| Ziyang County is located in the upper reaches of Hanjiang River Basin and the hinterland of Qinba mountainous area with fragile ecological environment.Due to the "three mountains and two rivers" landscape,it presents a typical river valley belt-shaped city.In recent years,with the urbanization process of Ziyang County,under the development background of strong natural landscape constraints and construction land shortage,has seen the expansion of spatial boundaries,breakthroughs in landscape constraints,spatial structure imbalances,and other urgent problems.In the future,how to coordinate the relationship between urban spatial development and landscape environment,delimit ecological boundaries,anchor the ecological base,control urban development boundaries,and maintain the landscape environment;integrate landscape patterns,construct urban functional structures,conform to landscape context,and build efficient and convenient transportation networks,combined with the landscape and environment,the organic and coordinated land layout is particularly important for the sustainable development of Ziyang urban space.From the perspective of the influence of natural landscapes on urban Spatial form,this paper choose Ziyang County as the research object,mainly including three parts.The first part is the research basis,including research background,research purpose and significance,research object and concept definition,as well as domestic and foreign research review.The second part is the analysis of spatial features and problems under the influence of natural landscape.First of all,on the basis of combing the basic situation of Ziyang County,analyze the landscape environment of Ziyang County from landscape environmental basis and landscape environmental features.Secondly,through qualitative research on the evolution of urban spatial form and natural landscape,the county’s spatial form is deconstructed into three systems of space boundary,spatial structure,and land use layout,and the spatial form characteristics of the county adapted to natural landscape and nature are analyzed quantitatively.The spatial form problem under the constraints of landscape.The third part is focuses on the optimization and promotion of the spatial form problem under the constraints of natural landscape,including three parts: the delimitation of the space boundary,the organization of the spatial structure and the adjustment of the land layout.In terms of spatial boundary delineation,on the basis of spatial boundary expansion research and judgment,from the perspective of non-construction land and construction land,the ecological sensitivity and construction land suitability evaluation model is used to delimit the boundary of the county.Starting from the motivation,the traffic expansion rate model is introduced to find the scope of urban expansion,and simulations of different expansion methods are carried out to find the staged county development boundaries that are conducive to the maintenance of landscapes and waters.In terms of spatial structure and organization,in the foundation of the analysis of the influencing factors of the functional structure,the functional composition and functional positioning of the county are determined,and two functional structures of "two nuclei,coexistence and development of new and old cities" and "multi-center coordination,compact group growth" are proposed.Imagine choosing the best,choosing the structure of "multi-hearted coordination,compact group growth",and constructing a functional structure from three aspects: partitioning,core shaping,and axis.Then,the road network structure of Ziyang County was organized from two aspects: the road network of vehicles and the slow walking trails.Regarding the adjustment of land use layout,build a land use layout system based on the classification of Sansheng land use,and divide the land use elements into ecological land elements,living land elements,and production land elements.Aiming at the issue of ecological land layout,using the theory of "spot-corridor-base",the strategies of "layered utilization of mountain substrates","building ecological corridors of mountains and rivers",and "repairing ecological patches of green land" are proposed to adjust the ecological land layout.In response to the problem of the layout of living and production land,the strategies of "according to the situation,dividing livable communities","gathering and dispersing,balancing public services",and "adjusting the commercial layout along the riverside" are proposed.Finally,the various systems are superimposed and adjusted to form the spatial form of Ziyang County under the influence of natural landscape.In this paper,the impact of natural landscape on urban spatial form is taken as the perspective,this paper aims to explore the spatial form of Ziyang County adapted to the natural landscape through spatial boundary delineation,spatial structure organization,and adjustment of land use.Provide reference for the development of the same type of valley-type cities on a larger scale. |
