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| Titel |
A multi-level strategy for anticipating future glacier lake formation and associated hazard potentials |
| VerfasserIn |
H. Frey, W. Haeberli, A. Linsbauer, C. Huggel, F. Paul |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 2 ; Nr. 10, no. 2 (2010-02-22), S.339-352 |
| Datensatznummer |
250007938
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| Publikation (Nr.) |
 copernicus.org/nhess-10-339-2010.pdf |
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| Zusammenfassung |
| In the course of glacier retreat, new glacier lakes can develop. As such
lakes can be a source of natural hazards, strategies for predicting future
glacier lake formation are important for an early planning of safety
measures. In this article, a multi-level strategy for the identification of
overdeepened parts of the glacier beds and, hence, sites with potential
future lake formation, is presented. At the first two of the four levels of
this strategy, glacier bed overdeepenings are estimated qualitatively and
over large regions based on a digital elevation model (DEM) and digital
glacier outlines. On level 3, more detailed and laborious models are applied
for modeling the glacier bed topography over smaller regions; and on level 4,
special situations must be investigated in-situ with detailed measurements
such as geophysical soundings. The approaches of the strategy are validated
using historical data from Trift Glacier, where a lake formed over the past
decade. Scenarios of future glacier lakes are shown for the two test regions
Aletsch and Bernina in the Swiss Alps. In the Bernina region, potential
future lake outbursts are modeled, using a GIS-based hydrological flow
routing model. As shown by a corresponding test, the ASTER GDEM and the SRTM
DEM are both suitable to be used within the proposed strategy. Application of
this strategy in other mountain regions of the world is therefore possible as
well. |
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