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The Organization Characteristics and Evolvement of Regional Rail Transit Network Structure of Chengdu-Chongqing Urban Agglomeration

WANG Yafeng;HUANG Yong;SHI Yaling;  
As the main infrastructure of urban transportation system, regional rail transit network has an important influence on the shaping of regional spatial structure. Taking the passenger fl ow organization as the starting point, organizational characteristics and evolvement of rail transit network structure are analyzed from 4 aspects of centrality, vulnerability,distribution of subgroups and accessibility. Some results have been found:(1) Centrality.Density of regional rail transit network has reached the lowest value. Network right focuses on a few cities, and the level of control of urban resources is obvious.(2) Vulnerability. Network vulnerability period is not stable and network stability is the strongest of all periods in 2014.(3) Distribution of subgroups. In different periods, distribution of urban subgroups is different,and 3 major urban subgroups of Chengdu-Deyang-Mianyang-Leshan City Zone, Southeast of Chongqing and Chongqing metropolitan area are formed initially.(4) Accessibility. Network expansion potential and the overall accessibility have reached the historical optimal level.Accessibility of the fi rst urban space experiences the dynamic evolution process from Neijiang,Rongchang, Ziyang, Chongqing to Tongnan.(5) Stage division. Regional rail transportation development can be divided into 4 stages: steady construction, optimizing, extension and networking period.
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