高速铁路对长江三角洲空间联系格局演化的影响

The Spatial Connection Evaluation of Yangtze River Delta with the High-Speed Rail

基于交通流视角运用首位度、功能多中心指数、交通流量重心和集中化指数等分析方法,通过ArcGIS等软件分析了具有"同城效应"高速铁路网络对长江三角洲空间联系格局演化的影响。研究发现:1日趋完善的高速铁路网络增强整个区域的联系强度,不同城市间空间联系强度有一定变化,特别是南翼和北翼直接联系的提升使上海的节点功能降低甚至是消失,促进生产要素的自由流动和城市的协同发展;2赫希曼—赫芬达尔指数的降低,功能多中心指数的增加,交通流量重心在苏州境内向南京—杭州沿线的偏移,都说明高速铁路交通流量分布更加均衡,整个区域正在由单功能中心向多功能中心转变,但是与欧洲莱茵鲁尔地区等城市圈还存在一定差距;3集中化指数的降低表明高速铁路目前存在递增的边际效用,在当前阶段修建新的高速铁路比提高已有高速铁路的通行频次能更有效地促进长江三角洲一体化。

Transportation network system has significant effect in the connection of spatial structure of city circle. This paper which use the method of the urban primacy index,the multi- function centres index ,the centre of gravity and CI analyses the spatial connection evaluation of Yangtze River Delta with the High-Speed with the urban integration effect based on the traffic flow by ArcGIS. The results indicated：The connection of Yangtze River Delta has significantly been improved by The High-Speed Rail. There are different influence in cities, ShanShai has been lost the node function because of the direct connection between Jiangsu and Zhengjiang. The decreasing of HHI, the increasing of functional polycentricity index,the center of gravity transfer in Suzhou offset 11 kilometer in the northwest all show that the Yangtze River Delta which has disparity with the Rhine-Ruhr region is in the process of Single-function center to Multifunction Center. The decreasing of CI indicates that the high-speed railway has increasing marginal utility, the construction of new high-speed rail at this stage than improving the existing traffic frequency can be more effective in promoting the integration of the Yangtze River Delta.