Statistical modelling of rock wall permafrost distribution: application to the Mont Blanc massif
International audience The study of rock wall permafrost has only started ten years ago. The understanding of the role of permafrost degradation in rock wall instabilities must be firstly based on the knowledge of its spatial distribution. The difficulties in mapping rock wall permafrost result as m...
Main Authors: | , , , , |
---|---|
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2015
|
Subjects: | |
Online Access: | https://hal-sde.archives-ouvertes.fr/hal-01120617 |
id |
ftccsdartic:oai:HAL:hal-01120617v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-01120617v1 2023-05-15T17:55:22+02:00 Statistical modelling of rock wall permafrost distribution: application to the Mont Blanc massif Modélisation statistique de la distribution du permafrost de paroi : application au massif du Mont Blanc Magnin, Florence Brenning, Alexander Bodin, Xavier Deline, Philip Ravanel, Ludovic Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) Department of Geography and Environmental Management Waterloo University of Waterloo Waterloo 2015 https://hal-sde.archives-ouvertes.fr/hal-01120617 en eng HAL CCSD Groupe français de géomorphologie (GFG) hal-01120617 https://hal-sde.archives-ouvertes.fr/hal-01120617 ISSN: 1266-5304 EISSN: 1957-777X Géomorphologie : relief, processus, environnement https://hal-sde.archives-ouvertes.fr/hal-01120617 Géomorphologie : relief, processus, environnement, Groupe français de géomorphologie (GFG), 2015, pp.20 temperature offset surface temperature alpine rock walls distributed modelling permafrost offset de température température de surface modélisation distribuée parois alpines [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2015 ftccsdartic 2021-09-12T00:42:56Z International audience The study of rock wall permafrost has only started ten years ago. The understanding of the role of permafrost degradation in rock wall instabilities must be firstly based on the knowledge of its spatial distribution. The difficulties in mapping rock wall permafrost result as much from its invisibility as its extreme sensitivity to local settings. Thus its modelling becomes an essential tool. An empirico-statistical model built for the mapping of permafrost probability in the rock walls at an Alpine scale is here applied to the Mont Blanc massif, integrating local input variables with high spatial resolution. The importance of the spatial resolution for modelling rock wall permafrost is highlighted: differences in output temperature for the same model can reach up to 2°C between 4 m and 30 m spatial resolutions. A map of the permafrost in the massif rock walls is proposed. 45 to 79% of the 86 km² of steep rock faces ≥ 40° would be underlain by permafrost. It would be present from 1900 m a.s.l in north faces and 2600 m a.s.l.in south faces in case of favourable local structural settings. Its presence would be more continuous from 2600 and 3000 m a.s.l., respectively, but it would occupy the totality of the rock walls, in any aspect from 3600 m a.s.l. The interpretation of the permafrost index map requires the understanding of the effects of factors that are not taken into account in the model and that favour its occurrence beyond the topoclimatic control, such as fractures and snow cover. L’étude du permafrost de paroi rocheuse a débuté depuis à peine une décennie. La compréhension du rôle de la dégradation du permafrost sur l’instabilité des parois rocheuses se fonde en premier lieu sur la connaissance de sa distribution spatiale. Les difficultés de la cartographie du permafrost de paroi résultent de son invisibilité et de son extrême sensibilité aux conditions locales, ce qui rend sa modélisation indispensable. Un modèle statistico-empirique élaboré pour cartographier le permafrost à ... Article in Journal/Newspaper permafrost Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Peine ENVELOPE(-54.683,-54.683,-63.417,-63.417) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
temperature offset surface temperature alpine rock walls distributed modelling permafrost offset de température température de surface modélisation distribuée parois alpines [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
temperature offset surface temperature alpine rock walls distributed modelling permafrost offset de température température de surface modélisation distribuée parois alpines [SDE.MCG]Environmental Sciences/Global Changes Magnin, Florence Brenning, Alexander Bodin, Xavier Deline, Philip Ravanel, Ludovic Statistical modelling of rock wall permafrost distribution: application to the Mont Blanc massif |
topic_facet |
temperature offset surface temperature alpine rock walls distributed modelling permafrost offset de température température de surface modélisation distribuée parois alpines [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The study of rock wall permafrost has only started ten years ago. The understanding of the role of permafrost degradation in rock wall instabilities must be firstly based on the knowledge of its spatial distribution. The difficulties in mapping rock wall permafrost result as much from its invisibility as its extreme sensitivity to local settings. Thus its modelling becomes an essential tool. An empirico-statistical model built for the mapping of permafrost probability in the rock walls at an Alpine scale is here applied to the Mont Blanc massif, integrating local input variables with high spatial resolution. The importance of the spatial resolution for modelling rock wall permafrost is highlighted: differences in output temperature for the same model can reach up to 2°C between 4 m and 30 m spatial resolutions. A map of the permafrost in the massif rock walls is proposed. 45 to 79% of the 86 km² of steep rock faces ≥ 40° would be underlain by permafrost. It would be present from 1900 m a.s.l in north faces and 2600 m a.s.l.in south faces in case of favourable local structural settings. Its presence would be more continuous from 2600 and 3000 m a.s.l., respectively, but it would occupy the totality of the rock walls, in any aspect from 3600 m a.s.l. The interpretation of the permafrost index map requires the understanding of the effects of factors that are not taken into account in the model and that favour its occurrence beyond the topoclimatic control, such as fractures and snow cover. L’étude du permafrost de paroi rocheuse a débuté depuis à peine une décennie. La compréhension du rôle de la dégradation du permafrost sur l’instabilité des parois rocheuses se fonde en premier lieu sur la connaissance de sa distribution spatiale. Les difficultés de la cartographie du permafrost de paroi résultent de son invisibilité et de son extrême sensibilité aux conditions locales, ce qui rend sa modélisation indispensable. Un modèle statistico-empirique élaboré pour cartographier le permafrost à ... |
author2 |
Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) Department of Geography and Environmental Management Waterloo University of Waterloo Waterloo |
format |
Article in Journal/Newspaper |
author |
Magnin, Florence Brenning, Alexander Bodin, Xavier Deline, Philip Ravanel, Ludovic |
author_facet |
Magnin, Florence Brenning, Alexander Bodin, Xavier Deline, Philip Ravanel, Ludovic |
author_sort |
Magnin, Florence |
title |
Statistical modelling of rock wall permafrost distribution: application to the Mont Blanc massif |
title_short |
Statistical modelling of rock wall permafrost distribution: application to the Mont Blanc massif |
title_full |
Statistical modelling of rock wall permafrost distribution: application to the Mont Blanc massif |
title_fullStr |
Statistical modelling of rock wall permafrost distribution: application to the Mont Blanc massif |
title_full_unstemmed |
Statistical modelling of rock wall permafrost distribution: application to the Mont Blanc massif |
title_sort |
statistical modelling of rock wall permafrost distribution: application to the mont blanc massif |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal-sde.archives-ouvertes.fr/hal-01120617 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) ENVELOPE(-54.683,-54.683,-63.417,-63.417) |
geographic |
Mont Blanc Peine |
geographic_facet |
Mont Blanc Peine |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
ISSN: 1266-5304 EISSN: 1957-777X Géomorphologie : relief, processus, environnement https://hal-sde.archives-ouvertes.fr/hal-01120617 Géomorphologie : relief, processus, environnement, Groupe français de géomorphologie (GFG), 2015, pp.20 |
op_relation |
hal-01120617 https://hal-sde.archives-ouvertes.fr/hal-01120617 |
_version_ |
1766163300603658240 |