长江中游城市群城市网络空间结构研究

按照"点"→"线"→"面"→"网络"的分析思路,运用分形理论、引力模型、隶属度模型、空间句法模型、时间-空间可达性模型,研究2013年长江中游城市群31个城市的网络空间结构。结果表明:(1)在"点"层次上,长江中游城市群首位城市武汉为超大城市且垄断地位较强,城市体系呈序列型分布,规模结构呈"橄榄状"态势。(2)在"线"层次上,长江中游城市群城市联系整体偏弱,骨干联系由武汉、长沙、南昌组成,武汉城市圈、长株潭城市群和环鄱阳湖城市群内部城市间联系较强,3个省会城市与其腹地城市间呈星形结构特征。(3)在"面"层次上,长江中游城市群形成武汉、长沙、南昌3个辐射中心,在西北—东南方向呈现"中间高、两端低"的特征,武汉—南昌辐射连片趋势较明显。(4)在"网络"层次上,长江中游城市群城市网络的时间、空间可达性格局基本一致,与拓扑可达性存在一定偏差。时间、空间可达性格局中心向南、西北、东北方向沿长江河谷地带出现"波峰",受桐柏山、幕阜山影响在北、东南方向分布"波谷"。在路网的发育方面,武汉城市圈发育最好,长株潭城市群受地形影响最大,环鄱阳湖城市群发育最均衡。

Study on Spatial Structure of Urban Network in Urban Agglomeration in the Middle Reaches of the Yangtze River

The spatial structure characteristics of urban network among 31 cities of urban agglomeration in the middle reaches of the Yangtze River in 2013 were studied by using the fractal theory, gravity model, membership model, space syntax model, spatial-temporal accessibility model in accordance with the "point"→ "line" → "surface" → "network" analyzing thought.The results showed that urban agglomeration in the middle reaches of the Yangtze River had significant characteristic and regularity: (1) On the "point" level, the urban system of urban agglomeration in the middle reaches of the Yangtze River showed a sequence type distribution, and structure of urban scale showed a "olive-shaped" feature, primate city Wuhan was a megacity, its monopoly status was stronger.(2) On the "line" level, the strength of city interaction was a little weakness as a whole, Wuhan, Changsha, Nanchang composed of backbone of the network interaction.The internal interaction of Wuhan Metropolitan Area, Greater Changsha Metropolitan Region and Poyang Lake urban agglomeration were stronger.The structure characteristics appeared star-shape between three provincial capital cities and its hinterland cities.(3) On the "surface" level, urban agglomeration in the middle reaches of the Yangtze River formed Wuhan, Changsha, Nanchang as the three main radiation centers, and from the northwest-southeast direction presented a "high in the middle, low at the ends" radiation character.Radiation continuous trend of Wuhan-Nanchang was obviously.(4) On the "network" level, the urban network of urban agglomeration in the middle reaches of the Yangtze River existed deviation between topology and spatial-temporal accessibility.The pattern of spatial and temporal accessibility were similar, the center of pattern appeared the "crest" along the Yangtze River valley from the south, northwest and northeast direction, and the "trough" distribute in north and southeast under influenced of Tongbai Mountain and Mufu Mountain.Compared the situation of development in regional road network, the road network of Wuhan Metropolitan Area evolved the best, Greater Changsha Metropolitan Region most affected by the terrain, Poyang Lake urban agglomeration developed the most uniformly.