Research On The Influence Of "three Railways" Connection On Regional Spatial Connection

The rapid prototyping of network layout of high-speed railway,intercity railway and subway declares the forthcoming era of "Three kinds of rail traffic" of China.Its development will rebuild and adjust the spatial distribution and spatial combination of various kinds of economic activities in China,the spatial relationship between different levels of economic core area and surrounding areas will change around the "Three kinds of rail traffic" network.As an important component of urban agglomerations in the Yangtze River Delta,Nanjing and its metropolitan area is the only inter provincial metropolitan areas in China,which plays an important role in the development strategy of the national Yangtze River economic belt due to its special geographical location and abundant city type.With the rapid expansion of the local network,the full overlay "Three kinds of rail traffic" network will be formed in Nanjing by the end of the decade.Under this background,it is of great significance for the productivity spatial distribution and the space development of urban system generated by the "Three kinds of rail traffic" era of Nanjing to investigate the influence of "Three kinds of rail traffic" network on the regional spatial patterns of Nanjing and discuss specific countermeasures.Taking 11 districts in Nanjing as the main objects,this paper focuses on three major problems by means of ArcGIS spatial analysis and questionnaire survey,which include the influence of "Three kinds of rail traffic" construction on Nanjing's internal accessibility,the evolution on the spatial relationship between Nanjing and other cities of the metropolitan area and the passengers' subjective feelings of the "Three kinds of rail traffic" network and relevant countermeasures and suggestions.Some main results are presented as follows:(1)From the angle of the accessibility evolution of districts to high speed rail stations,both the accessibilities of districts to Nanjing station or Nanjing south station and inter district have been improved significantly.The rate of average accessibility improvement in each district is quite different.(2)From the angle of the accessibility evolution of districts in Nanjing to other cities of the metropolitan area,the external accessibility of all districts improves slowly at a relatively balanced speed.(3)The evolution of the external spatial contact pattern of districts in Nanjing reflects that the external spatial contact of districts increase remarkably and the urban contact center of high intensity sustains in the east.The total volume of spatial contact between districts in Nanjing and Zhenjiang,Yangzhou and Huai'an comes into prominence.The influence of Ma'anshan,Chuzhou and Wuhu on districts in Nanjing increases gradually while the influence of Xuancheng is relatively diminished.(4)The overall evaluation of "Three kinds of rail traffic" transship satisfaction analyzed from the questionnaire data is fairly satisfied.The evaluation of the indication information effectiveness and emergency response arrives quite satisfied.The walking time to the nearest subway station,convenience,ticket price and waiting time are evaluated as satisfied.While the congestion,infrastructure configuration and the overall service of staff in transfer station only get the general satisfactory evaluation.(5)The prominent issues faced by the transship mode can be given as follows.The network layout of "Three kinds of rail traffic" has been basically formed,but the distribution of subway lines is not balanced and the improvement speed of each district is quite different.The growth rate of cities in Nanjing's metropolitan area is not balanced,some individual cities grow relatively slowly,which weakens the spatial contact correspondingly.The intelligent equipment is still insufficient and the infrastructure construction needs to be improved.These problems mentioned above need to be focused on and solved one by one.(6)The optimization methods of regional spatial pattern in the era of "Three kinds of rail traffic" can be developed mainly on two aspects.On one hand,programming more reasonable subway distribution by increasing auxiliary route.Building the large platform for the external cooperation of the metropolitan area and strengthening the opening and cooperation of the portal area based on the Huaiyang and Ning'an high speed rail.On the other hand,strengthening the artificial intelligence service and infrastructure construction.