Research On The Optimization Of Spatial Morphology Of Hequ County Town From The Perspective Of Compact City

Located in the northwest of Shanxi Province,Hequ County is one of the typical small cities in the loess hilly and gully region.In recent years,due to the accelerating process of urbanization,a series of problems have appeared in the development and construction of Hequ County Town,such as the disorder of urban boundary expansion,loose spatial structure,and mixed spatial layout.This leads to the increasingly serious land use problem in Hequ County Town,which seriously threatens the healthy and stable development of the city.In addition,due to the fragile local ecological background,serious soil erosion and shortage of land resources,the ecological security of the city has become increasingly serious.In this context,how to alleviate the increasingly prominent contradiction between people and land in Hequ County Town,and build a compact spatial boundary,efficient spatial structure and intensive spatial layout is particularly urgent.From the perspective of compact city and Hequ County Town as the research object,this paper explores the compact development mode of the spatial form of Hequ County Town from the three aspects of the outer form spatial boundary,internal form spatial layout and spatial structure.In the aspect of spatial boundary,in view of the expansion trend of urban spatial boundary,this paper explores the urban growth boundary from the contradiction between urban ecological constraints and expansion demand.Firstly,the concept of ecological security pattern is introduced to delimit the "rigid" boundary,and the analytic hierarchy process and GIS overlay analysis are used to determine the comprehensive ecological security pattern of the city,which is superimposed with the negative factors of spatial development,so as to delimit the rigid growth boundary of the city.Secondly,taking the rigid growth boundary as the ecological constraint,on the basis of selecting the driving factors of urban spatial growth,the future land use of Hequ County Town is simulated by using the FLUS model,and the urban elastic boundary is scientifically and effectively delineated by combining the morphological expansion and corrosion algorithm.Finally,considering the principle of boundary delimitation,the actual situation of the current city,the future development direction of the city and other factors,the compact boundary of the city is delimited.In terms of spatial structure,with the help of spatial syntax model,the paper studies the current spatial structure from the road network system and the central system respectively.It is found that there are problems such as the loose overall structure,imperfect road network system,uneven development among urban areas,and the optimization and adjustment of road network and central system respectively according to the existing problems,And build an efficient and compact spatial structure mode.In terms of spatial layout,the mixed degree,service convenience and distribution density of urban land are analyzed.Study its spatial layout characteristics and existing problems,and problem-oriented spatial layout optimization.To sum up,this paper summarizes the optimization scheme suitable for the compact development of space from three aspects of space boundary,space structure and space layout.The optimized scheme is tested and fed back,and the optimization mode and suggestions are put forward to guide the intensive and compact development of Hequ County Town.This paper uses quantitative analysis method to determine the spatial form of Hequ County Town from the perspective of compact city.It aims to enhance the scientificity and accuracy of the research on the spatial form of Hequ County Town,which has a strong practical value for guiding the future development of Hequ County Town,and also provides a certain reference value for the optimization of urban spatial form in other similar ecologically fragile areas.