The internal and external relations and spatial structure heterogeneity of the three major urban agglomerations in the Yangtze River Economic Belt:From the perspective of railway passenger transport big data
Based on big data for rail passenger transportation,this paper explores the spatial linkages among three major urban agglomerations of the Yangtze River Economic Belt,Includ-ing the Yangtze River Delta,the Middle Reaches of the Yangtze River City Agglomeration and the Chengdu-Chongqing City Agglomeration,as well as their spatial structural heterogeneity,from the intra-and extra-group perspectives.The results show that:① The three major city ag-glomerations have stronger in-group links than out-group.There are predominantly intra-provin-cial links in both the Yangtze River Delta and the Middle Reaches of the Yangtze River City Ag-glomeration.The Chengdu-Chongqing city agglomeration has stronger inter-provincial links than intra-provincial links.However,the intensity of inter-provincial links within the three city agglomerations is much higher than that outside the agglomerations,implying that under the ef-fect of the mechanism of internal agglomeration,cities within the city agglomerations are more likely to break through the provincial boundaries to create links and realize the integrated devel-opment of the region.② The intensity of intra-cluster and extra-cluster linkages of large city clusters reaches its highest at inter-city distances of 0-100 km and 0-300 km,respectively.And the intensity of in-group and out-group links between cities in the Yangtze River Delta and the Middle Reaches of the Yangtze River city agglomerations follow the law of distance decay,but in the Chengdu-Chongqing city agglomeration,only the out-group linkage conforms to this law.③ Megacities dominate the in-group and out-group links of the three major urban agglomera-tions.In the in-group and out-group links,the urban connection intensity of the three major ur-ban agglomerations at the same level is proportional to the city size,while the cross-level urban connection intensity is inversely proportional to the series difference.④ The spatial structures of the Yangtze River Delta and the Middle Reaches of the Yangtze River City Agglomeration are polycentric,though the extra-cluster linkages have a reinforcing effect on the polycentric struc-ture of the former.The Chengdu-Chongqing City Agglomeration has a"single-core"form in the view of intra-group linkage,and a"double-core"structure in the view of extra-group linkage and total linkage,indicating that the extra-group linkage is pushing the Chengdu-Chongqing City Ag-glomeration to change from a"single-center"to a"double-center"structure.
urban agglomerationspatial correlationspatial structurerailway passenger traf-fic flowthe Yangtze River Economic Belt
NETL
NSTL
万方数据
