Modelling the source of glacial earthquakes
International audience One current concern in Climate Sciences is the estimation of the annual amount of ice lost by glaciers and the corresponding rate of sea level rise. Greenland ice sheet contribution is significant with about 30% to the global ice mass losses. Ice loss in Greenland is distribut...
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Language: | English |
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HAL CCSD
2021
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Online Access: | https://hal.science/hal-03380228 https://doi.org/10.5194/egusphere-egu21-8915 |
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ftunivnantes:oai:HAL:hal-03380228v1 |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
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English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Bonnet, Pauline Yastrebov, Vladislav Mangeney, Anne Castelnau, Olivier Leroyer, Alban Queutey, Patrick Rueckamp, Martin Stutzmann, Eleonore Montagner, Jean-Paul Sergeant, Amandine Modelling the source of glacial earthquakes |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience One current concern in Climate Sciences is the estimation of the annual amount of ice lost by glaciers and the corresponding rate of sea level rise. Greenland ice sheet contribution is significant with about 30% to the global ice mass losses. Ice loss in Greenland is distributed approximately equally between loss in land by surface melting and loss at the front of marine-terminating glaciers that is modulated by dynamic processes. Dynamic mass loss includes both submarine melting and iceberg calving. The processes that control ablation at tidewater glacier termini, glacier retreat and calving are complex, setting the limits to the estimation of dynamic mass loss and the relation to glacier dynamics. It involves interactions between bedrock – glacier – icebergs – ice-mélange – water – atmosphere. Moreover, the capsize of cubic kilometer scale icebergs close to a glacier front can destabilize the glacier, generate tsunami waves, and induce mixing of the water column which can impact both the local fauna and flora. We aim to improve the physical understanding of the response of glacier front to the force of a capsizing iceberg against the terminus. For this, we use a mechanical model of iceberg capsize against the mobile glacier interacting with the solid earth through a frictional contact and we constrain it with measured surface displacements and seismic waves that are recorded at teleseismic distances. Our strategy is to construct a solid dynamics model, using a finite element solver, involving a deformable glacier, basal contact and friction, and simplified iceberg-water interactions. We fine-tune the parameters of these hydrodynamic effects on an iceberg capsizing in free ocean with the help of reference direct numerical simulations of fluid-structure interactions involving full resolution of Navier-Stokes equations. We simulate the response of a visco-elastic near-grounded glacier to the capsize of an iceberg close to the terminus. We assess the influence of the glacier geometry, the ... |
author2 |
Centre des Matériaux (CDM) Mines Paris - PSL (École nationale supérieure des mines de Paris) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM) Conservatoire National des Arts et Métiers CNAM (CNAM) HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM) Laboratoire de recherche en Hydrodynamique, Énergétique et Environnement Atmosphérique (LHEEA) École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS) Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-27570 Bremerhaven, Germany |
format |
Conference Object |
author |
Bonnet, Pauline Yastrebov, Vladislav Mangeney, Anne Castelnau, Olivier Leroyer, Alban Queutey, Patrick Rueckamp, Martin Stutzmann, Eleonore Montagner, Jean-Paul Sergeant, Amandine |
author_facet |
Bonnet, Pauline Yastrebov, Vladislav Mangeney, Anne Castelnau, Olivier Leroyer, Alban Queutey, Patrick Rueckamp, Martin Stutzmann, Eleonore Montagner, Jean-Paul Sergeant, Amandine |
author_sort |
Bonnet, Pauline |
title |
Modelling the source of glacial earthquakes |
title_short |
Modelling the source of glacial earthquakes |
title_full |
Modelling the source of glacial earthquakes |
title_fullStr |
Modelling the source of glacial earthquakes |
title_full_unstemmed |
Modelling the source of glacial earthquakes |
title_sort |
modelling the source of glacial earthquakes |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03380228 https://doi.org/10.5194/egusphere-egu21-8915 |
op_coverage |
on-line, Austria |
genre |
glacier Greenland Ice Sheet Tidewater |
genre_facet |
glacier Greenland Ice Sheet Tidewater |
op_source |
EGU General Assembly 2021 https://hal.science/hal-03380228 EGU General Assembly 2021, Apr 2021, on-line, Austria. ⟨10.5194/egusphere-egu21-8915⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-8915 hal-03380228 https://hal.science/hal-03380228 doi:10.5194/egusphere-egu21-8915 |
op_rights |
http://creativecommons.org/licenses/by-nc/ |
op_doi |
https://doi.org/10.5194/egusphere-egu21-8915 |
_version_ |
1799480272796778496 |
spelling |
ftunivnantes:oai:HAL:hal-03380228v1 2024-05-19T07:40:41+00:00 Modelling the source of glacial earthquakes Bonnet, Pauline Yastrebov, Vladislav Mangeney, Anne Castelnau, Olivier Leroyer, Alban Queutey, Patrick Rueckamp, Martin Stutzmann, Eleonore Montagner, Jean-Paul Sergeant, Amandine Centre des Matériaux (CDM) Mines Paris - PSL (École nationale supérieure des mines de Paris) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM) Conservatoire National des Arts et Métiers CNAM (CNAM) HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM) Laboratoire de recherche en Hydrodynamique, Énergétique et Environnement Atmosphérique (LHEEA) École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS) Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-27570 Bremerhaven, Germany on-line, Austria 2021-04-19 https://hal.science/hal-03380228 https://doi.org/10.5194/egusphere-egu21-8915 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-8915 hal-03380228 https://hal.science/hal-03380228 doi:10.5194/egusphere-egu21-8915 http://creativecommons.org/licenses/by-nc/ EGU General Assembly 2021 https://hal.science/hal-03380228 EGU General Assembly 2021, Apr 2021, on-line, Austria. ⟨10.5194/egusphere-egu21-8915⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2021 ftunivnantes https://doi.org/10.5194/egusphere-egu21-8915 2024-04-25T00:32:21Z International audience One current concern in Climate Sciences is the estimation of the annual amount of ice lost by glaciers and the corresponding rate of sea level rise. Greenland ice sheet contribution is significant with about 30% to the global ice mass losses. Ice loss in Greenland is distributed approximately equally between loss in land by surface melting and loss at the front of marine-terminating glaciers that is modulated by dynamic processes. Dynamic mass loss includes both submarine melting and iceberg calving. The processes that control ablation at tidewater glacier termini, glacier retreat and calving are complex, setting the limits to the estimation of dynamic mass loss and the relation to glacier dynamics. It involves interactions between bedrock – glacier – icebergs – ice-mélange – water – atmosphere. Moreover, the capsize of cubic kilometer scale icebergs close to a glacier front can destabilize the glacier, generate tsunami waves, and induce mixing of the water column which can impact both the local fauna and flora. We aim to improve the physical understanding of the response of glacier front to the force of a capsizing iceberg against the terminus. For this, we use a mechanical model of iceberg capsize against the mobile glacier interacting with the solid earth through a frictional contact and we constrain it with measured surface displacements and seismic waves that are recorded at teleseismic distances. Our strategy is to construct a solid dynamics model, using a finite element solver, involving a deformable glacier, basal contact and friction, and simplified iceberg-water interactions. We fine-tune the parameters of these hydrodynamic effects on an iceberg capsizing in free ocean with the help of reference direct numerical simulations of fluid-structure interactions involving full resolution of Navier-Stokes equations. We simulate the response of a visco-elastic near-grounded glacier to the capsize of an iceberg close to the terminus. We assess the influence of the glacier geometry, the ... Conference Object glacier Greenland Ice Sheet Tidewater Université de Nantes: HAL-UNIV-NANTES |