| This paper is a sub-project under the project of National Natural Science Foundation of China("No.51578454"),which is based on the theory of complex system theory and the ecological optimization mechanism of urban spatial structure in Sichuan Tibetan area.At present,China is in the transition period of urbanization,and the study of ecological optimization of urban spatial structure is the hotspot under the background of highlighting urban and rural ecological and environmental problems.As an important part of the national key ecological function area,the Sichuan Tibetan area requires the development of cities and towns to take the road of ecological and sustainable development.However,the towns in the region are strongly constrained by the ecological environment due to their special physical and geographical characteristics.Valley-type cities and towns in Sichuan as the largest proportion of Tibetan urban type,subject to the constraints of natural elements more strongly.Further exploring the interaction mechanism between the spatial structure and the natural elements of the valley-type cities in the Tibetan areas of Sichuan,is helpful to put forward the optimization strategy which suits the ecological development of the urban spatial structure in the region.Based on the characteristics of the spatial structure of the valley-type cities and towns in the Tibetan areas of Sichuan,this paper studies the main natural restraints in the process of spatial structure development of such cities and towns,and analyzes the convergent points of the contradictions.And finally form the ideal spatial structure model,and put forward the optimization advice.The paper is divided into the following six chapters:Chapter 1:Introduce the research background,purpose and significance of this paper,determine the object and content of the study,introduce the research methods and the overall thinking,framework.Chapter 2:Defines the core concept of this paper,determines the scope of the study,and summarizes the relevant research on the core concepts.Chapter 3:Explain the significance of the research on the valley-type towns in the Tibetan areas of Sichuan Province,delineate the built-up areas of each valley-type town,and classify the grades and morphological structures of all valleys and towns.And put forward the general rule of the spatial structure evolution of valley town in Sichuan province.Chapter 4:Select the geological,terrain,hydrology and climate as the main natural elements influencing the spatial structure development of the valley town in Sichuan Tibetan area.And then select the core factors from each factor to carry out the analysis of the impact mechanism.Form the framework of restricting the development of urban spatial structure,and put forward the core problems encountered in the process of urban development.Chapter 5:Proposing targeted optimization ideas and measures in conjunction with core issues.Chapter 6:Summarize the main conclusions of this paper,put forward the innovation and shortcomings of this paper. |
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