改革开放以来芜湖市城市空间扩展及驱动力分析

以landsat MSS/TM/ETM+遥感影像为数据源,借助Arc GIS平台,选取城市空间扩展速度、扩展强度、紧凑度、分形维数、重心坐标、扩展弹性系数等指标,运用空间形态分析、叠加分析、等扇分析等方法,分析了改革开放以来芜湖市城市空间扩展时空特征,结合统计数据探究了扩展驱动力。结果表明:1979-2012年间,芜湖市城市空间扩展速度与强度具有较大波动性;人口增长与城市空间扩展的关系渐趋合理;城市空间形态由紧凑型向分散型转变;城市空间沿长江及主要交通线非均衡拓展;城市重心东偏北移;经济、人口、交通建设等是芜湖市空间扩展的主要驱动力。

ANALYSIS ON URBAN SPATIAL EXPANSION AND ITS DRIVING FORCES IN WUHU SINCE REFORM AND OPENING UP

With the rapid development of social economy in China since the reform and opening up, the process of urbanization is speeded up. Urban spatial expansion is one of the notable features of urbanization, analysis of urban spatial expansion have a great benefits to predict, guide and regulate the future development of the city, analyze and settle the problems in the city's social and economic development. This paper takes Wuhu City as an example, which is located in the southeast of Anhui province, Central China. There has been a rapid development in its urbanization and obvious changes in the urban spatial expansion since the reform and opening up. To reveal the dynamics of urban spatial expansion, Landsat MSS/TM/ETM+ remote sensing images in different period were used as data resource, with the help of RS and ArcGIS software platform, the spatial expansion information of Wuhu City was extracted by man-machine interactive method from multi-temporal satellite. Then select some indexes such as speed of urban spatial expansion, expansion intensity, compact ratio, fractal dimension, center coordinates and elasticity coefficient and use some different research methods, for instance spatial form analysis, overlay analysis, fans analysis, the temporal and spatial expansion characteristics of Wuhu City as well as their driving forces were systematic analyzed. The result shows that during the period from 1979 to 2012, the overall pattern of urban spatial form of Wuhu City is from compact and stable change into loose and unstable.