei urban agglomeration is characterized with a typical primary and secondary structure, the Yangtze River Delta urban agglomeration a typical polycentric structure, while the Pearl River Delta urban agglomeration a panic-deep dual-core structure, with the distance between cities, factor diffusion and agglomeration, industrial structure and economic globalization exerting a significant impact on the division of agglomeration subgroups.