A model of basal hydrologic networks and effective stress beneath an ice sheet
Subglacial processes that control the water pressure and flow determine the large-scale behavior of the overlying ice by regulating basal resistance. We implement a model in which a steady-state subglacial conduit system is surrounded by fully-saturated porous media. We investigate branching in this...
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University of Oregon
2012
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ftproquest:oai:pqdtoai.proquest.com:1508948 2023-05-15T16:40:54+02:00 A model of basal hydrologic networks and effective stress beneath an ice sheet Papamarcos, Sara Sabrina 2012-01-01 00:00:01.0 http://pqdtopen.proquest.com/#viewpdf?dispub=1508948 ENG eng University of Oregon http://pqdtopen.proquest.com/#viewpdf?dispub=1508948 Geology|Geophysics thesis 2012 ftproquest 2021-03-13T17:35:38Z Subglacial processes that control the water pressure and flow determine the large-scale behavior of the overlying ice by regulating basal resistance. We implement a model in which a steady-state subglacial conduit system is surrounded by fully-saturated porous media. We investigate branching in this system at fixed angles of 15°, 30° and 45° to the direction of ice flow and further assess these systems by calculating the hydraulic potential gradient to determine conduit flow path. We solve our governing equations for porous media flow and allow ice infiltration of the pore space to occur at a critical effective stress Ninfiltration. For low values of Ninfiltration, ice infiltration of sediment allows these conduits to follow their original paths. Where insufficient ice infiltration occurs, the conduit path instead lies parallel to the direction of ice flow. Our results speak to the importance of incorporating small-scale processes into models of subglacial hydrologic networks. Thesis Ice Sheet PQDT Open: Open Access Dissertations and Theses (ProQuest) |
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Open Polar |
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PQDT Open: Open Access Dissertations and Theses (ProQuest) |
op_collection_id |
ftproquest |
language |
English |
topic |
Geology|Geophysics |
spellingShingle |
Geology|Geophysics Papamarcos, Sara Sabrina A model of basal hydrologic networks and effective stress beneath an ice sheet |
topic_facet |
Geology|Geophysics |
description |
Subglacial processes that control the water pressure and flow determine the large-scale behavior of the overlying ice by regulating basal resistance. We implement a model in which a steady-state subglacial conduit system is surrounded by fully-saturated porous media. We investigate branching in this system at fixed angles of 15°, 30° and 45° to the direction of ice flow and further assess these systems by calculating the hydraulic potential gradient to determine conduit flow path. We solve our governing equations for porous media flow and allow ice infiltration of the pore space to occur at a critical effective stress Ninfiltration. For low values of Ninfiltration, ice infiltration of sediment allows these conduits to follow their original paths. Where insufficient ice infiltration occurs, the conduit path instead lies parallel to the direction of ice flow. Our results speak to the importance of incorporating small-scale processes into models of subglacial hydrologic networks. |
format |
Thesis |
author |
Papamarcos, Sara Sabrina |
author_facet |
Papamarcos, Sara Sabrina |
author_sort |
Papamarcos, Sara Sabrina |
title |
A model of basal hydrologic networks and effective stress beneath an ice sheet |
title_short |
A model of basal hydrologic networks and effective stress beneath an ice sheet |
title_full |
A model of basal hydrologic networks and effective stress beneath an ice sheet |
title_fullStr |
A model of basal hydrologic networks and effective stress beneath an ice sheet |
title_full_unstemmed |
A model of basal hydrologic networks and effective stress beneath an ice sheet |
title_sort |
model of basal hydrologic networks and effective stress beneath an ice sheet |
publisher |
University of Oregon |
publishDate |
2012 |
url |
http://pqdtopen.proquest.com/#viewpdf?dispub=1508948 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
http://pqdtopen.proquest.com/#viewpdf?dispub=1508948 |
_version_ |
1766031322333052928 |