长江干流县域交通优势度的空间格局

借鉴《省级主体功能区规划》的技术流程和评价方法，采用公路网络密度、交通干线影响度、区位优势度为评价指标，并通过引入地形起伏度因子修正交通优势度模型。在此基础上，以长江干流经过的29重点城市为研究区域，选取其下辖的108个县市为研究单元，综合运用GIS空间分析、建模和制图技术，分析了长江干流沿岸县域交通优势度的空间格局并解析了其成因。研究结果表明：从区域视角，长江干流县域交通优势度总体呈偏正态分布，空间上东西分异明显，干流途经县市交通优势度普遍偏高，东部地区县市的交通优势程度普遍高于西部地区，沿沪宁线和沿海地区较高，西部较高地势地区相对较低；从流域视角，具有下游集中偏高，中游分散较高，上游普遍偏低的特点；从行政区划视角，上海、南京和苏锡常地区下辖的县市的交通优势程度突出，中西部地区的武汉、和重庆中心城市下辖的县市的交通优势度较高，而离中心城市较远且缺少交通干线通过的县市的交通优势度较低。加强低值区的交通基础设施建设，加强各市与周边邻近省辖市的经济联系，从而提高长江干流县域城市的交通优势度水平，为长江流域城市发展和经济建设提供基础支撑和保障作用。

The Spatial Pattern of Traffic Superiority Degree of the Counties along the mainstreams of Yangtze River

The highway network density, the influence degree of the traffic trunk line and the location advantage degree are used as the evaluation indexes, and the traffic advantage degree model is modified by introducing the terrain fluctuation factor based on the technical process and evaluation method of the provincial main functional area planning. On this basis, taking 29 key cities along the main stream of the Yangtze River as the research area, 108 counties and cities under its jurisdiction as the research units, and the spatial pattern of county traffic advantage along the main stream of the Yangtze River is analyzed and its causes are analyzed comprehensively using GIS spatial analysis, modeling and mapping technology, The results show that: from the regional perspective, the traffic advantage degree of counties along the Yangtze River main stream is generally distributed in a normal way, with obvious spatial difference between the East and the West. The traffic advantage degree of counties and cities in the East is generally higher than that in the West. The traffic advantage degree of counties and cities along the Shanghai Nanjing line and coastal areas is higher, and the higher terrain areas in the West are relatively lower. From the perspective of river basin, the traffic advantage degree of counties and cities along the Yangtze River main stream is generally higher From the perspective of administrative divisions, the traffic advantages of counties and cities under the jurisdiction of Shanghai, Nanjing and Suzhou Wuxi Changzhou are prominent, while those under the jurisdiction of central cities of Wuhan and Chongqing in the central and western regions have higher traffic advantages, while those far away from the central city and lack of traffic trunk lines have lower traffic advantages 。 Strengthen the construction of traffic infrastructure in low value areas, strengthen the economic ties between cities and neighboring cities under the jurisdiction of provinces, so as to improve the traffic advantage level of County cities in the main stream of the Yangtze River, and provide basic support and guarantee for urban development and economic construction in the Yangtze River Basin.