Spatial structure characteristics of Chengdu-Chongqing urban agglomeration from the perspective of multi-dimensional factor flows
With the increasingly perfect transportation and communication facilities and rapid economic development,various factor flows more frequently between cities and form a city network,promoting the analysis of urban dynamic"flow"data to become a new paradigm for regional spatial structure research.Compared with single factor flow,multi-dimensional factor flows can depict the network connection and identify the spatial structure characteristics of the urban agglomeration from a more comprehensive perspective.This paper establishes networks of people flow,logistics flow,information flow,capital flow,technology flow,and comprehensive flow in the Chengdu-Chongqing urban agglomeration by integrating multi-dimensional geographic flow data such as Baidu Migration,express logistics routes,Baidu Index,headquarters-branches of enterprises,and paper cooperation.By using social network analysis to identify network node characteristics and combining rank-size rules to evaluate the scale structure of the urban system,and using kernel density analysis method to identify the main corridors of multi-dimensional factor flows,and combining advantage flow and density-based spatial Clustering of application with noise clustering analysis to analyze the spatial clustering characteristics of the Chengdu-Chongqing urban agglomeration.The results show that:In the multi-dimensional factor flow network,the hierarchical differentiation of each node is obvious.Chengdu and Chongqing are the central node cities,with prominent agglomeration and diffusion capabilities of multi-dimensional factor flow,while other cities are generally under developed.The interval between Chongqing and Chengdu has the strongest connection strength,followed by the interval of Chengdu,Chongqing,and 14 prefect ure-level cities,and the interval of 14 prefecture-level cities is the lowest.The main corridors of factor flow are the Chengdu-Chongqing development axis and the Chengdu-Deyang-Mianyang-Leshan urban belt.Under the constraint of the advantage flow,five spatial clusters are formed within the Chengdu-Chongqing urban agglomeration,including Chengdu-Deyang-Meishan,Chongqing-Guangan,Nanchong-Suining,Neijiang-Zigong-Yibin-Luzhou,and Leshan-Ya'an.Among them,Nanchong-Suining and Neijiang-Zigong-Yibin-Luzhou have the potential to develop into metropolitan areas.Based on the analysis results and existing plans,this paper suggests that Mianyang,Nanchong,and Yibin,which have relatively high centrality in the multi-dimensional element flow network,be cultivated as secondary central cities.While focusing on the development of the Cheng du metropolitan area and the Chongqing metropolitan area,efforts should be made to cultivate the two metropolitan areas of Nanchong-Suining and Neijiang-Zigong-Yibin-Luzhou,promote differentiated and characteristic development of urban gaps such as Mian yang,Ya'an,Leshan,and Dazhou,strengthen the development axis of Yibin-Luzhou-Chongqing along the Yangtze River,and gradually optimize the spatial structure of the Chengdu-Chongqing urban agglomeration,forming a new pattern of coordinated regional development.
spatial structuremulti-dimensional factor flowssocial network estimationrank-size rulekernel density analysis,density-based spatial clustering of application with noise(DBSCAN)Chengdu-Chongqing urban agglomeration
国家科技期刊平台
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