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| Titel |
On the influence of topographic, geological and cryospheric factors on rock avalanches and rockfalls in high-mountain areas |
| VerfasserIn |
L. Fischer, R. S. Purves, C. Huggel, J. Noetzli, W. Haeberli |
| 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 ; 12, no. 1 ; Nr. 12, no. 1 (2012-01-31), S.241-254 |
| Datensatznummer |
250010420
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| Publikation (Nr.) |
 copernicus.org/nhess-12-241-2012.pdf |
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| Zusammenfassung |
| The ongoing debate about the effects of changes in the high-mountain cryosphere
on rockfalls and rock avalanches suggests a need for more knowledge about
characteristics and distribution of recent rock-slope instabilities. This
paper investigates 56 sites with slope failures between 1900 and 2007 in the
central European Alps with respect to their geological and topographical
settings and zones of possible permafrost degradation and glacial
recession. Analyses of the temporal distribution show an increase in
frequency within the last decades. A large proportion of the slope failures
(60%) originated from a relatively small area above 3000 m a.s.l. (i.e.
10% of the entire investigation area). This increased proportion of
detachment zones above 3000 m a.s.l. is postulated to be a result of a
combination of factors, namely a larger proportion of high slope angles,
high periglacial weathering due to recent glacier retreat (almost half of
the slope failures having occurred in areas with recent deglaciation), and
widespread permafrost occurrence. The lithological setting appears to
influence volume rather than frequency of a slope failure. However, our
analyses show that not only the changes in cryosphere, but also other
factors which remain constant over long periods play an important role in
slope failures. |
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