Study On Temporal And Spatial Evolution Characteristics And Spatial Optimization Strategy Of Nanchang Metropolitan Region

Metropolitan area is an advanced spatial form in the evolution of urbanization,and an important regional level for the coordinated development of regional space.With the continuous deepening of new urbanization and regional integration strategies,metropolitan areas have become a hotspot in the field of planning research and practice.At present,most of the research objects of urban circles in my country are"developmental"and"mature",but insufficient attention is paid to the"cultivation"metropolitan circles in underdeveloped areas,and there is a problem of regional research imbalance.Therefore,this paper takes the Nanchang metropolitan area in the urban agglomeration in the middle reaches of the Yangtze River as an example to study the spatiotemporal evolution characteristics and spatial optimization strategies of the metropolitan area,in order to promote the development of regional spatial planning theory and provide practical reference for the optimization of the spatial pattern of the metropolitan area.On the basis of sorting out the relevant theories and research progress of the metropolitan area,this paper defines the spatial scope of the metropolitan area according to the idea of"diachronic evolution analysis-current tense pattern identification-future state space optimization",from the three aspects of population,economy and urban and rural construction space On the one hand,it studies the temporal and spatial evolution characteristics of the metropolitan area,measures and identifies the characteristics of the territorial spatial pattern of the metropolitan area,reflects on its key issues,and proposes an optimization strategy for the territorial spatial pattern of the metropolitan area.The main contents of the paper include:The first part is the definition of the spatial scope of Nanchang metropolitan area.Comprehensively considering the experience in the delineation of metropolitan area spatial scope and the actual situation of Nanchang urban area,based on the theory of“space of place”and“space of flow”,with the method of quantitative measurement and qualitative correction,integrating geospatial data,economic and social data and Internet data,with the help of Arc GIS 10.3,from the three aspects of economic connection,network attention and1-hour commuting circle,the initial identification range of the vector is constructed,and then the qualitative correction is made to define the area of Nanchang metropolitan area as27,700 km~2,including 24 county-level units,and It is divided into three space circle layers:core,middle and outer.The second part,the spatiotemporal evolution characteristics of Nanchang metropolitan area.From the dimensions of"population-economy-space",using the economic and social data and spatial data of 2000,2010 and 2020,the analysis shows that the Nanchang metropolitan area is mainly in the extensional expansion,taking into account the cultivation and development stage of connotative growth,and further summarizes the characteristics of the temporal and spatial evolution of the cultivating metropolitan area:in the development stage,from the metropolitan area to the metropolitan area;in the population evolution,from the centripetal agglomeration to the near-regional diffusion and continuous distribution;in the industrial evolution,From traditional industry and agriculture to modern industrial clusters;in terms of spatial evolution,from scattered points to central agglomeration and then to the point axis gradually.The third part,the characteristics of the spatial pattern of the Nanchang metropolitan area.From the two aspects of land space development and protection pattern,the place form of the metropolitan area is studied,and eight typical spatial elements are selected to construct an analysis framework of"spatial elements-Boolean operation-element merger".Based on the technical methods of mathematical statistics and spatial analysis,the spatial Data and statistical data,measure and identify each spatial element.On the basis of empirical analysis,it is extracted that the territorial spatial development pattern of the nurturing metropolitan area presents the characteristics of central polarization,corridor extension,and circle differentiation,and the protection pattern presents the characteristics of pastoral base,ecological fan,and unique charm.The fourth part is the optimization mode and strategy of the overall spatial pattern of the Nanchang metropolitan area.Aiming at the key issues and reflections on the development of the land space in the metropolitan area,based on the optimization goal of"compact,multi-core and elastic"(CMR),borrowing the theory of point-axis development,and adopting the spatial organization method of"core+axis+group+fan",Construct a"strong core,point and axis"model of territorial spatial pattern optimization,and propose three high-quality development spaces,including creating an intensive and efficient development space pattern,building a resilient and safe protection space pattern,and jointly building an urbanization and cross-border cooperation zone.To sum up,the thesis innovatively proposes a method for defining the spatial scope of metropolitan areas based on"place-flow",and constructs a"strong core point axis"nurturing metropolitan area spatial optimization model.The research results will help enrich the development of urban and regional spatial theory,and guide the practice of territorial spatial planning in metropolitan areas.