SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0
Subglacial hydrology has a strong influence on glacier and ice sheet dynamics, particularly through the dependence of sliding velocity on subglacial water pressure. Significant challenges are involved in modeling subglacial hydrology, as the drainage geometry and flow mechanics are constantly changi...
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ftdoajarticles:oai:doaj.org/article:513750dca389432e9de2b6e85cf1936f 2023-05-15T16:40:42+02:00 SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0 A. Sommers H. Rajaram M. Morlighem 2018-07-01T00:00:00Z https://doi.org/10.5194/gmd-11-2955-2018 https://doaj.org/article/513750dca389432e9de2b6e85cf1936f EN eng Copernicus Publications https://www.geosci-model-dev.net/11/2955/2018/gmd-11-2955-2018.pdf https://doaj.org/toc/1991-959X https://doaj.org/toc/1991-9603 doi:10.5194/gmd-11-2955-2018 1991-959X 1991-9603 https://doaj.org/article/513750dca389432e9de2b6e85cf1936f Geoscientific Model Development, Vol 11, Pp 2955-2974 (2018) Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/gmd-11-2955-2018 2022-12-31T15:27:57Z Subglacial hydrology has a strong influence on glacier and ice sheet dynamics, particularly through the dependence of sliding velocity on subglacial water pressure. Significant challenges are involved in modeling subglacial hydrology, as the drainage geometry and flow mechanics are constantly changing, with complex feedbacks that play out between water and ice. A clear tradition has been established in the subglacial hydrology modeling literature of distinguishing between channelized (efficient) and sheetlike (inefficient or distributed) drainage systems or components and using slightly different forms of the governing equations in each subsystem to represent the dominant physics. Specifically, many previous subglacial hydrology models disregard opening by melt in the sheetlike system or redistribute it to adjacent channel elements in order to avoid runaway growth that occurs when it is included in the sheetlike system. We present a new subglacial hydrology model, SHAKTI (Subglacial Hydrology and Kinetic, Transient Interactions), in which a single set of governing equations is used everywhere, including opening by melt in the entire domain. SHAKTI employs a generalized relationship between the subglacial water flux and the hydraulic gradient that allows for the representation of laminar, turbulent, and transitional regimes depending on the local Reynolds number. This formulation allows for the coexistence of these flow regimes in different regions, and the configuration and geometry of the subglacial system evolves naturally to represent sheetlike drainage as well as systematic channelized drainage under appropriate conditions. We present steady and transient example simulations to illustrate the features and capabilities of the model and to examine sensitivity to mesh size and time step size. The model is implemented as part of the Ice Sheet System Model (ISSM). Article in Journal/Newspaper Ice Sheet Directory of Open Access Journals: DOAJ Articles Geoscientific Model Development 11 7 2955 2974 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 |
spellingShingle |
Geology QE1-996.5 A. Sommers H. Rajaram M. Morlighem SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0 |
topic_facet |
Geology QE1-996.5 |
description |
Subglacial hydrology has a strong influence on glacier and ice sheet dynamics, particularly through the dependence of sliding velocity on subglacial water pressure. Significant challenges are involved in modeling subglacial hydrology, as the drainage geometry and flow mechanics are constantly changing, with complex feedbacks that play out between water and ice. A clear tradition has been established in the subglacial hydrology modeling literature of distinguishing between channelized (efficient) and sheetlike (inefficient or distributed) drainage systems or components and using slightly different forms of the governing equations in each subsystem to represent the dominant physics. Specifically, many previous subglacial hydrology models disregard opening by melt in the sheetlike system or redistribute it to adjacent channel elements in order to avoid runaway growth that occurs when it is included in the sheetlike system. We present a new subglacial hydrology model, SHAKTI (Subglacial Hydrology and Kinetic, Transient Interactions), in which a single set of governing equations is used everywhere, including opening by melt in the entire domain. SHAKTI employs a generalized relationship between the subglacial water flux and the hydraulic gradient that allows for the representation of laminar, turbulent, and transitional regimes depending on the local Reynolds number. This formulation allows for the coexistence of these flow regimes in different regions, and the configuration and geometry of the subglacial system evolves naturally to represent sheetlike drainage as well as systematic channelized drainage under appropriate conditions. We present steady and transient example simulations to illustrate the features and capabilities of the model and to examine sensitivity to mesh size and time step size. The model is implemented as part of the Ice Sheet System Model (ISSM). |
format |
Article in Journal/Newspaper |
author |
A. Sommers H. Rajaram M. Morlighem |
author_facet |
A. Sommers H. Rajaram M. Morlighem |
author_sort |
A. Sommers |
title |
SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0 |
title_short |
SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0 |
title_full |
SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0 |
title_fullStr |
SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0 |
title_full_unstemmed |
SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0 |
title_sort |
shakti: subglacial hydrology and kinetic, transient interactions v1.0 |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/gmd-11-2955-2018 https://doaj.org/article/513750dca389432e9de2b6e85cf1936f |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geoscientific Model Development, Vol 11, Pp 2955-2974 (2018) |
op_relation |
https://www.geosci-model-dev.net/11/2955/2018/gmd-11-2955-2018.pdf https://doaj.org/toc/1991-959X https://doaj.org/toc/1991-9603 doi:10.5194/gmd-11-2955-2018 1991-959X 1991-9603 https://doaj.org/article/513750dca389432e9de2b6e85cf1936f |
op_doi |
https://doi.org/10.5194/gmd-11-2955-2018 |
container_title |
Geoscientific Model Development |
container_volume |
11 |
container_issue |
7 |
container_start_page |
2955 |
op_container_end_page |
2974 |
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1766031104594149376 |