A Comparative Study Of The Spatial Structure Of Beijing-tianjin-hebei Urban Agglomeration:A Popluation Flow Perspective

As a higher-level regional spatial organization form in regional economic development,urban agglomeration plays an increasingly important role in international competition and cooperation.As the third largest regional growth pole in China,the Beijing-Tianjin-Hebei urban agglomeration has become the largest urban agglomeration in northern China.The scale,direction and geographical distribution of population flows in the Beijing-Tianjin-Hebei urban agglomeration have significant characteristics,which have a significant impact on the spatial linkage and spatial layout of urban agglomerations.Studying the spatial linkage and spatial layout of the Beijing-Tianjin-Hebei urban agglomeration from the perspective of population flows provides a new research idea for objectively evaluating the spatial structure of the Beijing-Tianjin-Hebei urban agglomeration,and which has important theoretical and practical significance for building a world-class urban agglomeration with Beijing as its core.On the basis of summarizing the previous theories about urban agglomeration construction,the thesis selects 13 cities above the prefecture level of the Beijing-Tianjin-Hebei urban agglomeration as the research object,and takes 26 cities above the prefecture level in the same period of the Yangtze River Delta urban agglomeration as the reference object.First,the thesis sets out the urban centrality evaluation index system by combing the factors affecting the urban centrality level to measure the urban centrality levels of two different urban agglomerations of the Beijing-Tianjin-Hebei and the Yangtze River Delta in 2017,and to measure the urban centrality level of the Beijing-Tianjin-Hebei urban agglomeration in two different years in 2012 and 2017.Secondly,the thesis revises the gravity model from the perspective of population flow,and based on this,measures the intensity of urban economic linkages between cities in two different urban agglomerations of the Beijing-Tianjin-Hebei and the Yangtze River Delta in 2017,and measures the intensity of urban economic linkages of the Beijing-Tianjin-Hebei urban agglomeration in two different years in 2012 and 2017.Finally,based on the data on the intensity of urban economic linkages between cities measured by a modified gravity model,the thesis uses UCINET—a social network analysis software to measure the economic linkage network density,network centrality and agglomerated subgroups in two different urban agglomerations of the Beijing-Tianjin-Hebei and the Yangtze River Delta in 2017,and to measure the economic linkage network density,network centrality and agglomerated subgroups of the Beijing-Tianjin-Hebei urban agglomeration in two different years in 2012 and 2017.In summary,the urban centrality,the intensity of urban economic linkages and the overall network of the Beijing-Tianjin-Hebei urban agglomeration are compared from the horizontal and vertical perspectives to comprehensively evaluate the spatial linkages and spatial structure characteristics of the Beijing-Tianjin-Hebei urban agglomeration in2017.The research results show that there are still defects such as uneven geographical distribution of economic development level and relatively low level of urban economic linkages of the Beijing-Tianjin-Hebei urban agglomeration in 2017.However,the urban agglomeration has initially formed a relatively complete urban central hierarchical structure and urban agglomeration economic linkage hierarchical structure.In the regional distribution,the spatial structure of the urban agglomeration of “three axes and two zones”is initially formed,including the three development axes of Beijing-Langfang-Tianjin,Beijing-Tangshan-Qinhuangdao,Beijing-Baoding-Shijiazhuang-Xingtai-Handan,and the urban development zone of the north of Hebei Province with Beijing and Tianjin as the center and the urban development zone of the middle and south of Hebei Province with Shijiazhuang and Handan as the center.Based on this,the thesis proposes relevant policy enlightenment from the three aspects of “point”,“line”,and “flat” of urban agglomeration construction,in order to provide a theoretical reference for the construction of Beijing-Tianjin-Hebei world-class urban agglomeration.