The Spatial Interaction And Economic Spatial Pattern Optimization Of Chang-Zhu-Tan Urban Agglomeration

Under the background of fast development of economic globalization and regional economy integration,Regional spatial interaction and economic spatial pattern have become the core and hotspot of geography research.The construction of urban agglomeration has become the mainstream and trend of global regional economic development.Urban agglomeration is also the main form of promoting new urbanization in China.It is of great significance to study the spatial interaction and economic spatial pattern of urban agglomeration in order to accurately judge the opportunities and challenges as well as the new trend and new characteristics of urban agglomeration development.The Chang-Zhu-Tan urban agglomeration is an important part of the Triangle of Central China,and has the objective advantages of building regional central urban agglomeration.This paper takes Chang-Zhu-Tan urban agglomeration as the research object,uses the improved gravity model to measure the spatial interaction intensity of each city;uses the "3D"(Density,Distance and Division)framework proposed by the World Bank Development report "reshaping the World Economic Geography" in 2009,and discusses the economic density pattern,economic distance pattern,economic integration pattern and the overall economic spatial pattern;and a suggestion of optimizing economic spatial pattern through "increasing density","reducing distance" and "reducing segmentation" is given.The main findings are as follows:(1)The spatial connection level of Chang-Zhu-Tan urban agglomeration is low.The spatial interaction has central directivity and proximity directivity,and the intensity of interaction is mainly affected by the economic scale of the city,the convenient degree of traffic and the proximity of the region.In addition,it is found that there is a positive correlation between the spatial interaction and economic development of Chang-Zhu-Tan urban agglomeration.(2)The economic density of Chang-Zhu-Tan urban agglomeration is on the low side as a whole,and the difference between cities is obvious,showing obvious spatial differentiation and unbalanced distribution characteristics.The spatial structure of "one core,one ring and many points" is formed.From the view of development direction,the core area of Chang-Zhu-Tan has a tendency of spreading north,east and west,but the diffusion to south is not obvious.(3)The highway accessibility of Chang-Zhu-Tan urban agglomeration shows obvious regional differences.The middle highway has better accessibility,and the northwest and southeast have poor accessibility.The reachability of the railway forms the "+ shaped" pattern of high accessibility around Wuguang high-speed railway station,extending to the Shanghai-Kunming High-speed Railway station,and radiating toward the periphery.The airport accessibility forms a "core-periphery" pattern centered on Changsha Huanghua International Airport and diffused to its periphery.On the whole,Chang-Zhu-Tan urban agglomeration has basically formed the economic distance pattern of "circle-level decline".Major transport infrastructure has a greater impact on accessibility.(4)The economic integration of Chang-Zhu-Tan urban agglomeration is relatively low,presenting a spatial pattern of "Center agglomeration,peripheral dispersion".(5)The whole group of Chang-Zhu-Tan urban agglomeration shows the hierarchical development pattern of "1+2+3+2".According to ladder division,Changsha,Zhuzhou,Xiangtan belong to the first level,Hengyang,Yueyang,Changde belong to the second level,Loudi,Yiyang belong to the third level.The spatial interaction results are highly consistent with the spatial pattern characteristics of "3D" framework.,which further verifies the scientific nature and applicability of the "3D" framework.(6)The optimization of economic spatial pattern of Chang-Zhu-Tan urban agglomeration should further promote the agglomeration of elements in the core area of urban agglomeration,construct the spatial pattern of multi-center networking,and form a comprehensive regional transportation network in Chang-Zhu-Tan urban agglomeration to improve the accessibility of traffic.It is necessary to strengthen the sharing of urban elements among the counties in the urban agglomeration,to integrate the industrial division with the market,and to promote the spatial connection and function coordination and complementation in the urban agglomeration by reducing the "segmentation".This paper combines the quality,distance,spatial connection intensity of gravity model with the density,distance and segmentation of"3D" frame,and study the spatial interaction and economic spatial pattern optimization.It provides a new perspective for the study of the spatial structure of urban agglomeration.However,this paper only analyzes the present situation of spatial interaction and spatial pattern of Chang-Zhu-Tan urban agglomeration and its optimization countermeasures,and lacks of further study on spatial and temporal evolution,characteristics and formation mechanism of spatial pattern of Chang-Zhu-Tan urban agglomeration.It needs to be further deepened in the future research.