基于铁路客运流的环渤海城市空间联系及其网络结构

Spatial Contact and Network Structure of Cities in Bohai Rim Based on Railway Passenger Flow

基于环渤海地区44个城市的铁路客运数据,运用社会网络分析、可达性分析、GIS空间分析等多种研究方法,初步揭示了该地区城市网络的空间形态、整体联系和局部联系特征。研究表明:(1)从空间形态上看,该网络大致形成"三纵二横"格局,五条客流带的走向同主要铁路干线基本一致;(2)从整体联系上看,该网络较为密集,但城市间联系的紧密程度呈现两极分化特征,其中北京—济南一带连接性和可达性始终处于较高水平;(3)从局部联系来看,大致形成辽宁、京津冀、山东西部和山东半岛四个子群,子群间联系呈现明显的距离衰减特征。

Based on the data of interactive connection of railway passenger transportation among 44 cities in Bohai Rim and the research methods of GIS spatial analysis, accessibility analysis and social network analysis, the features of spatial pattern, overall connection and local connection of the urban network in Bohai Rim are revealed. The results are presented as follows. 1） In terms of spatial pattern, the structure of ＂three vertical lines and two horizontal lines＂ is discovered, in which the positions and directions of the five belts of passenger transportation are similar to the major railway lines. 2） The network has a high density in terms of overall connection, nevertheless, the density distribute disproportionately, in which a large number of trains exist among several major cities. This can also be discovered through the phenomenon that a much higher level of connectivity and accessibility exist around the belt from Beijing to Jinan comparing to periphery areas such as Liaoning and Shandong peninsula. 3） In terms of local connection, four subgroups titled Liaoning subgroup, Jingjinji subgroup, western Shandong subgroup and Shandong peninsula subgroup are formed, with a clear distance-decay of connections among these subgroups.