Improvement of a 2-D SIA ice-flow model: application to Glacier de Saint-Sorlin, France
International audience A number of improvements have been made to an existing two-dimensional ice-flow model applied to an alpine glacier. Analysis of the results of the existing model revealed several shortcomings. The first concerns the lack of mass conservation of the applied alternating-directio...
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ftunivsavoie:oai:HAL:insu-00377267v1 2024-04-28T08:26:50+00:00 Improvement of a 2-D SIA ice-flow model: application to Glacier de Saint-Sorlin, France Schafer, Martina Le Meur, Emmanuel 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) 2007 https://insu.hal.science/insu-00377267 https://insu.hal.science/insu-00377267/document https://insu.hal.science/insu-00377267/file/improvement-of-a-2-d-sia-ice-flow-model-application-to-glacier-de-saint-sorlin-france.pdf https://doi.org/10.3189/002214307784409234 en eng HAL CCSD International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.3189/002214307784409234 insu-00377267 https://insu.hal.science/insu-00377267 https://insu.hal.science/insu-00377267/document https://insu.hal.science/insu-00377267/file/improvement-of-a-2-d-sia-ice-flow-model-application-to-glacier-de-saint-sorlin-france.pdf doi:10.3189/002214307784409234 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://insu.hal.science/insu-00377267 Journal of Glaciology, 2007, 53 (183), pp.713 à 722. ⟨10.3189/002214307784409234⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2007 ftunivsavoie https://doi.org/10.3189/002214307784409234 2024-04-11T00:37:57Z International audience A number of improvements have been made to an existing two-dimensional ice-flow model applied to an alpine glacier. Analysis of the results of the existing model revealed several shortcomings. The first concerns the lack of mass conservation of the applied alternating-direction-implicit (ADI) scheme. A semi-implicit (SI) scheme is therefore proposed and the effects on mass conservation assessed by a comparison with the ADI scheme. The comparison is first carried out with a simple theoretical glacier for which the improvement is significant. Concerning the real case of Glacier de Saint-Sorlin, France, the initial deviation in mass conservation was much less pronounced such that the new scheme, although improving mass conservation, does not significantly change the modelled dynamics. However, other shortcomings that have a more profound impact on the modelling of glacier behaviour have been identified. The ice thickness may become negative over some gridpoints, leading to an inconsistency. The problem is partly resolved by incorporating extra checks on critical gridpoints at the glacier border. Finally, with the help of ice particle tracking, unrealistic ice settlement above the bergschrund has been identified as the main reason for spurious dynamic effects and has been corrected. Article in Journal/Newspaper Journal of Glaciology Université Savoie Mont Blanc: HAL Journal of Glaciology 53 183 713 722 |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
op_collection_id |
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 Schafer, Martina Le Meur, Emmanuel Improvement of a 2-D SIA ice-flow model: application to Glacier de Saint-Sorlin, France |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience A number of improvements have been made to an existing two-dimensional ice-flow model applied to an alpine glacier. Analysis of the results of the existing model revealed several shortcomings. The first concerns the lack of mass conservation of the applied alternating-direction-implicit (ADI) scheme. A semi-implicit (SI) scheme is therefore proposed and the effects on mass conservation assessed by a comparison with the ADI scheme. The comparison is first carried out with a simple theoretical glacier for which the improvement is significant. Concerning the real case of Glacier de Saint-Sorlin, France, the initial deviation in mass conservation was much less pronounced such that the new scheme, although improving mass conservation, does not significantly change the modelled dynamics. However, other shortcomings that have a more profound impact on the modelling of glacier behaviour have been identified. The ice thickness may become negative over some gridpoints, leading to an inconsistency. The problem is partly resolved by incorporating extra checks on critical gridpoints at the glacier border. Finally, with the help of ice particle tracking, unrealistic ice settlement above the bergschrund has been identified as the main reason for spurious dynamic effects and has been corrected. |
author2 |
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) |
format |
Article in Journal/Newspaper |
author |
Schafer, Martina Le Meur, Emmanuel |
author_facet |
Schafer, Martina Le Meur, Emmanuel |
author_sort |
Schafer, Martina |
title |
Improvement of a 2-D SIA ice-flow model: application to Glacier de Saint-Sorlin, France |
title_short |
Improvement of a 2-D SIA ice-flow model: application to Glacier de Saint-Sorlin, France |
title_full |
Improvement of a 2-D SIA ice-flow model: application to Glacier de Saint-Sorlin, France |
title_fullStr |
Improvement of a 2-D SIA ice-flow model: application to Glacier de Saint-Sorlin, France |
title_full_unstemmed |
Improvement of a 2-D SIA ice-flow model: application to Glacier de Saint-Sorlin, France |
title_sort |
improvement of a 2-d sia ice-flow model: application to glacier de saint-sorlin, france |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://insu.hal.science/insu-00377267 https://insu.hal.science/insu-00377267/document https://insu.hal.science/insu-00377267/file/improvement-of-a-2-d-sia-ice-flow-model-application-to-glacier-de-saint-sorlin-france.pdf https://doi.org/10.3189/002214307784409234 |
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-00377267 Journal of Glaciology, 2007, 53 (183), pp.713 à 722. ⟨10.3189/002214307784409234⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/002214307784409234 insu-00377267 https://insu.hal.science/insu-00377267 https://insu.hal.science/insu-00377267/document https://insu.hal.science/insu-00377267/file/improvement-of-a-2-d-sia-ice-flow-model-application-to-glacier-de-saint-sorlin-france.pdf doi:10.3189/002214307784409234 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3189/002214307784409234 |
container_title |
Journal of Glaciology |
container_volume |
53 |
container_issue |
183 |
container_start_page |
713 |
op_container_end_page |
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