Improved representation of laminar and turbulent sheet flow in subglacial drainage models
Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet–channel subglacial drainage model to smoothly transition between...
Published in: | Journal of Glaciology |
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Online Access: | https://doi.org/10.1017/jog.2023.103 https://doaj.org/article/011cf0ceb9bb441f8279ac8be948319b |
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ftdoajarticles:oai:doaj.org/article:011cf0ceb9bb441f8279ac8be948319b 2024-02-11T10:05:23+01:00 Improved representation of laminar and turbulent sheet flow in subglacial drainage models Tim Hill Gwenn Elizabeth Flowers Matthew James Hoffman Derek Bingham Mauro Angelo Werder https://doi.org/10.1017/jog.2023.103 https://doaj.org/article/011cf0ceb9bb441f8279ac8be948319b EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S002214302300103X/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.103 0022-1430 1727-5652 https://doaj.org/article/011cf0ceb9bb441f8279ac8be948319b Journal of Glaciology, Pp 1-14 Glacier hydrology glacier modelling subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article ftdoajarticles https://doi.org/10.1017/jog.2023.103 2024-01-14T01:47:15Z Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet–channel subglacial drainage model to smoothly transition between laminar and turbulent flow based on the locally computed Reynolds number in a physically consistent way (the ‘transition’ model). We compare the transition model to standard laminar and turbulent models to assess the role of the sheet-flow parameterization in reconciling observed and modelled water pressures under idealized and realistic forcing. Relative to the turbulent model, the laminar and transition models improve seasonal simulations by increasing winter water pressure and producing a more prominent late-summer water pressure minimum. In contrast to the laminar model, the transition model remains consistent with its own internal assumptions across all flow regimes. Based on the internal consistency of the transition model and its improved performance relative to the standard turbulent model, we recommend its use for transient simulations of subglacial drainage. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 1 38 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glacier hydrology glacier modelling subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Glacier hydrology glacier modelling subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Tim Hill Gwenn Elizabeth Flowers Matthew James Hoffman Derek Bingham Mauro Angelo Werder Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
topic_facet |
Glacier hydrology glacier modelling subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet–channel subglacial drainage model to smoothly transition between laminar and turbulent flow based on the locally computed Reynolds number in a physically consistent way (the ‘transition’ model). We compare the transition model to standard laminar and turbulent models to assess the role of the sheet-flow parameterization in reconciling observed and modelled water pressures under idealized and realistic forcing. Relative to the turbulent model, the laminar and transition models improve seasonal simulations by increasing winter water pressure and producing a more prominent late-summer water pressure minimum. In contrast to the laminar model, the transition model remains consistent with its own internal assumptions across all flow regimes. Based on the internal consistency of the transition model and its improved performance relative to the standard turbulent model, we recommend its use for transient simulations of subglacial drainage. |
format |
Article in Journal/Newspaper |
author |
Tim Hill Gwenn Elizabeth Flowers Matthew James Hoffman Derek Bingham Mauro Angelo Werder |
author_facet |
Tim Hill Gwenn Elizabeth Flowers Matthew James Hoffman Derek Bingham Mauro Angelo Werder |
author_sort |
Tim Hill |
title |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_short |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_full |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_fullStr |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_full_unstemmed |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_sort |
improved representation of laminar and turbulent sheet flow in subglacial drainage models |
publisher |
Cambridge University Press |
url |
https://doi.org/10.1017/jog.2023.103 https://doaj.org/article/011cf0ceb9bb441f8279ac8be948319b |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Pp 1-14 |
op_relation |
https://www.cambridge.org/core/product/identifier/S002214302300103X/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.103 0022-1430 1727-5652 https://doaj.org/article/011cf0ceb9bb441f8279ac8be948319b |
op_doi |
https://doi.org/10.1017/jog.2023.103 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
38 |
_version_ |
1790602393990201344 |