基于干线公路和铁路网的中国省会城市的交通通达性研究

A Study of Chinese Provincial Cities' Accessibility Based on National Trunk Highway System and Railway Network

以"最短路径模型"为基础,选取距离特征指标,分析基于主要铁路和干线公路网的省会城市交通通达性.从空间格局来看,铁路和干线公路的交通通达性都呈典型的同心圆模式,通达性最好的省份城市是接近中国大陆几何中心的郑州;而通达性较低的省份城市主要分布在西北、东北和海南省等边疆地区.交通通达性直接影响城市区位优势的发挥,增强边疆地区省会城市的交通通达性将有利于缩小区域发展的差距.

Based on ＂the most short-circuit path model＂ and selected the distance index,the spatial structure of provincial cities＇ accessibility based on national trunk highway system and railway is analysed.The spatial structure of provincial cities＇ both accessibility manifests the obvious concentric layer structure with the most accessible city Zhengzhou which is near the geometry centre of mainland and with the less accessible cities which are main located in Northwest,Northeast and Hainan etc frontier area.Accessibility has direct impacts on urban location strengthen,so improving the accessibility of frontier provincial cities will benefit for reducing the regional development gap.