Outburst flood hazard for glacier-dammed Lac de Rochemelon, France
International audience Supraglacial Lac de Rochemelon was formed 50 years ago behind an ice dam and grew steadily until 2004. In October 2004, the volume of the lake reached 650 000 m3, bringing its surface within 0.2 m of the top of the ice dam. To eliminate the threat to towns located below in the...
Published in: | Journal of Glaciology |
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Main Authors: | , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2010
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Online Access: | https://insu.hal.science/insu-00562436 https://insu.hal.science/insu-00562436/document https://insu.hal.science/insu-00562436/file/outburst-flood-hazard-for-glacier-dammed-lac-de-rochemelon-france.pdf https://doi.org/10.3189/002214310791190857 |
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Open Polar |
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Université Savoie Mont Blanc: HAL |
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ftunivsavoie |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Vincent, C. Auclair, Samuel Lemeur, E. Outburst flood hazard for glacier-dammed Lac de Rochemelon, France |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Supraglacial Lac de Rochemelon was formed 50 years ago behind an ice dam and grew steadily until 2004. In October 2004, the volume of the lake reached 650 000 m3, bringing its surface within 0.2 m of the top of the ice dam. To eliminate the threat to towns located below in the event of an overflow, the lake was drained artificially in October 2004 and during the summer of 2005. Once the volume had been reduced to 250 000 m3 by siphoning, a channel was dug with explosives and the remaining water overflowed naturally. This offered a very good opportunity to investigate the breaching of an ice dam accompanied by thermal erosion of the drainage channel. Extensive field measurements were carried out during drainage. Analysis of the energy dissipated in the channel reveals that only half of the available energy was used for breach erosion. A numerical model was used to simulate the evolution of a number of variables during drainage and to study the sensitivity of discharge and ice erosion to different parameters, revealing a high sensitivity to water temperature. Model simulations indicate that natural drainage of this lake at the beginning of October 2004 would have led to a peak discharge of <6 m3 s-1. |
author2 |
CHYC Laboratoire de glaciologie et géophysique de l'environnement (LGGE) 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 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)-Centre National de la Recherche Scientifique (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 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)-Centre National de la Recherche Scientifique (CNRS) Bureau de Recherches Géologiques et Minières (BRGM) EDGe RTM de haute savoie |
format |
Article in Journal/Newspaper |
author |
Vincent, C. Auclair, Samuel Lemeur, E. |
author_facet |
Vincent, C. Auclair, Samuel Lemeur, E. |
author_sort |
Vincent, C. |
title |
Outburst flood hazard for glacier-dammed Lac de Rochemelon, France |
title_short |
Outburst flood hazard for glacier-dammed Lac de Rochemelon, France |
title_full |
Outburst flood hazard for glacier-dammed Lac de Rochemelon, France |
title_fullStr |
Outburst flood hazard for glacier-dammed Lac de Rochemelon, France |
title_full_unstemmed |
Outburst flood hazard for glacier-dammed Lac de Rochemelon, France |
title_sort |
outburst flood hazard for glacier-dammed lac de rochemelon, france |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://insu.hal.science/insu-00562436 https://insu.hal.science/insu-00562436/document https://insu.hal.science/insu-00562436/file/outburst-flood-hazard-for-glacier-dammed-lac-de-rochemelon-france.pdf https://doi.org/10.3189/002214310791190857 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://insu.hal.science/insu-00562436 Journal of Glaciology, 2010, 56 (195), pp.91-100. ⟨10.3189/002214310791190857⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/002214310791190857 insu-00562436 https://insu.hal.science/insu-00562436 https://insu.hal.science/insu-00562436/document https://insu.hal.science/insu-00562436/file/outburst-flood-hazard-for-glacier-dammed-lac-de-rochemelon-france.pdf BIBCODE: 10.3189/002214310791190857 doi:10.3189/002214310791190857 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3189/002214310791190857 |
container_title |
Journal of Glaciology |
container_volume |
56 |
container_issue |
195 |
container_start_page |
91 |
op_container_end_page |
100 |
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1799482959962570752 |
spelling |
ftunivsavoie:oai:HAL:insu-00562436v1 2024-05-19T07:43:14+00:00 Outburst flood hazard for glacier-dammed Lac de Rochemelon, France Vincent, C. Auclair, Samuel Lemeur, E. CHYC Laboratoire de glaciologie et géophysique de l'environnement (LGGE) 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 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)-Centre National de la Recherche Scientifique (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 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)-Centre National de la Recherche Scientifique (CNRS) Bureau de Recherches Géologiques et Minières (BRGM) EDGe RTM de haute savoie 2010-04 https://insu.hal.science/insu-00562436 https://insu.hal.science/insu-00562436/document https://insu.hal.science/insu-00562436/file/outburst-flood-hazard-for-glacier-dammed-lac-de-rochemelon-france.pdf https://doi.org/10.3189/002214310791190857 en eng HAL CCSD International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.3189/002214310791190857 insu-00562436 https://insu.hal.science/insu-00562436 https://insu.hal.science/insu-00562436/document https://insu.hal.science/insu-00562436/file/outburst-flood-hazard-for-glacier-dammed-lac-de-rochemelon-france.pdf BIBCODE: 10.3189/002214310791190857 doi:10.3189/002214310791190857 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://insu.hal.science/insu-00562436 Journal of Glaciology, 2010, 56 (195), pp.91-100. ⟨10.3189/002214310791190857⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2010 ftunivsavoie https://doi.org/10.3189/002214310791190857 2024-05-02T00:13:29Z International audience Supraglacial Lac de Rochemelon was formed 50 years ago behind an ice dam and grew steadily until 2004. In October 2004, the volume of the lake reached 650 000 m3, bringing its surface within 0.2 m of the top of the ice dam. To eliminate the threat to towns located below in the event of an overflow, the lake was drained artificially in October 2004 and during the summer of 2005. Once the volume had been reduced to 250 000 m3 by siphoning, a channel was dug with explosives and the remaining water overflowed naturally. This offered a very good opportunity to investigate the breaching of an ice dam accompanied by thermal erosion of the drainage channel. Extensive field measurements were carried out during drainage. Analysis of the energy dissipated in the channel reveals that only half of the available energy was used for breach erosion. A numerical model was used to simulate the evolution of a number of variables during drainage and to study the sensitivity of discharge and ice erosion to different parameters, revealing a high sensitivity to water temperature. Model simulations indicate that natural drainage of this lake at the beginning of October 2004 would have led to a peak discharge of <6 m3 s-1. Article in Journal/Newspaper Journal of Glaciology Université Savoie Mont Blanc: HAL Journal of Glaciology 56 195 91 100 |