| Jiangsu is one of the most dynamic and fastest urbanization areas in China. With the "Jiangsu coastal development planning", "Yangtze River Delta regional planning" gradual implementation, the development zone along Yangtze River, Shanghai-Nanjing, coastal, east Longhai Railway, and Grand Canal, that are coincided and intertwined in the space axis of Jiangsu Province, the Yangtze River Delta and the national level, the spatial pattern of development will be adjusted in Jiangsu Province. Analysis the axis and the urban system of Jiangsu province, and discussion the urban development and its mechanism of interaction between the evolution of spatial pattern, is a major issue of Jiangsu.Transport infrastructure affects the urban spatial pattern significantly, but limited to the lack of technical methods, the coupling relationship has not been well clarified. It is necessary to innovate for theories and methods of accessibility, and to reveal different regional effects of transport infrastructure. On this basis, the paper builds a coupled model between transportation infrastructure and urban spatial pattern, and provides a targeted technical and methodological support for the depth and quantitative study of spatial structure. There all are the objective and value of the study.Through exploratory spatial data analysis, we found that the regional differences in urban development in general has experienced increased volatility and slow down in two stages, the spatial pattern of urbanization level of Jiangsu Province is successive decline from the South Jiangsu to Middle Jiangsu,and to North Jiangsu. With the method of spatial association, Jiangsu Province can be divided into four different types. Such is diffusion type, polarization type, backward type, and trough-type. By the principal component analysis and cluster analysis, the features of the city's comprehensive strength are that, the first degree is decline, the gap between the city's is narrowing, the north-south differences is increasing, and the integrated development pattern is appeared in the south Jiangsu.Based on the Grid-based methods of accessibility analysis, we exploit software named AccAVG by using VB to measure accessibility. The results showed that the accessibility has improved quite different among north-Jiangsu, middle-Jiangsu and south-Jiangsu. The accessibility of south-Jiangsu is improved better than north-Jiangsu. Throughout the study period, the accessibility of middle-Jiangsu is improved behind the southern-Jiangsu and northern Jiangsu. By analyzing the correlation between the construction of highway network and the accessibility, the conclusion can be put forward that the effect of traffic construction is applicable to the principle of diminishing marginal utility. Increase traffic investment in backward areas contributes to the achievement of the regional benefit. By using the spatial analysis technology of GIS and the VB programming language, straight-line distance and accessibility data are extracted between each of the 65 cities in Jiangsu Province. The accessibility between each of cities in Jiangsu Province is improved significantly, and the structure is evolved from "spindle type" to "down payments type", the gap of accessibility continued to narrow, the cities contact each other more strongly. Natural conditions and regional conditions are the factors of the accessibility's improvement. Differences in the development of transport infrastructure, lead to the changes of city's accessibility and regional advantages.The view of accessibility leads to a dynamic topology of urban spatial structure broke the constraint of that the method of the fractal analysis can only be compared between the horizontal regions, can not make a vertical comparison within the same region. That provides a scientific basis to the fractal analysis that can be applied to the evolution of urban spatial structure. The study of cluster dimension on the three central cities (Nanjing, Wuxi and Xuzhou) in Jiangsu Province, reflected the traffic investment preference in the last 20 years of transportation construction process, also verified the changes of fractal agglomeration can response the changes in traffic conditions. The comparative analysis based on straight distance and accessibility distance found that the correlation dimension based on accessibility is better characterizing the changes of transportation construction in Jiangsu Province. The spatial contact patterns of Jiangsu Province based on accessibility changes more significant than that based on straight distance. High-level connection of cities in Jiangsu Province has significant disparity in different regions, and the number of the high-level connection is reduced from south Jiangsu to north Jiangsu. The gravity center of high-level connection moved from southwest to southeast, the advantages of Nanjing is weakening and that of Suzhou, Wuxi and Changzhou is upgrading. Shanghai makes significant effect to the development of Jiangsu cities, and especially leads the cities adjacent to Shanghai an obvious development. Through the contact network of high-level connection of cities, the conclusion can be found that the regional integration pattern of Suzhou, Wuxi and Changzhou has been formed. The membership of urban spatial connection changes by many factors, such as the center of the region, the city's comprehensive strength, the urban density surrounding the city, and the accessibility of high-level cities. According to the membership changes of urban spatial connection, the cities of Jiangsu Province can be divided into four types, such as continuous increase, continuous decrease, and volatility up and down.Based on the largest affiliation, the paper proposed a method named "bottom-up" to classification the city's hinterland. The basic idea of the method is that determined regional ownership based on the maximum contact direction at first, and then takes gradual merging of the center obtained by the results of different levels.The method excluded the human impact in the classification of center cities, and the city's comprehensive strength and the location can be squared up. The method of "Top-down" includes the shortest time distance and the field intensity model. The shortest time distance does not consider the city's differences in the same grade. Based on the method improvement, a method of field model has been proposed. The scientific thought of the new method is that dividing the cities into different level at first, and then, fully consider the overall strength index of the same grade cities, so that the results can be more accurately. The evolution of urban hinterland of Jiangsu cities has been analysis as an empirical by using the three methods.The traffic dominance includes regional accessibility, transportation routes dominance and regional Advantages. According to the level of urban development and the coupled index of the transport dominance, The 65 cities of Jiangsu province can be divided into three types, such as traffic lagged, coordinated development and traffic ahead. Coupling index reflects the ability of transportation support, the higher urban development relative the higher economic development and the transport demand. Conversely, low levels of urban development leads to the smaller regional transport. Therefore, that shows the economically developed areas relatively an inadequate transportation.Based on the data provided by Chris Taylor, thanks to the help of the accessibility analysis method, the potential location of the Center model has been simulated. The results show that when the demand is stable, there will form around a low-cost area round the high-grade center, and explained the internal mechanism that city agglomeration can be from easily round the high-grad center than that far away the high-grade center. In the case of Shanghai and Jiangsu, the paper finds that the evolution of urban spatial structure toward the more recent from Shanghai, the city more close to Shanghai, the city's comprehensive strength is stronger, and city's grade is higher. The negative correlation between high-level centre (Shanghai) and the comprehensive strength up to more and more significant, and the theoretical simulation of center model is verified. Through the theoretical simulation and the example shows, the paper analysis the evolution of urban spatial structure based on the implementation of transport planning in Jiangsu Province. The paper concluded that the urban spatial pattern which appearance "golden corner, silver side and grass belly" will persistence in the planning period. The of The advantages of urban development is gradual process as near Shanghai-South Jiangsu-Middle Jiangsu-North Jiangsu (East Longhai railway)-other regions. |
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