高速铁路影响下的长三角城市群可达性空间格局演变

交通网络体系对城市群空间结构的优化有重要作用，随着“高铁时代”的到来，长三角城市群区域空间结构也将发生深远的变化。引入可达性的概念，以现状2010年与规划2020年的长三角综合交通设施网络为基础，选取长三角各城市之间加权平均最短旅行时间为度量指标，分析了高速铁路系统的发展对长三角区域空间格局未来演化的影响，揭示了高速铁路将全面提升长三角区域可达性水平，大大缩短城市之间的时空距离，推动长三角一体化发展，并通过都市圈、经济轴带的形成与发展，促进区域均衡化空间结构的形成。另一方面，虽然高速铁路将推动多中心空间结构的形成，但对城市可达性水平的影响具有明显的区域差异，城市在新的高铁格局下应探析符合自身特点的发展战略

RESEARCH INTO SPATIAL PATTERN CHANGES OF YANGTZE RIVER DELTA’S ACCESSIBILITY UNDER THE IMPACT OF HIGH-SPEED RAILWAY

Transportation network system has significant effect on the optimization of spatial structure of urban agglomeration.With the approaching High-Speed Railway Age,the Yangtze River Delta regional spatial structure will changes significantly.With the introduction of the concept of accessibility and the measurement factors of weighted shortest travel time of the transport network of 2010 and 2020,this paper concludes that the development of High-Speed Railway has the following effects on the Yangtze River Delta regional spatial structure.First of all,High-Speed Railway completely enhances accessibility within the Yangtze River Delta area,greatly shortens temporal and spatial distance between cities,promotes the integrated development of the Yangtze River Delta and boosts formation of regional balance of the spatial structure by formation and development of metropolitan area and economic developing axis.Secondly,High-Speed Railway accelerates the formation of multi-central spatial structure,but it differently affects the accessibilities of different cities.So,different cities should seek their own development strategies according to their different characteristics under the High-Speed Railway Age.