| Huanglang Ancient Town in Leibo County has a long history of 2137 years,which has profound cultural deposits,a beautiful environment and has the reputation of "plateau wetland water town".The development and evolution of the space form shows different characteristics in the development stage,which in turn affects the sustainable development of tourism.In order to promote the sustainable development of ancient town tourism,it is urgent to adjust the functional space to solve the problems caused by historical changes and blind construction of ancient town residents in the early stage of tourism development including spatial dysfunction,road grid confusion,wetland ecological damage and destruction of historic sites.In this paper,remote sensing images of ancient towns in the past 25 years from 1993 to2017 were selected and their space morphological evolution was studied.This paper provides a theoretical basis for the spatial adjustment of tourism sustainable development of Huanglang ancient towns by analyzing the evolution characteristics and the influencing factors of the space form of the ancient town.Firstly,this paper systemly reviews the relevant research results of historical ancient towns on the spatial form,the sustainable development about ancient towns and Huanglang Ancient Town.And we not only card the related theory,but also define the concepts of the wetland town,town space form and tourism characteristic town by analyzing its natural ley and historical context,clarifying the development of a series of problems.Secondly,the spatial morphological change of Huanglang ancient town was analyzed and evaluated by ENVI,GIS and other technical means.On the basis of data processing,the space analysis methods such as area dynamic change,common edge measure,centred offset and quadrant bearing analysis are used to measure and drive factor analysis from the three levels of ancient town land expansion rate,expansion mode and expansion direction.The results show that the expansion rate of the ancient town has the characteristics of stages and goes through a slow,rapid and medium-speed expansion process.the ancient town expansion modes mainly includeedge,filling and scatter,and different expansion modes have their own spatial distribution characteristics.At the same time as the general direction of the ancient town's space development shifted,the intensity and speed of expansion varied from period to period.The overall spatial direction mainly centered on the expansion of wetland water systems and traffic roads.Furthermore,Using SPSS analysis tools to analyze the driving factors of ancient town spatial evolution.The principal component analysis method is used to determine that the spatial evolution of ancient towns is caused by multiple factors such as economic factors,demographic factors,policy guidance and natural factors.The results show that the economic and policy orientation is the internal driving force of the spatial expansion of ancient towns,the improvement of tourism infrastructure and supporting service facilities is the external thrust of the spatial expansion of ancient town,and the spatial morphological evolution of ancient towns is the result of the comprehensive effect of multiple driving forces.Finally,based on the above analysis results and the existing problems of ancient town,this paper proposes the spatial development direction and the concept of sustainable development about Huanglang Ancient Town in the future by combining the functional space adjustment,the reconstruction of historical cultural memory and regional connection strengthening,so as to provide decision-making basis for the planning and construction development of Huanglang Ancient Town. |
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