考虑出行阻抗的城市群综合客运网络可达性

Accessibility of Integrated Passenger Transport Network for Urban Agglomeration Considering Travel Impedance

为阐明城市群综合客运交通网络的多层空间结构并丰富网络的功能属性,以耦合这一全新视角提出考虑城市交通换乘的城市群综合客运网络模型,并从出行费用与出行时间出发分析节点与网络的可达性。首先,基于复杂网络理论Space-P建模方法,将城市群中的客运站点抽象为网络中的节点并进行编号,以票价与出行时间标定边权,分别构建公路客运子网、铁路客运子网。其次,划设城市群中的各城市中心城区为独立的交通小区,将有城市公共交通、步行等换乘方式连接的节点间添加耦合边,构建耦合子网。再次,将两类客运子网通过耦合子网组合叠加为综合网络,改进传统网络效率指标,构建加权的阻抗效率指标评估节点与网络的阻抗可达性。最后,以成渝城市群为实例研究,构建成渝城市群综合客运网络并分析公路、铁路、综合网络的阻抗可达性。结果表明:多个节点的耦合使得这些节点的阻抗可达性较好,因此在研究城市群综合客运交通网络时,城市交通换乘是不可忽略的因素;综合网络的阻抗可达性相较于公路子网、铁路子网分别提升了83.4%,28.5%,公路与铁路客运子网的耦合提高了城市群客运交通网络的阻抗可达性;推进站点间、多种运输方式间的耦合协调,继而构建更加便捷顺畅的城市群综合客运交通网络,是降低旅客的出行成本的重要途径。

In order to clarify the multi-layer spatial structure of integrated passenger transport network for urban agglomeration and enrich its functional attributes,a new model of integrated passenger transport network for urban agglomeration considering urban transport transfer is proposed from a new perspective of coupling,and the accessibility of nodes and networks is analyzed from the perspective of travel cost and travel time.Firstly,the highway subnet and the railway subnet are constructed based on Space-P modeling method of complex network theory.The passenger stations in the urban agglomeration are abstracted as nodes in the network and numbered,and the edge weights are calibrated by travel fare and time.Secondly,the central urban area of each city in the urban agglomeration is designated as a traffic district,and coupling edges are added among nodes connected by urban public transport,walking or other transfer modes to build coupling subnets.Subsequently,the highway and railway subnets are combined into the integrated network by coupling subnets,and the traditional network efficiency indicator is improved to construct a weighted impedance efficiency indicator to evaluate the impedance accessibility of nodes and networks.Finally,taking Chengdu-Chongqing urban agglomeration as a case study,the result shows that(1)the coupling of multiple nodes makes the impedance accessibility of nodes better,therefore,urban transport transfer is an important factor in the study of integrated passenger transport network for urban agglomeration;(2)compared with the highway subnet and the railway subnet,the impedance accessibility of the integrated network is improved by 83.4%and 28.5%respectively,indicating that the coupling of highway and railway passenger subnets improves the impedance accessibility of urban agglomeration passenger transport network;(3)it is an important way to reduce the travel cost and time for passengers to promote the coupling and coordination among stations or among multiple transportation modes,and then build a more convenient integrated passenger transport network in urban agglomeration.