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| Titel |
Regional-scale GIS-models for assessment of hazards from glacier lake outbursts: evaluation and application in the Swiss Alps |
| VerfasserIn |
C. Huggel, A. Kääb, W. Haeberli, B. Krummenacher |
| 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 ; 3, no. 6 ; Nr. 3, no. 6, S.647-662 |
| Datensatznummer |
250001320
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| Publikation (Nr.) |
 copernicus.org/nhess-3-647-2003.pdf |
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| Zusammenfassung |
| Debris flows
triggered by glacier lake outbursts have repeatedly caused disasters in
various high-mountain regions of the world. Accelerated change of glacial
and periglacial environments due to atmospheric warming and increased
anthropogenic development in most of these areas raise the need for an
adequate hazard assessment and corresponding modelling. The purpose of
this paper is to pro-vide a modelling approach which takes into account
the current evolution of the glacial environment and satisfies a robust
first-order assessment of hazards from glacier-lake outbursts.
Two topography-based GIS-models simulating debris flows
related to outbursts from glacier lakes are presented and applied for two
lake outburst events in the southern Swiss Alps. The models are based on
information about glacier lakes derived from remote sensing data, and on
digital elevation models (DEM). Hydrological flow routing is used to
simulate the debris flow resulting from the lake outburst. Thereby, a
multiple- and a single-flow-direction approach are applied. Debris-flow
propagation is given in probability-related values indicating the hazard
potential of a certain location. The debris flow runout distance is
calculated on the basis of empirical data on average slope trajectory. The
results show that the multiple-flow-direction approach generally yields a
more detailed propagation. The single-flow-direction approach, however, is
more robust against DEM artifacts and, hence, more suited for process
automation. The model is tested with three differently generated DEMs
(including aero-photogrammetry- and satellite image-derived). Potential
application of the respective DEMs is discussed with a special focus on
satellite-derived DEMs for use in remote high-mountain areas. |
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