1994～2015年兰州市不透水面变化分析

Analysis of the Impervious Surface Changes in Lanzhou City from 1994 to 2015

不透水面的监测与变化分析对于城市化进程的了解、城市景观格局的研究以及生态环境的建设等方面具有重要意义。以兰州市建成区为例,基于Landsat遥感影像数据,采用线性光谱分解模型获取了城市不透水面信息,对不透水面的变化进行研究,结果表明,1994~2015年间,兰州市建成区的不透水面发生了较大的变化,但由于发展空间限制,扩张速率和扩张强度呈现下降趋势,在景观格局上分布越来越集中,形状也趋于相对简单化。到2015年,研究区内的不透水面覆盖度达到较高水平,对于兰州城市未来的发展规划提出严峻考验。

In this paper, the impervious surface information of Lanzhou urban built-up area were extracted by linear spectral mixture analysis(LSMA) model based on Landsat image data. And then the spatio-temporal variations of impervious surface were analyzed. The results show that the impervious surface of Lanzhou urban built-up area have changed greatly from 1994 to 2015, but the change rate and change intensity show a downward trend due to available space limitation. The distribution pattern of impervious surface is more and more concentrative, and the shape of impervious surface becomes simpler. It is a grim challenge for the future development planning of Lanzhou City since the impervious surface coverage has reached a higher level by 2015.