摘要
由于全球变暖,冰川正逐年退缩,随之引发的冰湖溃决洪水已不容忽视,但静态和孤立地研究冰湖已不能满足人们对冰湖信息的需求,本文基于20世纪70年代的地形图数据和2000年以来的ASTER遥感影像数据,使用GIS手段矢量化朋曲流域20世纪70年代和近期的冰川及冰湖的空间分布,并进行编目。对于获得的空间数据分析结果表明,在过去30年里该区冰川面积减少近9％,冰湖面积则增加了13％,在此基础上比较二者的联系和变化,识别出了24个可能发生溃决的冰湖,这为朋曲流域建立一套冰湖溃决预警系统提供依据;同时,对于研究其他类似地区的冰湖溃决现象也具有指导意义。
The glaciers are retreating year after year because of the global warming. As a result, the glacial lake outburst floods (GLOF) become frequent. So that more attention should be paid on them. But the study of glacial lakes with static and isolated means has not satisfied the need to monitor the glacial lake change. The basic data in this paper includes relief maps in 1970s and aster images in 2001 and 2002. The GIS tools are used to digitizing the spatial distribution of the glaciers and glacial lakes during these two periods. Then these spatial data are analyzed. The results show that the glacier area decreases 9% and the glacial lake area increase 13%. Then 24 potential risk lakes are identified in Pumqu Basin. The results are very important to monitore the GLOF and constructing an effective pre-alarm system of the GLOF hazards.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第2期97-100,共4页
Journal of Lanzhou University(Natural Sciences)
基金
中国科学院知识创新工程重大资助项目(KZCX2-308-3-7)
