1987—2017年兰青—青藏线青海段可达性时间空间格局及其演化

Accessibility Time-spacial Pattern and Evolution in Lanqing-Qingzang Line Qinghai Segment from 1987 to 2017

用加权平均旅行时间方法,对1987,1997,2006,2017年青海省境内兰青—青藏线沿线城镇的可达性及其演化进行研究.结果表明,整体上可达性水平从西宁与海东地区向西部地区递减,西宁的可达性水平优于其他城镇;可达性时间整体缩短,不同的时段、不同的站点,可达性时间的变化存在差异,可达性时间30 a平均下降46.05%,可达性水平显著提高;2017年55.56%的城镇可达性系数小于1,可达性水平优于平均水平;1987—2017年可达性水平均衡性提高.

With the method of weighted average travel time,the article studied the accessibility and evolution of the cities and towns along the Lanqing-Qingzang Railway Line in Qinghai province in 1987,1997,2006,2017.The result shows that,the overall accessibility level decreases progressively from Xining and Haidong Prefecture to west area,and Xining has superior accessibility level than other cities and towns in Qinghai;the accessibility time shortens as a whole and variations exist in different time frames and stations,and the time of accessibility averagely drops 46.05%,showing that the level of accessibility improve significantly;55.56%of the cities and towns has accessibility coefficient less than 1 in 2017,and the accessibility level is superior to average level;the accessibility level from 1987 to 2017 improved evenly.