SPATIAL-TEMPORAL EVOLUTION OF TOPOLOGICAL ACCESSIBILITY OF URBAN-RURAL ROAD NETWORK IN WUHAN METROPOLITAN AREA

Based on the urban-rural road network construction data in 1989,1995,2000,2005and 2010,the weighted road topology network graphs and evaluation model were built,and then the dynamic analysis of the network development and the study were performed on spatial layout alterations of the urban-rural road network within the last 20years in the Wuhan metropolitan area.The study revealed that urban-rural road network development level of Wuhan metropolitan area had been improved significantly since 1989and the development of Wuhan metropolitan area experienced the stages of tree net,loop net and net expansion.However,the spatial growth of road network was yet saturated,outward expansion and internal filling of urban-rural road network also had high potential.The gravity and center of accessibility was confined to the city of Wuhan with inconspicuous spatial displacement,macroscopically maintained the high stability,but its microscopic pattern had the unevenness and discontinuity.The spatial distribution of urban-rural nodes topological accessibility presented a dynamic change ofimbalanced-relatively balanced,but overall it still had the obvious spatial differentiation and agglomeration. Closely related to the level of urban-rural nodes growth and socio-economic development,the accessibility distribution of urban-rural road network in Wuhan metropolitan area had started to break the characteristics of core-periphery,presenting rank-circle development trends.With increasingly fierce competition among areas under the background of economic globalization,cities of Wuhan metropolitan area must join forces,laying a solid foundation for integrated development and work together to build a globally competitive region transport system, so as to form the urban-rural integration development relying on a well-developed transportation network.