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| Titel |
Hazard assessment investigations in connection with the formation of a lake on the tongue of Unterer Grindelwaldgletscher, Bernese Alps, Switzerland |
| VerfasserIn |
M. A. Werder, A. Bauder, M. Funk, H.-R. Keusen |
| 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 (2010-02-11), S.227-237 |
| Datensatznummer |
250007929
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| Publikation (Nr.) |
 copernicus.org/nhess-10-227-2010.pdf |
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| Zusammenfassung |
| The surface of Unterer Grindelwaldgletscher glacier tongue has
subsided by more than 200 m over the last 150 years. The surface
lowering is not uniform over the glacier tongue but depends on the
thickness of the uneven debris cover, which led to the formation of
a depression on the tongue. A lake can form in this basin, which
occurred for the first time in 2005. Such a glacier lake can drain
rapidly leading to a so-called outburst flood. The lake basin has
been increasing in size at an alarming rate and in 2008, it reached
a volume which poses a significant flooding threat to the
communities downstream, as was exemplified by an outburst of the
lake in May 2008. The future evolution of the lake basin was
extrapolated based on surface lowering rates between 2004–2008. An
outburst flood model was tuned with the measured hydrograph from
2008 and then was run with the extrapolated lake bathymetries to
simulate future lake outbursts and estimate their flood hydrographs.
We discuss the rapidly increasing risk for Grindelwald and other
communities, as well as the installation of an early warning system
and possible prevention measures. |
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