Study On The Evolution And Optimization Of Urban Spatial Structure Of The Aba Prefecture Minority Settlements

The regional urban spatial structure is a comprehensive reflection of the urban economy,society and culture.It is the basis for regional economic and social development.The study of the evolution of urban spatial structure in Aba prefecture is of great significance to its economic development,urban construction and cultural continuity.This paper starts from the theoretical basis of regional urban spatial structure,combines theory with practice,analyzes the historical evolution process of urban spatial structure in Aba Prefecture by dividing the time into four phases,and concludes that Aba Prefecture has different spatial structure Characteristics.Then,uses qualitative and quantitative analysis methods,studies the urban spatial structure from of 2000,2005,2010,and 2014.The city’s first degree,order-scale law,fractal dimension calculation,location entropy are used.Researches the evolution process of its hierarchical structure,scale structure,urban spatial layout structure and functional structure,the status and problems of urban spatial structure evolution.Then studies the influencing factors of the dynamic mechanism of urban spatial structure evolution in Aba Prefecture from the aspects of nature,economic development and social development.Finally,based on the analysis of urban spatial structure evolution,the evaluation system of regional urban spatial structure is proposed and constructed.Using the AHP analysis method and efficiency coefficient method.Selects the evaluation system with six indicators including regional economic development level,regional urbanization level,regional urban density,regional highway traffic density,regional urban first degree,and regional urban spatial subdivision.Constructs an evaluation model for the urban spatial structure of Aba Prefecture and make a rationality evaluation and analysis.It also puts forward optimization proposals from the following aspects: enhancing the role of regional centers and towns,coordinating urban construction in Aba Prefecture,enhancing infrastructure construction such as road transportation,and strengthening the inheritance and protection of historical and cultural resources.Finally,the study has the following main conclusions.The historical evolution of the towns in Aba can be divided into several stages: the ancient Shui Kingdom to the Qin and Han Dynasties,from Jin and Sui Dynasties to Tang Dynasties,the Yuan Ming and Qing Dynasties to the Republic of China,from the founding of the People’s Republic of China;the corresponding characteristics of these four stages are as following: the beginning of the administrative division setting,the evolution of the oldlegacy system,the inclusion of the central government layout,the construction of the state domain gradually establishes.Through a qualitative and quantitative approach to study the urban spatial structure in Aba Prefecture,by studying hierarchical structure,scale structure,spatial distribution structure,and functional structure,and concludes that Aba,the study has the following conclusion: The urban spatial structure of Aba prefecture is not the first distribution.The development of towns is mainly along road and rivers,in dotted or linear distribution,forming a spatial layout structure of point-axis development.The urban spatial distribution is relatively balanced,but the urban density is small,the layout is scattered,and the degree of aggregation is low.In the study of the influencing factors of its spatial structure evolution,industry,transportation,and policy factors have greatly promoted the evolution of urban spatial structure.Religious factors had an important impact on the development of cities and towns in history,but in the development of modern urban construction,its influence gradually weakened.Using the quantitative analysis method to study the urban spatial structure of Aba prefecture,the evolution trend of urban spatial structure coordination:uncoordinated,basical uncoordinated,and basical coordinated.At present,it is still at a low level of balanced coordination.In the future,it will gradually evolve toward a highly coordinated.There is still have huge space for development and optimization.