Research Of Urban Netqork Of The Yangtze River Delta Based On Railway Network

With the development of economic globalization and informatization,the city as a complex and open system, its development is closely connected with other area of the contact. Contact and embodies the city attracted or rely on the city to surrounding areas, the greater the contact area between cities in intensity, more conducive to improve the urban density, promote the formation of urban agglomerations. Regional spatial relation and spatial interaction becomes a focus in the study of regional geography, economic geography and so on, More and more scholars through the structure features of urban networks to reveal the level of urban system and its structure.However, the modern communication facilities and advanced conditions such as traffic network is city contact support, the flow of elements such as population, information, resources and economic ties is the main content of it. Railway transportation as an important part of city to contact, it is not only for the population of the city, the flow of goods, shows more complex spatial network structure.As China’s first big economic zone as well as the biggest area of opening up, the Yangtze river delta took the lead among the world-class urban agglomeration, taking it as the research object, analyzes its representative urban network structure.The article in the perspective of railway transport links, take the 16 cities of the Yangtze river delta as the rail traffic network nodes, and make the urban rail transport links between the strength as a measure of relationship strength among the cities in 2006 and 2013,and analysis of the network density, centricity, core-edge structure, condensing subgroup between the Yangtze river delta and the provinces urban rail transport links by social network analysis methods of regional rail transit network. to discuss regional urban network structure, and the scientific of the railway network centricity and intensity of urban function fitting inspection level system, further to explore the relationship between rail transit network and the urban development.Research shows that:1,The rail transport network interconnected and in this period of time to further strengthen of the Yangtze river delta in 2006-2013. Including internal contact network relationship increase in the number 49, network density increased by 0.24. Communication network number increased the article 56, network density is raised 0.13.2, The hierarchy is obviously in the Yangtze river delta, and with the urban rail traffic construction changes occurred in the network level structure and internal network and external network and there exist certain differences in 2006-2013.3, Through the condensing subgroup analysis of the Yangtze river delta city network found that the change of the rail traffic lead to internal structure has certain change, but the long triangle area structures is still relatively stable. Eventually formed by Shanghai, east zhejiang urban agglomeration and urban agglomeration of northern urban agglomerations composed of structures.4, According to the core-edge structure analysis results of the Yangtze river delta rail transit network, the Yangtze river delta cities can be divided into core, half edge area, edge area, among them,Shanghai, Wuxi, Suzhou, Nanjing in the core network, and Nanjing joins the core from the edge of the area in 2013;The half edge area including Hangzhou, Jiaxing, Ningbo, Changzhou, Zhenjiang, Shaoxing,the edge area including Nantong, Taizhou, Huzhou, Taizhou, Yangzhou. And the core-edge structure of the network of Yangtze river delta changed a little in 2006-2013.5. The centricity of the Yangtze river delta urban network based on railway transport links and the central city functions be positive correlation, But due to the defects of the model fitting degree is not high. Because most of the cities belongs to the rail traffic construction advanced or delayed type city, its the main reasons for the low correlation between railway contact network centricity in the Yangtze river delta and the intensity of urban functions. Overall, the fitting degree were increased between urban network of internal network and external network centricity, and the intensity of urban function in 2006-2013, Illustrate the Yangtze river delta in continuously strengthen infrastructure construction, and railway traffic in the cities and gradually coordination and its social and economic development.This article is divided into six chapters four parts, the main contents are as follows:The first part includes the first chapter and the second chapter, of which the first chapter is the introduction part, the paper put forward the research background and significance, elaborated the paper research content and structure, and to define the scope of this article, technical route, and the research methods and the innovation of the article point is discussed; The second chapter for the domestic and foreign research review part, from the urban network, railway transportation, as well as the method of social network analysis three aspects and reviews related research progress.The second part consists of chapters 3 and 4, respectively on the Yangtze river delta between 16 city rail transit network as well as the Yangtze river delta region and the provinces will intercity rail transit network from the network density, centricity, core-edge structure and condensing subgroup social network analysis, reveal the long triangle area city network structure characteristics. respectively, the long triangle area between 16 city rail transit network and the Yangtze river delta region and the provinces will intercity rail transit network from the network density, centricity, core-edge structure and condensing subgroup social network analysis, reveal the long triangle area city network structure characteristics.The third part is the fifth chapter, based on the above railway traffic network of urban centricity index and based on the macro industry data and get the intensity of urban functions of coupling, it is concluded that the correlation coefficient between, then evaluate the fit of high and low, and explain the reason.The fourth part is the sixth chapter, carries on the summary, this study pointed out the shortage of research and looking to the future research direction.