Research On Characteristics Of Urban Expansion And Driving Forces Of Small Cities In Western Sichuan

Urban expansion is a complex economical social phenomena and processes, In recent years, with ever-increasing population, rapid economic development, urbanization process has been speeded up, changing the characteristics of urban expansion increasingly significant and difficult to control the trend appears. Rapid urban expansion in stimulating the urban economy, but also varying degrees of impact on the efficiency of urban land use, but also seriously affect the city's ecological environment. to enhance the study of urban expansion to improve the land utilization efficiency, and improve land management measures to provide scientific and rational sustainable use of land resources, such as countermeasures and suggestions have a positive relevance and strategic importance. Ya'an, Shuangliu and Qionglai basin as the rise of the West is growing small cities. Continued development of the economy, rapid urban expansion, rapid urbanization and urban expansion of the city to stimulate the economic expansion of urban land use will affect the efficiency and effectiveness. Therefore, studying the characteristics of urban expansion and the driving force, which eased the pressure on land for urban construction and planning of scientific and rational management of urban land use plays an important role and significance.Based on the temporal and spatial characteristics of 3 urban expansion, the expansion of the way land-use structure, the expansion of the strength analysis of three different levels of economic development of the small differences in the characteristics of urban expansion. The establishment of the driving force of urban expansion indicators: level of economic development, the value of the tertiary industry accounted for the value of the proportion of tertiary industry, urban scale, the level of urbanization, industrial land, land for public facilities, living space, non-agricultural population, the expropriation of arable land used for urban construction nine factors of land, Analysis of its driving force, drawn mainly affects factor, Conclusions were as follows:(1) 3 years from the 1997-2007 time-space expansion of the characteristics of urban expansion of view, Shuangliu larger expansion of urban land use. 2003-2007, The highest area of built-up area expansion with 6.003Km~2 per year. In large-scale urban expansion In 2007, urban expansion reached the highest coefficient:15.123, 2003-2007, Qionglai Ya'an and the expansion of urban land use of urban traffic Were 1.28 Km~2 per year and 0 Km~2 per year Expansion coefficient of the maximum respectively 3.95 and 2.95, Expansion of the total urban land use is relatively small, a slow period. Judging from the type of urban expansion, Shuangliu County, extensive large-scale expansion, Occupied the outskirts of a large number of arable land, Land-use and less efficient. Ya'an and Qionglai Connotative are extended to transform the old city-based.(2) 1997-2007, Three different urban land use structure, Shuangliu County, the largest urban land use change is the storage space, the municipal land for public facilities, green space, public facilities, land, housing land. Ya'an larger urban land use changes in land use, public facilities, municipal land for public facilities, special sites, storage sites. Qionglai larger urban land use change is the way the square of land, municipal land for public facilities, green, living space. Overall, Changes in three smaller cities in the external transport sites, special land and green space. Various types of land in accordance with national standards. The proportion of land for 20-32%, the proportion of industrial land suitable for 15-25%, the ratio of the road site at 8-15%, the ratio of green space 8-15%, Judging from the overall land-use structure. Shuangliu County has far exceeded the standard. Serious irrational land use structure, more than the standard smaller Ya'an. The internal structure of the use of land-use efficiency, And Qionglai the efficiency of land use structure and relatively reasonable.(3) Three cities in different time and pace of expansion of different intensity. Shuangliu Overall strength and speed of the expansion of the largest, Ya'an the fastest times, the smallest Qionglai.(4) Urban expansion is a dynamic process, rather than the ultimate goal of a static.The impact of urban expansion by many factors, can be attributed to the following aspects: Natural factors, urbanization, city size, economic factors, environmental factors, policies and other factors. Through factor analysis of the impact analysis method, The impact of urban expansion reached the main factors: City size, urbanization level, non-agricultural population, the level of economic development.(5) Based on these research results, In this paper, the relevance of urban expansion on the countermeasures and suggestions for developing a reasonable model of urban expansion, Strictly controlling the size of the population, improving the quality of the population, being strength the planning of urban expansion, and implementation of public participation, Optimizing the layout of urban space and improve the efficiency of urban land use.