长江中游城市群铁路交通与城市发展水平耦合协调关系

Coupling Coordination Relationship Between Railway Transportation Network and Development Level of the Urban Agglomeration in the Middle Reaches of the Yangtze River

长江中游城市群是中国国家重点城市群之一,承担着中部崛起和连通沿海城市与内陆城市的重任。城市群的高质量发展离不开区域一体化的作用,而铁路作为区域交通的主要方式之一,与城市群发展有密切联系。利用GIS等数据分析平台,通过研究2009年和2019年的长江中游城市群铁路交通网络和城市发展水平的时序发展和空间分异特征,分析两者间的耦合协调关系发现:①铁路干线具有显著的廊道效应,2019年武汉市、长沙市和南昌市3个省会城市的交通联系强度高,省内其他核心城市构成次级节点,其他城市成为三、四级节点;②长江中游城市群的城市发展以武汉市、长沙市和南昌市为核心,其周边城市的发展水平呈现“洼地式”分布;③长江中游城市群耦合协调度从多峰结构向单峰结构转化,并且有向中等耦合协调和低等耦合协调集中的趋势。在空间结构上,呈现出从南向北持续减弱、从西向东先升高后下降的特征,并且在各省份内形成了三级结构。

The urban agglomeration in the middle reaches of the Yangtze River is one of the national key urban agglomerations in China,which undertakes the important task of the rise of central China and connecting coastal cities with inland cities.The high-quality development of urban agglomeration is inseparable from the role of regional integration.As one of the main modes of regional transportation,railway is closely related to the development of urban agglomeration.By GIS and other data analysis platforms,we study the time-series development and spatial differentiation characteristics of railway transportation network and development level of the urban agglomeration in the middle reaches of the Yangtze River in 2009 and 2019,and analyze the coupling coordination relationship between them.First,the railway trunk line has a significant corridor effect.Wuhan,Changsha and Nanchang,the three provincial capitals,have high traffic connection strength,while other core cities in the province constitute secondary nodes,and other cities become third-and fourth-level nodes.Second,the development level of the urban agglomeration in the middle reaches of the Yangtze River takes Wuhan,Changsha and Nanchang as the core,and the development level of their surrounding cities presents a“depression”distribution.Third,the coupling coordination degree of the urban agglomerations in the middle reaches of the Yangtze River changes from a multi-peak structure to a single-peak structure,and tends to be medium coupling coordination and low coupling coordination concentration.In the spatial structure,it shows the characteristics of weakening from the south to the north,rising first and then decreasing from the west to the east,and forms a three-level structure in each province.