Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 8, 1329-1340, 2008
http://www.nat-hazards-earth-syst-sci.net/8/1329/2008/
doi:10.5194/nhess-8-1329-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
04 Dec 2008
Identification of glacier motion and potentially dangerous glacial lakes in the Mt. Everest region/Nepal using spaceborne imagery
T. Bolch1,4, M. F. Buchroithner1, J. Peters1, M. Baessler2, and S. Bajracharya3 1Institut für Kartographie, Technische Universität Dresden, Germany
2Institut für Planetare Geodäsie, Technische Universität Dresden, Germany
3International Centre for Integrated Mountain Development (ICIMOD), Nepal
4Geography Program, University of Northern British Columbia, BC, Canada
Abstract. Failures of glacial lake dams can cause outburst floods and represents a serious hazard. The potential danger of outburst floods depends on various factors like the lake's area and volume, glacier change, morphometry of the glacier and its surrounding moraines and valley, and glacier velocity. Remote sensing offers an efficient tool for displacement calculations and risk assessment of the identification of potentially dangerous glacial lakes (PDGLs) and is especially helpful for remote mountainous areas. Not all important parameters can, however, be obtained using spaceborne imagery. Additional interpretation by an expert is required. ASTER data has a suitable accuracy to calculate surface velocity. Ikonos data offers more detail but requires more effort for rectification. All investigated debris-covered glacier tongues show areas with no or very slow movement rates. From 1962 to 2003 the number and area of glacial lakes increased, dominated by the occurrence and almost linear areal expansion of the moraine-dammed lakes, like the Imja Lake. Although the Imja Lake will probably still grow in the near future, the risk of an outburst flood (GLOF) is considered not higher than for other glacial lakes in the area. Potentially dangerous lakes and areas of lake development are identified. There is a high probability of further lake development at Khumbu Glacier, but a low one at Lhotse Glacier.

Citation: Bolch, T., Buchroithner, M. F., Peters, J., Baessler, M., and Bajracharya, S.: Identification of glacier motion and potentially dangerous glacial lakes in the Mt. Everest region/Nepal using spaceborne imagery, Nat. Hazards Earth Syst. Sci., 8, 1329-1340, doi:10.5194/nhess-8-1329-2008, 2008.
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