Study On The Evolution Mechanism Of Spatial Morphology Of Small Cities In Southern Of Shanxi Basin

Urban spatial form is a concrete reflection of the political,economic,social,cultural and other elements in the process of urban development.It not only represents the level of development of the city,but also reflects the promotion or restriction of various factors on the city in each period.With the rapid improvement of China’s urbanization level,it is particularly important to summarize the characteristics of urban spatial form evolution.Firstly,it analyzes the spatial distribution,population size and economic level of small basin-type cities in southern Shaanxi,and selects three representative small ones from Luonan County of Shangluo City,Hanyin County of Ankang City and Jixian County of Hanzhong City.As the research object,the city sorts out the development process of three typical small cities,and divides its development process into the germination growth period,the initial growth period and the rapid development period.Secondly,quantitative analysis of the spatial morphological evolution characteristics of basin-type typical small cities in southern Shaanxi during the period of rapid development,using ArcGis10.0 from the dominant direction and compactness level of urban external expansion,the changes and replacement of main functional land within the city,Quantitative analysis of urban external and internal spatial patterns.From the perspective of circle distribution,the urban spatial form of Luonan County and Hanyin County presents a “circle + concentric circle” spatial development model,and Jixian presents a “concentric circle” spatial development model.From the overall shape,the southern Shaanxi basin is small.The cities are characterized by the spatial shape of the urban clusters.Finally,it is concluded that the spatial morphological evolution of small cities in southern Shaanxi is formed by the interaction of natural environmental factors,government regulatory factors,economic factors and population factors in the self-organizing mechanism and his organizational mechanism.Self-organizing mechanism from natural environment,science and technology Development and other implicit impetus promote urban development.His organizational mechanism guides and regulates the city scientifically and rationally through urban planning,and externally promotes urban development.The two interact and interweave to shape the urban spatial form.Through the study of the spatial morphological evolution of basin-type small cities in southern Shanxi Province,the spatial morphological characteristics and internal evolution laws are summarized,and the theoretical cities for the study of spatial forms of small cities in the central and western regions are enriched,which is the urban construction and city of basin-type small cities in southern Shaanxi.Planning provides a certain academic support and theoretical reference.