An Empirical Study On The Spatial Structure Of Beijing-Tianjin-Hebei Urban Agglomerations

At present,the regional main body of the urban agglomeration has become a special space organization for China's participating in the international competition and cooperation,and becoming the main carrier and supporting force in promoting regional economic development.In recent years,the building of urban agglomeration in china advances rapidly.Being one of the three major urban agglomerations in China,the development goal of Beijing-Tianjin-Hebei Urban Agglomeration is developing into a world-class urban agglomeration.As a complex regional system,whether the spatial structure is reasonable or not directly restricts its development.Thus,we need to explore what'is pattern of the spatial structure of Beijing-Tianjin-Hebei Urban Agglomeration and how to optimize and integrate it.At first,starting from the perspective of the essential connotation and general characteristics of the spatial structure in urban agglomeration,this paper summarizes related theories and research trends and makes clear the scope and field of the study in this paper.In addition,it briefly describes the spatial scope and general situation,and summarizes the status quo of the spatial structure in the subordinate element level.Moreover,the existing problems are pointed out.Besides,systematic measurement was being done for the spatial structure by employing the method of quantitative analysis.In terms of urban scale structure,the monopoly of city that ranks high is prominent,the development of the city that ranks intermediate is insufficient,and small cities that rank low are large in amount and small in scale,which shows that the distribution feature of city size is not reasonable.In terms of economic space,this paper indicates economic level with the quality of economic development,constructing an evaluation system with 24 indexes and measuring them with the method of entropy.The results show that the economic development level improves and the gap widen gradually.Thus,the unbalanced spatial development is outstanding and it is shown that a circled decreasing pattern with Beijing and Tianjin as the core is formed.In the aspect of inter-city spatial connection,by measuring the strength of spatial connection with the modified gravity model,this paper finds that the spatial connection tends to be centripetal and the network structure has not been formed.Finally,it proposes the path of spatial structure optimization and integration.That is,the pattern “corridor pattern and circling-layering pattern” shall be focused and the ultimate goal of “network pattern” shall be built.Meanwhile,corresponding suggestions are proposed from the four aspects of optimizing urban hierarchy system,improving industrial spatial layout,perfecting the supporting network of infrastructure and constructing regional coordinating system.