| Promoting the high-quality development of Changsha-Zhuzhou-Xiangtan region will lead the high-quality development of Hunan province,deeply integrate into major national strategies such as "Belt and Road",the development of the Yangtze River Economic Belt,the GuangdongHong Kong-Macao Greater Bay Area,and the integrated development of the Yangtze River Delta,and accelerate the construction of a regional economic pattern featuring complementary advantages and high-quality development.However,the problem of unbalanced and inadequate development within the region still needs to be solved.Therefore,it is of great significance to analyze the development of Changsha-Zhuzhou-Xiangtan urban agglomeration and clarify its spatial pattern and its evolution law.Based on LandsatTM/ETM+remote sensing images,the basic data is obtained by using Arcgis and its plug-ins Axowoman,ENVI,OpenStreetMap and other software.This paper analyzes the correlation analysis of spatial connection and urban expansion from 1990 to 2020 in Changsha-Zhuzhou-Xiangtan urban agglomeration from the perspectives of urban accessibility,spatial economic flow intensity and spatial syntactic index.Then by building urban comprehensive strength index system,and based on the way of traffic accessibility to improve the traditional field strength model,2000-2020 urban influence of spatial-temporal pattern evolution law,analysis of changzhutan urban agglomeration of differences,reveals the urban influence spatial structure characteristics and evolution law,and according to the research results and the actual situation of urban development,gives the changzhutan urban agglomeration spatial structure optimization countermeasures.The main research conclusions are as follows:(1)In the first and second phases between 1990 and 2010,the level of urban expansion was relatively moderate,while in the third phase of 2010-2020,it was rapidly improved,and the intensity and speed of urban expansion were significantly higher than before 2010.Urban core of urban accessibility,economic flow intensity and space accessibility can effectively drive the expansion of small and medium-sized cities,but beyond a certain utility threshold,the level of urban expansion and the spatial connection between the core city no longer has a positive correlation,urban agglomeration overall urban expansion level presents the trend of convergence on the spatial network pattern.(2)The average comprehensive strength of the Changsha-Zhuzhou-Xiangtan urban agglomeration is increasing year by year,and the development potential of the urban agglomeration has been effectively stimulated.From 2000 to 2020,the comprehensive strength gap between the older Zhuzhou-Zhuzhou-Xiangtan urban agglomeration narrowed first and then expanded.The spatial pattern of urban strength in Changsha urban area and other cities gradually evolved to Changsha urban area and supplemented by Zhuzhou and Xiangtan urban.The radiation and driving effect of the core area on the weak cities of Chaling County,Yanling County and other cities in the south of the urban agglomeration has not been fully shown.(3)The influence field of urban agglomeration has experienced a transformation process from high-speed enhancement to coordinated development from relying on core regions to drive the development of the whole region to hierarchical and balanced development.From 2000 to 2020,the strong spatial pattern of urban influence field in Zhuzhou-Zhuzhou-Xiangtan urban agglomeration changed from dotted scattered distribution to axial continuous development.By 2020,the overall spatial pattern of older Zhuzhou-Xiangtan urban agglomeration is"h"-type structure,"Changsha City--Xiangtan City--Xiangtan County","Xiangtan City--Zhuzhou City-Liling City" and "Liling City-Youxian" influence field strong axis further enlarged,The field strong correlation between Liuyang City and Changsha County,Zhuzhou City District and Liling City has been strengthened,Ningxiang city,Xiangxiang City and Shaoshan City field strong connection began to take shape,The field strong connection between Ningxiang city and Xiangxiang city is obviously close,And the spatial characteristics of mesh field strong connection began to appear in their own administrative areas,The spatial pattern of three-point influence field in Changsha-Zhuzhou-Xiangtan urban agglomeration has been formed.(4)From 2000 to 2020,the coincidence degree between the influence scope and administrative boundary of senior Zhuzhou-Xiangtan urban agglomeration decreased year by year,the expansion rate of Changsha increased greatly,and the expansion rate of Zhuzhou and Xiangtan decreased.The development situation of "one expansion and two contraction"reflected the improvement of Changsha as the core position of Changsha-Zhuzhou-Xiangtan urban agglomeration.City expansion rate in the east-west direction of "east high west low"distribution trend,Changsha city,Zhuzhou city and Xiangtan city influence is relatively large,in the north-south direction by the north high south low low around the middle,Changsha urban area in the north side are larger,south youxian,chaling,yanling city strength is weak.According to the prediction results,the influence range of the core cities within the Changsha-ZhuzhouXiangtan urban agglomeration is gradually decreasing,while the urban influence range of the surrounding periphery is gradually expanding.(5)The driving role of city scale,financial support and economic strength on the influence of cities is decreasing year by year,and the influence role of innovation and development capacity,information technology level,cultural and tourism soft power and location advantages is being steadily improved.The population base has been at a high driving level during the whole research period. |
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