Study On Urban Scale Distribution And Spatial Form In Lanxi Area

The "13th Five-Year" plan,to speed up the construction of city agglomeration,urban layout and shape optimization,enhance the radiation effect of the central city.Lanxi area is one of the most densely populated areas in the northwest of China.Based on the superior location and resource advantages,the level of urbanization has been improved.It is of great significance for the development of the regional city to be reasonable or not.Because of the special natural geographical environment and multi ethnic settlement,the size distribution and spatial form of the city are different from those in the eastern part of china.In this paper,the western region as the research object,first of all,through the regional urban development process and the current situation of the spatial distribution pattern,the development of the context of the inter city in the west region has a global understanding.Then the classification of the city spatial form by using the method of typology,drawn from the valley city space form in the banded Lanxi area is the most typical,and in Lanzhou,Xining city two core analysis on the characteristics of the valley city space form.Secondly,to explore the interaction between the natural environment conditions and the multi-ethnic settlement form.Altitude and river system of human settlements,city distribution,spatial form evolution has important role in Lanxi area;a large number of ethnic minorities along the Huangshui River Basin in poly showed zonal distribution scattered,small communities,city spatial morphology influenced by religious culture outstanding performance is "living around the temple" "around the temple and the special form of business".Through the analysis and summary of the natural geographical environment,the urban population distribution and spatial form evolution in the west area of the city of Shaanxi Province have obvious guiding role.In the part of quantitative analysis,using the first degree index,Zipf's law and fractal dimension,the paper analyzes the current situation and evolution process of the urban population size distribution in Lanxi city.City population scale status scale structure of continuous,large and medium scale city distribution is relatively dispersed,a large number of small city,Lanzhou City,the first characteristic is obvious,but the leading role in the development of regional urban system has been lacking.From 2004-2014 Lanxi area city size distribution evolution process,there have been differences between city population size sequence,but gradually optimized,of which the first city of Lanzhou city population gradually narrowing the gap between the small and medium-sized city,growing status.The correlation dimension of fractal dimension in the city of Lanzhou Xining area distribution pattern of quantitative analysis,on the above qualitative analysis in Lanxi area city along the river Huang Valley verified distribution.The city expansion intensity index,speed,fractal dimension,land expansion of city construction and city compactness index expansion elasticity coefficient of typical city space form study,found nearly 30 years in Xining city spatial expansion characteristics consistent with the characteristics of city spatial form evolution of valley,at the present stage of city spatial expansion waste.Finally,on the macro level,this paper puts forward some suggestions on the reasonable distribution of the urban scale in the west of the city,and puts forward the optimization strategy of the micro level facing the typical Valley city spatial form evolution.