Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers
International audience Surging and streaming of glaciers are modulated by meltwater availability and pressure which controls mechanical coupling at their beds. Using laboratory-scale experimental modelling and palaeoglaciological mapping, we explore how subglacial drainage landsystems control meltwa...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2023
|
Subjects: | |
Online Access: | https://hal.science/hal-03971051 https://hal.science/hal-03971051/document https://hal.science/hal-03971051/file/variations-in-hydraulic-efficiency-of-the-subglacial-drainage-landsystem-control-surging-and-streaming-regimes-of-outlet-glaciers.pdf https://doi.org/10.1017/jog.2022.107 |
id |
ftunivnantes:oai:HAL:hal-03971051v1 |
---|---|
record_format |
openpolar |
spelling |
ftunivnantes:oai:HAL:hal-03971051v1 2024-02-11T10:05:22+01:00 Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers Ravier, Édouard Lelandais, Thomas Vérité, Jean Bourgeois, Olivier Laboratoire de Planétologie et Géosciences - Le Mans (LPG - Le Mans) Laboratoire de Planétologie et Géosciences UMR_C 6112 (LPG) Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ) 2023 https://hal.science/hal-03971051 https://hal.science/hal-03971051/document https://hal.science/hal-03971051/file/variations-in-hydraulic-efficiency-of-the-subglacial-drainage-landsystem-control-surging-and-streaming-regimes-of-outlet-glaciers.pdf https://doi.org/10.1017/jog.2022.107 en eng HAL CCSD International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2022.107 hal-03971051 https://hal.science/hal-03971051 https://hal.science/hal-03971051/document https://hal.science/hal-03971051/file/variations-in-hydraulic-efficiency-of-the-subglacial-drainage-landsystem-control-surging-and-streaming-regimes-of-outlet-glaciers.pdf doi:10.1017/jog.2022.107 info:eu-repo/semantics/OpenAccess ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-03971051 Journal of Glaciology, In press, ⟨10.1017/jog.2022.107⟩ Drainage efficiency experimental modelling ice stream ice surge palaeoglaciology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2023 ftunivnantes https://doi.org/10.1017/jog.2022.107 2024-01-23T23:43:28Z International audience Surging and streaming of glaciers are modulated by meltwater availability and pressure which controls mechanical coupling at their beds. Using laboratory-scale experimental modelling and palaeoglaciological mapping, we explore how subglacial drainage landsystems control meltwater drainage efficiency and ice flow velocities for terrestrial-based ice lobes resting on flat horizontal and permeable beds. Two end-members regimes, surging and streaming, appear in our experiments. The surge regime is characterised by a rapid increase of drainage efficiency through development of tunnel valleys and their tributaries, thus reducing the duration of ice flow speed-up events by lowering water pressures and increasing ice-bed coupling. Tunnel valleys connected to ice lobe margins, submarginal thrust moraines, reduced ice lobe extensions and ephemeral shear margins are the most distinctive characteristics of this regime. The stream regime is characterised by disconnected channels of smaller dimensions unable to evacuate all the meltwater: this prolonged drainage inefficiency leads to sustained high ice flow velocity and steady shear margins. Small and rectilinear meltwater channels devoid of tributaries, often disconnected from ice lobe margins, and lineation swarms are diagnostic of this regime. Article in Journal/Newspaper Journal of Glaciology Université de Nantes: HAL-UNIV-NANTES Journal of Glaciology 1 19 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Drainage efficiency experimental modelling ice stream ice surge palaeoglaciology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
Drainage efficiency experimental modelling ice stream ice surge palaeoglaciology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Ravier, Édouard Lelandais, Thomas Vérité, Jean Bourgeois, Olivier Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers |
topic_facet |
Drainage efficiency experimental modelling ice stream ice surge palaeoglaciology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Surging and streaming of glaciers are modulated by meltwater availability and pressure which controls mechanical coupling at their beds. Using laboratory-scale experimental modelling and palaeoglaciological mapping, we explore how subglacial drainage landsystems control meltwater drainage efficiency and ice flow velocities for terrestrial-based ice lobes resting on flat horizontal and permeable beds. Two end-members regimes, surging and streaming, appear in our experiments. The surge regime is characterised by a rapid increase of drainage efficiency through development of tunnel valleys and their tributaries, thus reducing the duration of ice flow speed-up events by lowering water pressures and increasing ice-bed coupling. Tunnel valleys connected to ice lobe margins, submarginal thrust moraines, reduced ice lobe extensions and ephemeral shear margins are the most distinctive characteristics of this regime. The stream regime is characterised by disconnected channels of smaller dimensions unable to evacuate all the meltwater: this prolonged drainage inefficiency leads to sustained high ice flow velocity and steady shear margins. Small and rectilinear meltwater channels devoid of tributaries, often disconnected from ice lobe margins, and lineation swarms are diagnostic of this regime. |
author2 |
Laboratoire de Planétologie et Géosciences - Le Mans (LPG - Le Mans) Laboratoire de Planétologie et Géosciences UMR_C 6112 (LPG) Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ) |
format |
Article in Journal/Newspaper |
author |
Ravier, Édouard Lelandais, Thomas Vérité, Jean Bourgeois, Olivier |
author_facet |
Ravier, Édouard Lelandais, Thomas Vérité, Jean Bourgeois, Olivier |
author_sort |
Ravier, Édouard |
title |
Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers |
title_short |
Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers |
title_full |
Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers |
title_fullStr |
Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers |
title_full_unstemmed |
Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers |
title_sort |
variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-03971051 https://hal.science/hal-03971051/document https://hal.science/hal-03971051/file/variations-in-hydraulic-efficiency-of-the-subglacial-drainage-landsystem-control-surging-and-streaming-regimes-of-outlet-glaciers.pdf https://doi.org/10.1017/jog.2022.107 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-03971051 Journal of Glaciology, In press, ⟨10.1017/jog.2022.107⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2022.107 hal-03971051 https://hal.science/hal-03971051 https://hal.science/hal-03971051/document https://hal.science/hal-03971051/file/variations-in-hydraulic-efficiency-of-the-subglacial-drainage-landsystem-control-surging-and-streaming-regimes-of-outlet-glaciers.pdf doi:10.1017/jog.2022.107 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1017/jog.2022.107 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
19 |
_version_ |
1790602384645292032 |