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在县级空间尺度下,采用加权平均出行时间、经济潜力和到上海出行时间三种可达性指标,评估高速铁路对长三角地区陆路可达性的影响。并进一步将可达性变化与经济发展水平格局进行比较分析,讨论高铁引起的可达性变化对区域经济发展格局的可能影响。结果表明,高速铁路提升了长三角地区整体可达性,且能缩小区域间可达性的差异;高速铁路对不同经济发展水平区域可达性的提升存在差异。整体上,高铁对经济发展水平较低区域的加权平均出行时间和到上海的出行时间的提升更为明显,有利于经济发展水平较低区域接受其他区域尤其是上海的经济辐射和带动效应;但对经济潜力的提升则在经济发展水平较高区域更为明显,这一趋势可能会导致长三角地区经济发展水平格局的进一步极化。
Under the county-scale spatial scale, we use weighted average travel time, economic potential and travel time to Shanghai to assess the impact of high-speed railway on land accessibility in the Yangtze River Delta. And further comparative analysis of changes in accessibility and the level of economic development to discuss the possible impact of high-speed rail accessibility changes on regional economic development pattern. The results show that the high-speed railway enhances the overall reachability of the Yangtze River Delta region and reduces the difference of accessibility between regions. The improvement of accessibility of high-speed railways to different economic development levels is different. On the whole, the HSR’s weighted average travel time in areas with lower levels of economic development and the travel time to Shanghai are more obvious, which is conducive to accepting the economic radiation and driving effects of other regions, especially Shanghai, in areas with lower levels of economic development. However, The improvement of economic potential is more obvious in the regions with higher level of economic development. This trend may lead to further polarization in the pattern of economic development in the Yangtze River Delta.