A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream
Subglacial hydrology plays an important role in ice sheet dynamics as it determines the sliding velocity. It also drives freshwater into the ocean, leading to undercutting of calving fronts by plumes. Modeling subglacial water has been a challenge for decades. Only recently have new approaches been...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Katlenburg-Lindau : Copernicus
2018
|
Subjects: | |
Online Access: | https://oa.tib.eu/renate/handle/123456789/11315 https://doi.org/10.34657/10350 |
id |
fttibhannoverren:oai:oa.tib.eu:123456789/11315 |
---|---|
record_format |
openpolar |
spelling |
fttibhannoverren:oai:oa.tib.eu:123456789/11315 2023-05-15T16:27:59+02:00 A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream Beyer, Sebastian Kleiner, Thomas Aizinger, Vadym Rückamp, Martin Humbert, Angelika 2018 application/pdf https://oa.tib.eu/renate/handle/123456789/11315 https://doi.org/10.34657/10350 eng eng Katlenburg-Lindau : Copernicus ESSN:1994-0424 DOI:https://doi.org/10.5194/tc-12-3931-2018 https://oa.tib.eu/renate/handle/123456789/11315 http://dx.doi.org/10.34657/10350 CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ frei zugänglich CC-BY The Cryosphere : TC 12 (2018), Nr. 12 caving coastal zone confined aquifer flow modeling flow velocity glacial hydrology hydrological modeling subglacial environment unconfined aquifer ddc:910 ddc:550 status-type:publishedVersion doc-type:article doc-type:Text 2018 fttibhannoverren https://doi.org/10.34657/10350 https://doi.org/10.5194/tc-12-3931-2018 2023-02-13T17:18:08Z Subglacial hydrology plays an important role in ice sheet dynamics as it determines the sliding velocity. It also drives freshwater into the ocean, leading to undercutting of calving fronts by plumes. Modeling subglacial water has been a challenge for decades. Only recently have new approaches been developed such as representing subglacial channels and thin water sheets by separate layers of variable hydraulic conductivity. We extend this concept by modeling a confined-unconfined aquifer system (CUAS) in a single layer of an equivalent porous medium (EPM). The advantage of this formulation is that it prevents unphysical values of pressure at reasonable computational cost. We performed sensitivity tests to investigate the effect of different model parameters. The strongest influence of model parameters was detected in terms of governing the opening and closure of the system. Furthermore, we applied the model to the Northeast Greenland Ice Stream, where an efficient system independent of seasonal input was identified about 500 km downstream from the ice divide. Using the effective pressure from the hydrology model, the Ice Sheet System Model (ISSM) showed considerable improvements in modeled velocities in the coastal region. Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) Greenland |
institution |
Open Polar |
collection |
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
op_collection_id |
fttibhannoverren |
language |
English |
topic |
caving coastal zone confined aquifer flow modeling flow velocity glacial hydrology hydrological modeling subglacial environment unconfined aquifer ddc:910 ddc:550 |
spellingShingle |
caving coastal zone confined aquifer flow modeling flow velocity glacial hydrology hydrological modeling subglacial environment unconfined aquifer ddc:910 ddc:550 Beyer, Sebastian Kleiner, Thomas Aizinger, Vadym Rückamp, Martin Humbert, Angelika A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream |
topic_facet |
caving coastal zone confined aquifer flow modeling flow velocity glacial hydrology hydrological modeling subglacial environment unconfined aquifer ddc:910 ddc:550 |
description |
Subglacial hydrology plays an important role in ice sheet dynamics as it determines the sliding velocity. It also drives freshwater into the ocean, leading to undercutting of calving fronts by plumes. Modeling subglacial water has been a challenge for decades. Only recently have new approaches been developed such as representing subglacial channels and thin water sheets by separate layers of variable hydraulic conductivity. We extend this concept by modeling a confined-unconfined aquifer system (CUAS) in a single layer of an equivalent porous medium (EPM). The advantage of this formulation is that it prevents unphysical values of pressure at reasonable computational cost. We performed sensitivity tests to investigate the effect of different model parameters. The strongest influence of model parameters was detected in terms of governing the opening and closure of the system. Furthermore, we applied the model to the Northeast Greenland Ice Stream, where an efficient system independent of seasonal input was identified about 500 km downstream from the ice divide. Using the effective pressure from the hydrology model, the Ice Sheet System Model (ISSM) showed considerable improvements in modeled velocities in the coastal region. |
format |
Article in Journal/Newspaper |
author |
Beyer, Sebastian Kleiner, Thomas Aizinger, Vadym Rückamp, Martin Humbert, Angelika |
author_facet |
Beyer, Sebastian Kleiner, Thomas Aizinger, Vadym Rückamp, Martin Humbert, Angelika |
author_sort |
Beyer, Sebastian |
title |
A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream |
title_short |
A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream |
title_full |
A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream |
title_fullStr |
A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream |
title_full_unstemmed |
A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream |
title_sort |
confined-unconfined aquifer model for subglacial hydrology and its application to the northeast greenland ice stream |
publisher |
Katlenburg-Lindau : Copernicus |
publishDate |
2018 |
url |
https://oa.tib.eu/renate/handle/123456789/11315 https://doi.org/10.34657/10350 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere : TC 12 (2018), Nr. 12 |
op_relation |
ESSN:1994-0424 DOI:https://doi.org/10.5194/tc-12-3931-2018 https://oa.tib.eu/renate/handle/123456789/11315 http://dx.doi.org/10.34657/10350 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ frei zugänglich |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.34657/10350 https://doi.org/10.5194/tc-12-3931-2018 |
_version_ |
1766017600837386240 |