Volume and frequency of ice avalanches from Taconnaz hanging glacier, French Alps
International audience Very large volumes of ice break off regularly from Taconnaz hanging glacier, French Alps. During winter, when the snow mantle is unstable, these collapses can trigger very large avalanches that represent a serious threat to inhabited areas below. Photogrammetric measurements h...
Published in: | Annals of Glaciology |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Subjects: | |
Online Access: | https://hal.inrae.fr/hal-02602992 https://hal.inrae.fr/hal-02602992/document https://hal.inrae.fr/hal-02602992/file/volume-and-frequency-of-ice-avalanches-from-taconnaz-hanging-glacier-french-alps.pdf https://doi.org/10.3189/2015AoG70A017 |
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ftccsdartic:oai:HAL:hal-02602992v1 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
GLACIER HAZARDS GLACIOLOGICAL INSTRUMENTS AND METHODS MOUNTAIN GLACIERS GLACIOLOGICAL NATURAL HAZARDS TACONNAZ [SDE]Environmental Sciences |
spellingShingle |
GLACIER HAZARDS GLACIOLOGICAL INSTRUMENTS AND METHODS MOUNTAIN GLACIERS GLACIOLOGICAL NATURAL HAZARDS TACONNAZ [SDE]Environmental Sciences Vincent, C. Thibert, Emmanuel Härter, M. Soruco, A. Gilbert, A. Volume and frequency of ice avalanches from Taconnaz hanging glacier, French Alps |
topic_facet |
GLACIER HAZARDS GLACIOLOGICAL INSTRUMENTS AND METHODS MOUNTAIN GLACIERS GLACIOLOGICAL NATURAL HAZARDS TACONNAZ [SDE]Environmental Sciences |
description |
International audience Very large volumes of ice break off regularly from Taconnaz hanging glacier, French Alps. During winter, when the snow mantle is unstable, these collapses can trigger very large avalanches that represent a serious threat to inhabited areas below. Photogrammetric measurements have been performed over 1 year to assess the volume and frequency of the largest collapses. Major collapses occur when the glacier reaches a critical geometry. After a major ice collapse, the glacier is in a minimal position and subsequently recharges over 6 months to reach the maximum position again. This critical geometry is a necessary but not sufficient condition for further large collapses. Large collapses do not systematically occur in the maximum position, as ice is often removed by disintegration into small ice blocks. For two major collapses, the volume of ice breaking off has been assessed at,similar to 275 000 m(3). Photogrammetric measurements were used to determine an ice flux of 820 000 m(3) a(-1) through the studied ice stream, in agreement with an assessment based on ice-flow modeling. This ice flux estimation was used to determine the average ice volumes breaking off over surveyed periods. |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Erosion torrentielle neige et avalanches (UR ETGR (ETNA)) Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) UNIVERSITY OF MAYOR SAN ANDRES LA PAZ BOL Partenaires IRSTEA Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) GlaRiskAlp Alcotra Programme AQWA European Programme : 212250 |
format |
Article in Journal/Newspaper |
author |
Vincent, C. Thibert, Emmanuel Härter, M. Soruco, A. Gilbert, A. |
author_facet |
Vincent, C. Thibert, Emmanuel Härter, M. Soruco, A. Gilbert, A. |
author_sort |
Vincent, C. |
title |
Volume and frequency of ice avalanches from Taconnaz hanging glacier, French Alps |
title_short |
Volume and frequency of ice avalanches from Taconnaz hanging glacier, French Alps |
title_full |
Volume and frequency of ice avalanches from Taconnaz hanging glacier, French Alps |
title_fullStr |
Volume and frequency of ice avalanches from Taconnaz hanging glacier, French Alps |
title_full_unstemmed |
Volume and frequency of ice avalanches from Taconnaz hanging glacier, French Alps |
title_sort |
volume and frequency of ice avalanches from taconnaz hanging glacier, french alps |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.inrae.fr/hal-02602992 https://hal.inrae.fr/hal-02602992/document https://hal.inrae.fr/hal-02602992/file/volume-and-frequency-of-ice-avalanches-from-taconnaz-hanging-glacier-french-alps.pdf https://doi.org/10.3189/2015AoG70A017 |
