Research On Delimitation Of The Urban Development Boundary In Xi’an Under The Spatial Planning System Of China

The territorial and spatial planning system is a systematic project that requires a series of institutional and technological innovations,including the delineation of "three lines of control" such as the development boundary of cities,counties,and towns.The General Office of the State Council issued guidelines on the governance of the territorial and spatial planning system in 2019,in which development boundaries it clearly stated that reasonable analysis and estimation of urban should be carried out,and corresponding principles for the delineation of urban development boundaries were also proposed.instructions.The State Council clearly pointed out that in the process of delimiting urban development boundaries,the corresponding urban capacity should be limited from multiple perspectives such as population economy and urban development.At the same time,a certain percentage of blank areas should be set aside during the development process to provide a better future.Changes and economic improvement provide a certain foundation.This research is based on the municipal-level land and space master planning system,taking Xi’an as the research object,and discussing the practical research on the delimitation of urban development boundaries in Xi’an from the two dimensions of scale quantitative and spatial shape.In terms of boundary scale: frame the maximum scale,clarify the minimum boundary,predict a reasonable scale,and reserve flexible development;in terms of boundary shape: preset multiple scenarios,dynamically simulate the direction of space expansion,and finally form a reasonable scale,scientific layout,and flexible development.Effective management and control of the urban development boundary of Xi’an.It is concluded from the existing research literature that the current process of considering urban development boundaries requires analysis from three perspectives.The first is to take external constraints as the bottom line of development.First,analyze the spatial positioning of ecological land,and then analyze the urban area.Corresponding derivation and summary of relevant indicators of development land.The second is to take the urban internal expansion demand as a driving factor,and consider various influencing factors on the basis of the city itself.The third is to integrate the two elements of restraint and expansion to ensure that they can play a better role in the process of boundary delineation.In the development process of land and space planning,the quality of development should be continuously improved with a quantitative positioning model.This study is based on the land use data of Xi’an for the ten years from 2009 to 2019(the third adjustment and the second adjustment annual change data),and summarizes the urban spatial change characteristics of Xi’an from three aspects: land use scale,spatial layout,and spatial form;through ecological Protection importance evaluation and ecological security pattern research,sort out the ecological space system structure of Xi’an,and form three ecological security management and control patterns of high,medium and low,as the bottom line of ecological constraints for urban development in Xi ’ an;selection covers natural geography,transportation location,A total of twelve evaluation factors in the three major social and economic categories are used as the driving force for urban space expansion.Through gray correlation analysis,the influence weights of various driving factors in the past urban development are determined,and the urban space expansion model based on CA-Markov is constructed.,Proposed four development scenarios of edge expansion,peripheral growth,corridor carrying,and industry dominance,and summarized and analyzed the simulation results from two aspects of expansion direction and expansion area;based on the evaluation of resource and environmental carrying capacity and population scale prediction,the future of Xi’an was estimated The scale of urban space land use in China,and proposed three growth scales: high,medium and low;finally,from the two-way conditions of restraint and growth,the two dimensions of spatial shape and scale,delineate concentrated construction areas,flexible development areas,and special purpose areas,and Propose relevant control measures inside and outside the boundary.