临沧市临翔区城市形态演变的分形研究

在对临沧市临翔区1949～2009年城市建成区地图进行遥感和GIS技术处理的基础上,利用分形理论的边界维数模型对其城市形态的演变过程进行了定量分析,并以城市紧凑度和建成区面积年均增长率作为辅助数据,探索了临翔区城市形态在不同历史阶段的扩展特征。研究表明:临翔区城市形态具有分形特征,其演变过程经历了5个大的阶段:第一次快速扩展期、缓慢扩展期、恢复扩展期、第二次快速扩展期和稳定扩展期。扩展模式在外部扩展和内部填充之间不断"角力"。在整体的扩展方向上,以向北为主导。演变受到多种因素的共同作用,以经济、政策和自然因素的影响为最大。

THE FRACTAL STUDY ON URBAN MORPHOLOGY EVOLUTION OF LINXIANG DISTRICT IN LINCANG CITY

Basing on the urban built-up area extension maps from 1949 to 2009 of Linxiang District in Lincang City which were generated from RS and GIS technology,using boundary dimension model of fractal theory,quantitative analysis had been conducted to research the urban morphology evolution,additionally made city compactness and average annual growth rate of urban built-up region area to be auxiliary data,then the morphology expansion process and the character in different history times were explored.Study indicated that Linxiang District urban morphology bore clear fractal characteristics;there were five big stages in the evolution of urban morphology： the first quicker extension period,slower extension period,restored extension period,the second quicker extension period and stable extension period.The extended mode of urban morphology was transformed between external extension and internal padding.On the overall extension direction,north were dominant.The evolution was affected by many factors,and the effects of economy,policy and nature were bigger than others＇ in these factors.