Hydraulic Conductivity as a Proxy for Drainage System Connectivity in a Subglacial Hydrology Model
The link between subglacial hydrology and basal sliding has prompted work on basal hydrology models with water pressure and storage as prognostic variables. We find that a commonly used model of distributed drainage through linked cavities underpredicts winter water pressure when compared to borehol...
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University of Montana
2016
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ftunivmontana:oai:scholarworks.umt.edu:etd-11923 2023-07-16T03:58:46+02:00 Hydraulic Conductivity as a Proxy for Drainage System Connectivity in a Subglacial Hydrology Model Downs, Jacob Z 2016-01-01T08:00:00Z application/pdf https://scholarworks.umt.edu/etd/10877 https://scholarworks.umt.edu/context/etd/article/11923/viewcontent/Downs_Jacob_Thesis.pdf unknown University of Montana https://scholarworks.umt.edu/etd/10877 https://scholarworks.umt.edu/context/etd/article/11923/viewcontent/Downs_Jacob_Thesis.pdf Graduate Student Theses, Dissertations, & Professional Papers subglacial hydrology hydraulic conductivity glaciology modeling Numerical Analysis and Scientific Computing thesis 2016 ftunivmontana 2023-06-27T23:00:13Z The link between subglacial hydrology and basal sliding has prompted work on basal hydrology models with water pressure and storage as prognostic variables. We find that a commonly used model of distributed drainage through linked cavities underpredicts winter water pressure when compared to borehole observations from Issunguata Sermia in Western Central Greenland. Possible causes for this discrepancy including unrealistic model inputs or unconstrained parameters are investigated through a series of modeling experiments on both synthetic and realistic ice sheet geometries. We find that conductivity acts as a proxy for the connectivity of the linked cavity system and should therefore change seasonally. Model experiments also suggest that trends in winter sliding velocity are more closely related to winter water storage rather than pressure. Thesis Greenland Ice Sheet University of Montana: ScholarWorks Greenland |
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University of Montana: ScholarWorks |
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ftunivmontana |
language |
unknown |
topic |
subglacial hydrology hydraulic conductivity glaciology modeling Numerical Analysis and Scientific Computing |
spellingShingle |
subglacial hydrology hydraulic conductivity glaciology modeling Numerical Analysis and Scientific Computing Downs, Jacob Z Hydraulic Conductivity as a Proxy for Drainage System Connectivity in a Subglacial Hydrology Model |
topic_facet |
subglacial hydrology hydraulic conductivity glaciology modeling Numerical Analysis and Scientific Computing |
description |
The link between subglacial hydrology and basal sliding has prompted work on basal hydrology models with water pressure and storage as prognostic variables. We find that a commonly used model of distributed drainage through linked cavities underpredicts winter water pressure when compared to borehole observations from Issunguata Sermia in Western Central Greenland. Possible causes for this discrepancy including unrealistic model inputs or unconstrained parameters are investigated through a series of modeling experiments on both synthetic and realistic ice sheet geometries. We find that conductivity acts as a proxy for the connectivity of the linked cavity system and should therefore change seasonally. Model experiments also suggest that trends in winter sliding velocity are more closely related to winter water storage rather than pressure. |
format |
Thesis |
author |
Downs, Jacob Z |
author_facet |
Downs, Jacob Z |
author_sort |
Downs, Jacob Z |
title |
Hydraulic Conductivity as a Proxy for Drainage System Connectivity in a Subglacial Hydrology Model |
title_short |
Hydraulic Conductivity as a Proxy for Drainage System Connectivity in a Subglacial Hydrology Model |
title_full |
Hydraulic Conductivity as a Proxy for Drainage System Connectivity in a Subglacial Hydrology Model |
title_fullStr |
Hydraulic Conductivity as a Proxy for Drainage System Connectivity in a Subglacial Hydrology Model |
title_full_unstemmed |
Hydraulic Conductivity as a Proxy for Drainage System Connectivity in a Subglacial Hydrology Model |
title_sort |
hydraulic conductivity as a proxy for drainage system connectivity in a subglacial hydrology model |
publisher |
University of Montana |
publishDate |
2016 |
url |
https://scholarworks.umt.edu/etd/10877 https://scholarworks.umt.edu/context/etd/article/11923/viewcontent/Downs_Jacob_Thesis.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Graduate Student Theses, Dissertations, & Professional Papers |
op_relation |
https://scholarworks.umt.edu/etd/10877 https://scholarworks.umt.edu/context/etd/article/11923/viewcontent/Downs_Jacob_Thesis.pdf |
_version_ |
1771546061153763328 |