长江经济带城市网络结构与空间格局——基于高速铁路流数据的分析

Urban Network Structure and Spatial Pattern in Yangtze River Economic Belt Based on the Analysis of HSR Flow Data

基于长江经济带的高速铁路流数据,结合客流组织系数、社区挖掘和网络可视化等方法分析城市网络结构与空间格局,为城市网络研究提供新的视角。结果表明:(1)长江经济带城市网络结构表现出强烈的空间异质性,东中西部地区差异显著,空间层级特征和廊道效应明显,强中心城市主要分布在东部和中部地区,西部地区缺乏强中心的支撑;(2)通过社区挖掘识别出7个城市集聚区,与城市群和行政区存在一定程度的空间耦合,不同地域系统内城市网络自成体系;(3)综合地理网络和拓扑网络,将各集聚区内部城市关联形态划分为单中心、双中心、多中心和低水平均衡4种格局,以多中心格局为主,7个城市集聚区网络化程度的不均衡性显著。

Based on the high-speed rail(HSR)flow data in Yangtze River Economic Belt,this paper applies passenger flow organization coefficient,community detection,visualization of topological network in analyzing urban network structure and regional effect,and identified features and rules of its spatial organization mode.The purpose is to provide new methods and cognitive perspective for further urban network research.The research result shows that:(1)The urban network structure based on HSR flow has obvious spatial heterogeneity and characteristics of hierarchical spatial structure as well as clear corridor effect.The strong center of the cities are mainly distributed in the east and central regions,and the western region lacks the support of the strong center.(2)The 7 urban agglomerations identified through community detection algorithm are spatially coupled with major urban agglomerations and administrative regions,and the urban networks in different territorial systems create a system of their own,with varied scales and diversified spatial organization mode.(3)Integrated with geographic networks and topological networks,urban agglomerations’spatial structure can be basically divided into four modes(i.e.single-center,dual-center,multi-center,and low-level balanced mode)that are dominated by the multi-center mode,and this indicates an unbalanced pattern.