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Variation of the Glaciers in Nyingchi Municipality of Tibet Autonomous Region during 1990—2000

ZHANG Ting-bin1,2,ZHANG Jian-ping3,WU Hua4,BIE Xiao-juan2,WANG Gao-feng5(1.School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;2.College of Earth Sciences, Chengdu University of Technology,Chengdu Sichuan 610059,China;3.Department of Land and Resources of Tibet,Lhasa Tibet 850000,China;4.Tibet Institute of Geological Survey,Lhasa Tibet 850000,China; 5.State Key Lab.of Geo-hazard Prevention and Geo-Environment Protection,Chengdu University of Technology,Chengdu Sichuan 610059,China)  
Based on remote sensing and geographical information systems techniques,using multi-periods of Landsat image and Digital Elevation Model,the glaciers of Nyingchi Municipality in Tibet Autonomous Region are mapped and the variation of glaciers during 1990—2000 are studied in this paper.Result shows that glacierized area decreased about 568.71 km2,with an average retreat rate of 56.87 km2·a-1 from 1990 to 2000.Studying the representative glaciers shows that some glaciers were increasing and some were decreasing,with the principal tendency of retreating.Studying the variation of representative glaciers' terminus indicates that glaciers terminus shrunk about 172.65 m during 1990—2000,with an average retreating rate of 17.27 m·a-1.
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