长三角城市群“空间流”层级功能结构——基于高铁客运数据的分析

高铁作为城市群内部物质与信息交流的基础设施,是城市扩展和城市间相互联系的重要通道,而城市群则是被高铁系统压缩了空间的众多城市空间。本文通过采集长三角城市群380个高速铁路客运数据建构20×20的矩阵,建立了基于高铁客流的长三角城市群城市间联系的矩阵,并在此基础上对长三角城市群内外空间结构进行深入分析。结果表明：①长三角城市群核心城市上海、南京、杭州、宁波间城市网络联系密度高于其他廊道城市间联系;②长三角城市群核心城市向外延伸的轴线联系加强,主要表现为上海与镇江、嘉兴,南京与丹阳、湖州,苏州与常州、昆山等城市间联系紧凑;③在城市群“空间流”分层方面：第一层级主要分布在长三角地区“沪—苏—锡—常”及其沿线;第二层级城市网络主要由“沪—宁”及其沿线路线构成;第三层级城市网络主要由“沪—杭—甬”及其沿线路线构成;第四层级城市网络主要由上海—金华—义乌及其沿线路线构成。

Functional structure of spatial flow in the Yangtze River Delta: Analysis of passenger based data for the high speed railway

High-speed rail as the infrastructure for material and information exchange is important channels in urban agglomerations that connect urban centers and facilitate urban expansion, and urban agglomeration is a greater metropolitan area whose internal separation is reduced by high-speed rail system. This study used passenger flow data of 380 sites in the Yangtze River Delta high-speed railway system to construct a 20 by 20 matrix for examining connections between cities in the Yangtze River Delta Urban Agglomeration and its spatial structure. The results show that: (1) The density of network connection between the core cities in the Yangtze River Delta—Shanghai, Nanjing, Hangzhou, and Ningbo—is higher than between other cities; (2) Connections between the core cities of the Yangtze River Delta and cities along major transportation axes, such as Shanghai to Zhenjiang and Jiaxing, Nanjing to Danyang and Huzhou, and Suzhou to Changzhou and Kunshan, have been strong; (3) In terms of "spatial flow" stratification, the first level city network mainly consists of Shanghai-Suzhou-Wuxi-Changzhou and cites along the transportation routes between these cities; the second level city network is mainly composed of Shanghai and Ningbo and cities along the route; the third level city network is mainly composed of Shanghai-Hangzhou-Ningbo and cities along the transportation routes between them; the fourth level city network is mainly composed of Shanghai Jinhua and Yiwu and cities along the route.