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Climate change and rock fall events in high mountain areas : numerous and extensive rock falls in 2007 at Mittlerer Burgstall, Central Austria

Concepts and implications of environmental change and human impact : studies from Austrian geomorphological research

Auteur(s) et Affiliation(s)

Dep. of Geography and Regional Science, Univ., Graz, Autriche
Inst. of Remote Sensing and Photogrammetry, Univ. of Technology, Graz, Autriche
LIEB, G.K.
Dep. of Geography and Regional Science, Univ., Graz, Autriche
AVIAN, M.
Inst. of Remote Sensing and Photogrammetry, Univ. of Technology, Graz, Autriche
CARRIVICK, J.
School of Geography, Univ., Leeds, Royaume-Uni
KEILER, M.
Inst. of Geography, Univ., Bern, Suisse
Dep. of Geography and Regional Science, Univ., Graz, Autriche
Inst. of Remote Sensing and Photogrammetry, Univ. of Technology, Graz, Autriche
OTTO, J.-C.
Dep. of Geography and Geology, Univ., Salzburg, Autriche


Description :
In 2007, a number of rock fall events occurred on the sharp SE-ridge of the mountain Mittlerer Burgstall completely changing the shape of the mountain. In this paper the AA. use geomorphological mapping, permafrost distribution modelling, glacier reconstruction, surface and near-surface ground temperature data, air temperature data, and airborne laserscanning data to assess these multiple rock fall events. Permafrost modelling and ground temperature monitoring indicate that the area of detachment is located near the lower limit of discontinuous permafrost. Substantial surface lowering of the glacier tongues surrounding the mountain on both sides (by −250 and −70 m since the Little Ice Age) changed the stress and strain field in the bedrock. Furthermore, the generally highly fractured bedrock favoured slope instability. The triggering event for the rock falls were most likely the effects of the warm winter of 2006/07. A monitoring programme regarding future rock falls at Mittlerer Burgstall is ongoing.


Type de document :
Article de monographie

Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2012, vol. 94, n°. 1, p. 59-78, nombre de pages : 20, Références bibliographiques : 2 p.

Date :
2012

Editeur :
Pays édition : Suede, Stockholm, Svenska sällskapet för antropologi och geografi

Langue :
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)