陆路高速交通对长江三角洲城市群中心城市一日交流圈的影响

The Influence of Land High-Speed Traffic on the Daily Communication Area of Center Cities of Urban Agglomeration in Yangtze River Delta

陆路高速交通极大拓展了城市一日交流圈,并促进区域一体化。该文选取1995、2005、2015年3个时间断面,运用GIS成本加权栅格算法,对比分析3种假设情境路网下(2005年无高速公路网、2015年无高速公路和高速铁路网、2015年无高速铁路网)和3个时间断面实际路网(1995年、2005年和2015年)下的中心城市一日交流圈范围,引入可达性提升率和贡献率两个评价指标,分析陆路高速交通对长江三角洲城市群中心城市一日交流圈的真实拓展程度与特点。结果表明:陆路高速交通作用下,长江三角洲城市群中心城市一日交流圈呈现不规则放射状格局,沿陆路高速交通干线轴向突进式拓展;高速公路和高速铁路提升率和贡献率进入"高速时代",长江三角洲城市群中心城市一日交流圈拓展对陆路高速交通依赖性增强;陆路高速交通方式多样化发展,贡献支撑作用出现分化,中心城市一日交流圈的拓展动力主要来源于高铁。

Land high-speed traffic has greatly expanded the city′s daily communication area and promoted regional integration.Based on the evaluation index of accessibility in this paper,the expansion extent and characteristics of the central cities of urban agglomeration in Yangtze River Delta from 1995 to 2015 attributed to the impact of land high-speed traffic were analyzed by using GIS cost-weighted grid algorithm and comparative analysis.The result shows that the expansion of land high-speed traffic is significant,and daily communication area of center cities of urban agglomeration in Yangtze River Delta expand sharply along the axial of land high-speed traffic trunk.Promotion rate and contribution rate of high-speed rails and highways go into the "high-speed era",and the expansion of daily communication area in Yangtze River Delta shows high dependence on high-speed traffic.Accompanied with the diverse development of land high-speed traffic,contribution support is differentiated.The expansion motivation of daily communication area of the center cities is mainly from high-speed rail.