Study On The Border Expansion Of Towns At County Level

With the disorderly development and construction of urban land in China,the surrounding cultivated land area has declined,land use is not intensive,and the ecological environment has been increasingly damaged.The urban expansion boundary is one of the means for the state to control urban land construction.Expansion boundary research has important theoretical significance and practical value for the rational expansion of urban construction.This paper first proposes a logical framework for the prediction of the expansion boundary of the town of Sishui County.Through the historical land evolution of Sishui County,the mathematical expansion and spatial analysis methods are used to obtain the spatial expansion rate and shape,the type of influencing factors,and the land problems that have erupted during the historical evolution of Sishui County Then use scenario simulation,remote sensing(RS),geographic information system(GIS)technology combined with geographic information optimization system(GeoSOS-FULS)software to delineate the expansion boundary of Sishui county town in 2029 based on the transformable land boundary of the town;finally Demonstrate the achievements of urban expansion boundary demarcation and put forward urban expansion boundary adjustment strategies and space management suggestions.The main research contents and results are as follows:(1)Analyze the practical dilemma of the demarcation of urban expansion boundaries in China,demonstrate the logical relationship between urban spatial expansion and urban expansion boundaries in the study area,and study the scientific research methods of the possibility of urban expansion in the future.The logical framework of the expansion boundary demarcation;(2)Summarize the natural,geographical,socio-economic,population size and land use status of Sishui County,through spatial analysis and mathematical methods to study the historical evolution of spatial expansion,land type structure evolution,expansion speed,expansion intensity,expansion elasticity coefficient of Sishui County after 2000,The compactness of cities and towns,and the evolution of the center of gravity of urban spaces,and the phased summary of spatial expansion and the factors influencing the spatial expansion are obtained.At the same time,the problems existing in the historical spatial expansion of Sishui county are summarized;(3)Three scenarios models of infill,grouping,and extension are established through the inductive calculation method of the key factors of the development of Sishui county,and the spatial performance and correlation characteristics of the three scenario models are analyzed,and then based on the land and space planning The factors used in the evaluation use the ecological suitability analysis method to set the transformable land boundary of Sishui County.Finally,based on the transformable land boundary of Sishui County,the scenario model,geographic information system(GIS),remote sensing(RS)technology and geographic information optimization are used.The model(GeoSOS-FLUS)software is combined to carry out the simulation and delimitation of the expansion boundary of the town of Sishui County in 2029;(4)Use kappa coefficient and overall precision to quantitatively check the accuracy of urban expansion boundary.Through the development policy of Sishui County and the overall urban planning,we will demonstrate the text of the expansion boundary of urban expansion in Sishui County in 2029,and finally adjust the trigger mechanism for the expansion boundary of urban expansion in Sishui County.Guidance strategies inside and outside the boundary,and space growth management strategies.