BrAHMs V1.0: a fast, physically based subglacial hydrology model for continental-scale application
We present BrAHMs (BAsal Hydrology Model): a physically based basal hydrology model which represents water flow using Darcian flow in the distributed drainage regime and a fast down-gradient solver in the channelized regime. Switching from distributed to channelized drainage occurs when appropriate...
Published in: | Geoscientific Model Development |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/gmd-11-3497-2018 https://noa.gwlb.de/receive/cop_mods_00004974 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004931/gmd-11-3497-2018.pdf https://gmd.copernicus.org/articles/11/3497/2018/gmd-11-3497-2018.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00004974 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00004974 2023-05-15T16:40:13+02:00 BrAHMs V1.0: a fast, physically based subglacial hydrology model for continental-scale application Kavanagh, Mark Tarasov, Lev 2018-08 electronic https://doi.org/10.5194/gmd-11-3497-2018 https://noa.gwlb.de/receive/cop_mods_00004974 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004931/gmd-11-3497-2018.pdf https://gmd.copernicus.org/articles/11/3497/2018/gmd-11-3497-2018.pdf eng eng Copernicus Publications Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-11-3497-2018 https://noa.gwlb.de/receive/cop_mods_00004974 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004931/gmd-11-3497-2018.pdf https://gmd.copernicus.org/articles/11/3497/2018/gmd-11-3497-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/gmd-11-3497-2018 2022-02-08T22:59:51Z We present BrAHMs (BAsal Hydrology Model): a physically based basal hydrology model which represents water flow using Darcian flow in the distributed drainage regime and a fast down-gradient solver in the channelized regime. Switching from distributed to channelized drainage occurs when appropriate flow conditions are met. The model is designed for long-term integrations of continental ice sheets. The Darcian flow is simulated with a robust combination of the Heun and leapfrog–trapezoidal predictor–corrector schemes. These numerical schemes are applied to a set of flux-conserving equations cast over a staggered grid with water thickness at the centres and fluxes defined at the interface. Basal conditions (e.g., till thickness, hydraulic conductivity) are parameterized so the model is adaptable to a variety of ice sheets. Given the intended scales, basal water pressure is limited to ice overburden pressure, and dynamic time stepping is used to ensure that the Courant–Friedrichs–Lewy (CFL) condition is met for numerical stability. The model is validated with a synthetic ice sheet geometry and different bed topographies to test basic water flow properties and mass conservation. Synthetic ice sheet tests show that the model behaves as expected with water flowing down gradient, forming lakes in a potential well or reaching a terminus and exiting the ice sheet. Channel formation occurs periodically over different sections of the ice sheet and, when extensive, displays the arborescent configuration expected of Röthlisberger channels. The model is also shown to be stable under high-frequency oscillatory meltwater inputs. Article in Journal/Newspaper Ice Sheet Niedersächsisches Online-Archiv NOA Geoscientific Model Development 11 8 3497 3513 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Kavanagh, Mark Tarasov, Lev BrAHMs V1.0: a fast, physically based subglacial hydrology model for continental-scale application |
topic_facet |
article Verlagsveröffentlichung |
description |
We present BrAHMs (BAsal Hydrology Model): a physically based basal hydrology model which represents water flow using Darcian flow in the distributed drainage regime and a fast down-gradient solver in the channelized regime. Switching from distributed to channelized drainage occurs when appropriate flow conditions are met. The model is designed for long-term integrations of continental ice sheets. The Darcian flow is simulated with a robust combination of the Heun and leapfrog–trapezoidal predictor–corrector schemes. These numerical schemes are applied to a set of flux-conserving equations cast over a staggered grid with water thickness at the centres and fluxes defined at the interface. Basal conditions (e.g., till thickness, hydraulic conductivity) are parameterized so the model is adaptable to a variety of ice sheets. Given the intended scales, basal water pressure is limited to ice overburden pressure, and dynamic time stepping is used to ensure that the Courant–Friedrichs–Lewy (CFL) condition is met for numerical stability. The model is validated with a synthetic ice sheet geometry and different bed topographies to test basic water flow properties and mass conservation. Synthetic ice sheet tests show that the model behaves as expected with water flowing down gradient, forming lakes in a potential well or reaching a terminus and exiting the ice sheet. Channel formation occurs periodically over different sections of the ice sheet and, when extensive, displays the arborescent configuration expected of Röthlisberger channels. The model is also shown to be stable under high-frequency oscillatory meltwater inputs. |
format |
Article in Journal/Newspaper |
author |
Kavanagh, Mark Tarasov, Lev |
author_facet |
Kavanagh, Mark Tarasov, Lev |
author_sort |
Kavanagh, Mark |
title |
BrAHMs V1.0: a fast, physically based subglacial hydrology model for continental-scale application |
title_short |
BrAHMs V1.0: a fast, physically based subglacial hydrology model for continental-scale application |
title_full |
BrAHMs V1.0: a fast, physically based subglacial hydrology model for continental-scale application |
title_fullStr |
BrAHMs V1.0: a fast, physically based subglacial hydrology model for continental-scale application |
title_full_unstemmed |
BrAHMs V1.0: a fast, physically based subglacial hydrology model for continental-scale application |
title_sort |
brahms v1.0: a fast, physically based subglacial hydrology model for continental-scale application |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/gmd-11-3497-2018 https://noa.gwlb.de/receive/cop_mods_00004974 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004931/gmd-11-3497-2018.pdf https://gmd.copernicus.org/articles/11/3497/2018/gmd-11-3497-2018.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-11-3497-2018 https://noa.gwlb.de/receive/cop_mods_00004974 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004931/gmd-11-3497-2018.pdf https://gmd.copernicus.org/articles/11/3497/2018/gmd-11-3497-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/gmd-11-3497-2018 |
container_title |
Geoscientific Model Development |
container_volume |
11 |
container_issue |
8 |
container_start_page |
3497 |
op_container_end_page |
3513 |
_version_ |
1766030592214827008 |