 |
| Titel |
Identification of glacier motion and potentially dangerous glacial lakes in the Mt. Everest region/Nepal using spaceborne imagery |
| VerfasserIn |
T. Bolch, M. F. Buchroithner  , J. Peters, M. Baessler, S. Bajracharya |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 6 ; Nr. 8, no. 6 (2008-12-04), S.1329-1340 |
| Datensatznummer |
250005904
|
| Publikation (Nr.) |
 copernicus.org/nhess-8-1329-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|