Analysis On The Evolution Of Traffic Network Accessibility In Chinese Mainland

Research on accessibility of traffic network has been a hot topic in transportation geography.The research on the accessibility of traffic network plays an important role in improving the transportation network layout and improving the traffic efficiency.In addition,the improvement of the accessibility of the traffic network is conducive to the sustainable development of economy and social progress.In order to analyze the accessibility of the traffic network development in Chinese Mainland,diagnose its characteristics and existing problem and provide the support for optimizing the traffic network plans,this paper took the railway and highway network in Chinese Mainland as the research object,the year of 2007,2016 and 2030 as the time nodes,and extended the space syntax model to realize the macro scaled application and analyzed accessibility evolution in research area.Firstly,divided the traffic network into four types,classified the traffic network and built the space syntax model on these time nodes.Secondly,judged the axes level with accessibility and analyzed its changes.We used major cities to break long axis and the experimental result showed that the extended model was more applicable.Later,the space syntax model was constructed for these time nodes and the space syntax indexes were calculated by programming.In order to make qualitative measurement of accessibility,the accessibility of the axis was measured by using the value of connectivity and local integration so that the accessibility of traffic network on these time nodes was analyzed.The following conclusions were found in this paper:(1)China's regional accessibility center was not obvious in comprehensive consideration of a variety of transportation networks.Overall,the accessibility center located in Urban Agglomeration around Beijing-Tianjin-Hebei Region,the Yangtze River Delta,and Chengdu-Chongqing area.The axis value of global integration would continue to rise in the future.(2)Composed with Pearl River Delta Urban Agglomeration,traffic network structure was forming as crossing,and axis with good accessibility should gradually become the linear,planar distribution.(3)To improve the accessibility of traffic network was to intensify this diamond-type structure.Besides,high-speed railway and expressway should play major roles in traffic network expansion.We extended the traffic network of high-speed railway and expressway along development axes and tried to verify the conclusion.The result showed that the axial distribution pattern with good accessibility would become basically planar distribution so that the expansion plan of traffic network in this paper was turned out to be true.The significance of study mainly represents that contributing to the promotion of China's transportation network accessibility level.Besides,the transportation network in Chinese Mainland will get a better development trend through this research.Therefore,this study can provide some reference to the national road network planning and is able to provide decision support for the future development of the state planning.