辽宁省陆路交通可达性及其对城市经济联系影响研究

THE LAND TRANSPORT ACCESSIBILITY OF LIAONING PROVINCE AND ITS INFLUENCE ON URBAN ECONOMIC TIES

基于ArcGIS,采用最短距离、可达性、可达性系数3个指标,从可达性基本格局和空间差异两方面研究2011年辽宁省57个县级以上经济中心的可达性状况,并探讨可达性对城市经济联系强度的影响。结果表明:(1)辽宁省可达性呈现出以辽阳为中心,向外围逐渐递减的"中心-外围"格局,通过对中心性与综合可达性进行拟合分析发现"中心性"是影响可达性的一个重要因素。(2)可达性与最短距离分布不一致,快速交通线网的发展大大改善了中心性较差城市的可达性状况,使可达性分布呈现一定的高等级道路指向性。(3)利用直线距离和可达性分别计算出各城市经济联系强度并进行对比,将可达性对城市经济联系强度的作用划分为:促进型、协调型和制约型。

Based on ArcGIS,the paper studied accessibility status of 57 economic centers of counties and above from two aspects of accessibility＇s basic framework and spatial difference in Liaoning province during 2011 by using three indicators of the shortest,the accessibility and the accessibility coefficient. At the same time,it discussed its effect on urban economic contact intensity. Results showed that：（ 1） The accessibility of Liaoning province roughly presented the ＂center- periphery ＂pattern. It gets Liaoyang as the center,and then decreases gradually from city center to the local part. Through a joint analysis of the centricity and comprehensive accessibility,we reached a conclusion that the ＂centrality ＂was an important factor to accessibility.（ 2） The distribution of the accessibility and the shortest distance were inconsistent. The development of rapid transit network had greatly improved the accessibility status of the cities which is in poor centrality,and made the accessibility distribution presents the directivity of high- grade road.（ 3） Calculated the urban economic contact intensity with linear distance and accessibility and made a comparison between them. The impact of the accessibility to the economic contact intensity can be divided into three types of promotion,coordination and restriction.