以湘江流域为研究区域，选取县级及以上城市为评价单元，运用 GIS 分析技术从公路网密度、邻近度、通达性3方面分别对各评价单元的差异进行分析，并利用以上3个指标构建区域交通优势度综合评价模型，分析湘江流域交通优势度的空间分布格局和特征以及其形成成因。研究表明：湘江流域路网密度整体较低，城市间差异较大；邻近度和通达性以地级市为中心呈圈层分布；城市间交通优势度极化严重，交通优势度较高的地区主要在长株潭城市圈、衡阳市及周边地区；整个流域交通优势度成“H”字型分布格局。%Xiangjiang river basin was selected as the study area, cities at or above county level were used as nodes, differences of transport network density, proximity, accessibility between counties were analyzed by GIS technology. Mathematical model of comprehensive evaluation of regional transportation advantage degree coming from the above three indicators was built to analysis the Xiangjiang river watershed spatial distribution characteristics and the cause of the traffic dominance. The results showed that transport network density was low overall; proximity and accessibility were lower and lower with the distance;transport superiority varies largely between cities, higher traffic advantages of region were mainly in Changsha-Zhuzhou-Xiangtan city circle, Hengyang city and their surrounding areas;the transport superiority of the whole basin showed a“H” distribution pattern.
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