The Influence of High-Speed Railways on Accessibility of Yangtze River Delta Region's Metropolitans
研究了长三角五个都市圈在有无高铁情景下的日通勤圈变化，发现高铁沿线城市时间收敛最明显，非站点城市也有微小改善，高铁使都市圈等时圈沿线路向外扩展。
This paper integrated method of cost weighted raster analysis was designed and applied to generate five metropolitans' daily communication rings with and with the operation of high- speed railways in Yangtze River Delta region. The valuation of accessibility was conducted with a coefficient based on the shortest travel time. After the valuation, differences between accessibility patterns with scenarios with and without high-speed railways were analyzed,and influences of the high-speed railways on five metropolitans' accessibility were discussed. The results indicated that cities along the high- speed railways became the biggest beneficiaries of time convergence, the accessibility of none station cities also promoted while in minutely. The isochronous rings of five metropolitans evolved outward along the high-speed railways, and the spatial scope showing the extend trend along the high-speed railways. High-speed railways would expand the isochronous ring, and the coverage of five metropolitans' daily communication ring almost attained one hundred percent in scenario of high- speed railway. The coverage of 1 and 2 hour- isochronous rings extended in varying degrees. This indicated that daily flow across the cities, andCity effectcan be achieved with the closer time distance among main cities inside or outside the metropolitans.