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| Titel |
Impacts of anthropogenic and environmental factors on the occurrence of shallow landslides in an alpine catchment (Urseren Valley, Switzerland) |
| VerfasserIn |
K. Meusburger, C. Alewell |
| 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 ; 8, no. 3 ; Nr. 8, no. 3 (2008-05-19), S.509-520 |
| Datensatznummer |
250005529
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| Publikation (Nr.) |
 copernicus.org/nhess-8-509-2008.pdf |
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| Zusammenfassung |
| Changes in climate and land use pose a risk to stability of alpine soils,
but the direction and magnitude of the impact is still discussed
controversially with respect to the various alpine regions. In this study,
we explicitly consider the influence of dynamic human-induced changes on the
occurrence of landslides in addition to natural factors. Our hypothesis was
that if changes in land use and climate have a significant influence on the
occurrence of landslides we would see a trend in the incidence of landslides
over time. We chose the Urseren Valley in the Central Swiss Alps as
investigation site because the valley is dramatically affected by landslides
and the land use history is well documented. Maps of several environmental
factors were used to analyse the spatial landslide pattern. In order to
explain the causation of the temporal variation, time-series (45 years) of
precipitation characteristics, cattle stocking and pasture maps were
compared to a series of seven landslide investigation maps between 1959 and
2004. We found that the area affected by landslides increased by 92% from
1959 to 2004. Even though catchment characteristics like geology and slope
largely explain the spatial variation in landslide susceptibility (68%),
this cannot explain the temporal trend in landslide activity. The increase
in stocking numbers and the increased intensity of torrential rain events
had most likely an influence on landslide incidence. In addition, our data
and interviews with farmers pointed to the importance of management
practice. |
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