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A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers
Below hard‐bedded glaciers, both basal friction and distributed subglacial drainage are thought to be controlled by a network of cavities. Previous coupled hydro‐mechanical models, however, describe cavity‐driven friction and hydraulic transmissivity independently, resulting in a physically inconsis...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9540583/ https://www.ncbi.nlm.nih.gov/pubmed/36245953 http://dx.doi.org/10.1029/2021GL097507 |
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author | Gilbert, Adrien Gimbert, Florent Thøgersen, Kjetil Schuler, Thomas V. Kääb, Andreas |
author_facet | Gilbert, Adrien Gimbert, Florent Thøgersen, Kjetil Schuler, Thomas V. Kääb, Andreas |
author_sort | Gilbert, Adrien |
collection | PubMed |
description | Below hard‐bedded glaciers, both basal friction and distributed subglacial drainage are thought to be controlled by a network of cavities. Previous coupled hydro‐mechanical models, however, describe cavity‐driven friction and hydraulic transmissivity independently, resulting in a physically inconsistent cavity evolution between the two components of the models. Here, we overcome this issue by describing the hydro‐mechanical system using a common cavity‐evolution description, that governs both transient friction and hydraulic transmissivity. We show that our coupling approach is superior to previous formulations in explaining a unique observation record of glacier sliding speed from the French Alps. We find that, at multi‐day to multi‐decadal timescales, sliding speed can be expressed as a direct function of basal shear stress and water discharge, without accounting for water pressure, which simply adjusts to maintain the cavitation ratio needed to accommodate the water supply. |
format | Online Article Text |
id | pubmed-9540583 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-95405832022-10-14 A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers Gilbert, Adrien Gimbert, Florent Thøgersen, Kjetil Schuler, Thomas V. Kääb, Andreas Geophys Res Lett Research Letter Below hard‐bedded glaciers, both basal friction and distributed subglacial drainage are thought to be controlled by a network of cavities. Previous coupled hydro‐mechanical models, however, describe cavity‐driven friction and hydraulic transmissivity independently, resulting in a physically inconsistent cavity evolution between the two components of the models. Here, we overcome this issue by describing the hydro‐mechanical system using a common cavity‐evolution description, that governs both transient friction and hydraulic transmissivity. We show that our coupling approach is superior to previous formulations in explaining a unique observation record of glacier sliding speed from the French Alps. We find that, at multi‐day to multi‐decadal timescales, sliding speed can be expressed as a direct function of basal shear stress and water discharge, without accounting for water pressure, which simply adjusts to maintain the cavitation ratio needed to accommodate the water supply. John Wiley and Sons Inc. 2022-07-08 2022-07-16 /pmc/articles/PMC9540583/ /pubmed/36245953 http://dx.doi.org/10.1029/2021GL097507 Text en © 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Letter Gilbert, Adrien Gimbert, Florent Thøgersen, Kjetil Schuler, Thomas V. Kääb, Andreas A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers |
title | A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers |
title_full | A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers |
title_fullStr | A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers |
title_full_unstemmed | A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers |
title_short | A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers |
title_sort | consistent framework for coupling basal friction with subglacial hydrology on hard‐bedded glaciers |
topic | Research Letter |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9540583/ https://www.ncbi.nlm.nih.gov/pubmed/36245953 http://dx.doi.org/10.1029/2021GL097507 |
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