genre |
Annals of Glaciology |
genre_facet |
Annals of Glaciology |
op_source |
ISSN: 0260-3055 Annals of Glaciology https://hal.inrae.fr/hal-02602992 Annals of Glaciology, International Glaciological Society, 2015, 56 (70), pp.17-25. ⟨10.3189/2015AoG70A017⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/2015AoG70A017 hal-02602992 https://hal.inrae.fr/hal-02602992 https://hal.inrae.fr/hal-02602992/document https://hal.inrae.fr/hal-02602992/file/volume-and-frequency-of-ice-avalanches-from-taconnaz-hanging-glacier-french-alps.pdf doi:10.3189/2015AoG70A017 IRSTEA: PUB00047507 WOS: 000363001700004 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3189/2015AoG70A017 |
container_title |
Annals of Glaciology |
container_volume |
56 |
container_issue |
70 |
container_start_page |
17 |
op_container_end_page |
25 |
_version_ |
1765999955315523584 |
spelling |
ftccsdartic:oai:HAL:hal-02602992v1 2023-05-15T13:29:20+02:00 Volume and frequency of ice avalanches from Taconnaz hanging glacier, French Alps Vincent, C. Thibert, Emmanuel Härter, M. Soruco, A. Gilbert, A. Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Erosion torrentielle neige et avalanches (UR ETGR (ETNA)) Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) UNIVERSITY OF MAYOR SAN ANDRES LA PAZ BOL Partenaires IRSTEA Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) GlaRiskAlp Alcotra Programme AQWA European Programme : 212250 2015 https://hal.inrae.fr/hal-02602992 https://hal.inrae.fr/hal-02602992/document https://hal.inrae.fr/hal-02602992/file/volume-and-frequency-of-ice-avalanches-from-taconnaz-hanging-glacier-french-alps.pdf https://doi.org/10.3189/2015AoG70A017 en eng HAL CCSD International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.3189/2015AoG70A017 hal-02602992 https://hal.inrae.fr/hal-02602992 https://hal.inrae.fr/hal-02602992/document https://hal.inrae.fr/hal-02602992/file/volume-and-frequency-of-ice-avalanches-from-taconnaz-hanging-glacier-french-alps.pdf doi:10.3189/2015AoG70A017 IRSTEA: PUB00047507 WOS: 000363001700004 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0260-3055 Annals of Glaciology https://hal.inrae.fr/hal-02602992 Annals of Glaciology, International Glaciological Society, 2015, 56 (70), pp.17-25. ⟨10.3189/2015AoG70A017⟩ GLACIER HAZARDS GLACIOLOGICAL INSTRUMENTS AND METHODS MOUNTAIN GLACIERS GLACIOLOGICAL NATURAL HAZARDS TACONNAZ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.3189/2015AoG70A017 2021-10-23T23:43:41Z International audience Very large volumes of ice break off regularly from Taconnaz hanging glacier, French Alps. During winter, when the snow mantle is unstable, these collapses can trigger very large avalanches that represent a serious threat to inhabited areas below. Photogrammetric measurements have been performed over 1 year to assess the volume and frequency of the largest collapses. Major collapses occur when the glacier reaches a critical geometry. After a major ice collapse, the glacier is in a minimal position and subsequently recharges over 6 months to reach the maximum position again. This critical geometry is a necessary but not sufficient condition for further large collapses. Large collapses do not systematically occur in the maximum position, as ice is often removed by disintegration into small ice blocks. For two major collapses, the volume of ice breaking off has been assessed at,similar to 275 000 m(3). Photogrammetric measurements were used to determine an ice flux of 820 000 m(3) a(-1) through the studied ice stream, in agreement with an assessment based on ice-flow modeling. This ice flux estimation was used to determine the average ice volumes breaking off over surveyed periods. Article in Journal/Newspaper Annals of Glaciology Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Annals of Glaciology 56 70 17 25 |