Permafrost and destabilization of alpine rockwalls: a very close link in the Mont Blanc massif
International audience The number of rockfalls actually seems to rise in the Alps, while vulnerabilities are increasing in high altitude and in valleys. Due to a lack of systematic observations, frequency and magnitude of rockfalls, as well as their triggering factors remain poorly understood. We he...
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ftunivsavoie:oai:HAL:halsde-00873382v1 2024-04-28T08:35:32+00:00 Permafrost and destabilization of alpine rockwalls: a very close link in the Mont Blanc massif Ravanel, Ludovic Deline, Philip Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Rome, Italy 2011 https://hal.science/halsde-00873382 en eng HAL CCSD halsde-00873382 https://hal.science/halsde-00873382 Proceedings of the 2nd World landslide Forum, Rome 2nd World landslide Forum https://hal.science/halsde-00873382 2nd World landslide Forum, 2011, Rome, Italy. pp. 397-402 info:eu-repo/semantics/conferenceObject Conference papers 2011 ftunivsavoie 2024-04-11T00:12:29Z International audience The number of rockfalls actually seems to rise in the Alps, while vulnerabilities are increasing in high altitude and in valleys. Due to a lack of systematic observations, frequency and magnitude of rockfalls, as well as their triggering factors remain poorly understood. We here analyse different inventories of rockfalls acquired in the whole Mont Blanc massif by three innovative methods in order to emphasize the role of permafrost. Permafrost degradation appears to be the most likely triggering factor. In particular, almost all of the recorded rockfalls occurred in a context of permafrost, a very good correlation exists between climate (temperatures) and rockfalls, the other temperature-dependent factors may only explain a little part of the rockfalls, and topographic factors are highlighting the importance of permafrost in rockfall trigger. Within the context of global warming scenarios for the twenty-first century, these results raise the question of risk assessment and management in high mountain regions. Conference Object permafrost Université Savoie Mont Blanc: HAL |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
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ftunivsavoie |
language |
English |
description |
International audience The number of rockfalls actually seems to rise in the Alps, while vulnerabilities are increasing in high altitude and in valleys. Due to a lack of systematic observations, frequency and magnitude of rockfalls, as well as their triggering factors remain poorly understood. We here analyse different inventories of rockfalls acquired in the whole Mont Blanc massif by three innovative methods in order to emphasize the role of permafrost. Permafrost degradation appears to be the most likely triggering factor. In particular, almost all of the recorded rockfalls occurred in a context of permafrost, a very good correlation exists between climate (temperatures) and rockfalls, the other temperature-dependent factors may only explain a little part of the rockfalls, and topographic factors are highlighting the importance of permafrost in rockfall trigger. Within the context of global warming scenarios for the twenty-first century, these results raise the question of risk assessment and management in high mountain regions. |
author2 |
Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Ravanel, Ludovic Deline, Philip |
spellingShingle |
Ravanel, Ludovic Deline, Philip Permafrost and destabilization of alpine rockwalls: a very close link in the Mont Blanc massif |
author_facet |
Ravanel, Ludovic Deline, Philip |
author_sort |
Ravanel, Ludovic |
title |
Permafrost and destabilization of alpine rockwalls: a very close link in the Mont Blanc massif |
title_short |
Permafrost and destabilization of alpine rockwalls: a very close link in the Mont Blanc massif |
title_full |
Permafrost and destabilization of alpine rockwalls: a very close link in the Mont Blanc massif |
title_fullStr |
Permafrost and destabilization of alpine rockwalls: a very close link in the Mont Blanc massif |
title_full_unstemmed |
Permafrost and destabilization of alpine rockwalls: a very close link in the Mont Blanc massif |
title_sort |
permafrost and destabilization of alpine rockwalls: a very close link in the mont blanc massif |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/halsde-00873382 |
op_coverage |
Rome, Italy |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Proceedings of the 2nd World landslide Forum, Rome 2nd World landslide Forum https://hal.science/halsde-00873382 2nd World landslide Forum, 2011, Rome, Italy. pp. 397-402 |
op_relation |
halsde-00873382 https://hal.science/halsde-00873382 |
_version_ |
1797567606494855168 |