The subglacial hydraulics of the surge-type Black Rapids Glacier, Alaska: a schematic model
Thesis (M.S.) University of Alaska Fairbanks, 1995 The subglacial hydraulic system of the surge-type Black Rapids Glacier was studied in 1993 by comparing glacier velocity and seismicity with the stage, electrical conductivity, and turbidity of its proglacial streams. Brief events of increased veloc...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/6084 2023-05-15T16:20:14+02:00 The subglacial hydraulics of the surge-type Black Rapids Glacier, Alaska: a schematic model Cochran, Oakley D. Harrison, William Weeks, Wilford Kane, Douglas Echelmeyer, Keith Benson, Carl 1995-12 http://hdl.handle.net/11122/6084 en_US eng http://hdl.handle.net/11122/6084 Glaciers Alaska Surging glaciers Black Rapids Glacier (Alaska) Thesis ms 1995 ftunivalaska 2023-04-06T17:53:19Z Thesis (M.S.) University of Alaska Fairbanks, 1995 The subglacial hydraulic system of the surge-type Black Rapids Glacier was studied in 1993 by comparing glacier velocity and seismicity with the stage, electrical conductivity, and turbidity of its proglacial streams. Brief events of increased velocity and seismicity occurred at the beginning and end of the measurement season. Five events coincided with drainages of supraglacial lakes and potholes. During events, water was stored englacially or subglacially and released subsequently, as indicated by a dye tracing experiment. Conductivity-stage-seismicity relationships suggest a model wherein daily storage and release of water depended on variations in subglacial pressure, which were reflected by daily variations in seismicity. Heavy precipitation and increases in stage preceded late-season pothole drainages. We hypothesize that precipitation triggered pothole drainages by enlarging drainage conduits, thus lowering subglacial pressure. Differences between the drainage systems in 1993 and 1986-89 may reflect mechanisms of surge evolution. Thesis glacier glaciers Alaska University of Alaska: ScholarWorks@UA Fairbanks |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Glaciers Alaska Surging glaciers Black Rapids Glacier (Alaska) |
spellingShingle |
Glaciers Alaska Surging glaciers Black Rapids Glacier (Alaska) Cochran, Oakley D. The subglacial hydraulics of the surge-type Black Rapids Glacier, Alaska: a schematic model |
topic_facet |
Glaciers Alaska Surging glaciers Black Rapids Glacier (Alaska) |
description |
Thesis (M.S.) University of Alaska Fairbanks, 1995 The subglacial hydraulic system of the surge-type Black Rapids Glacier was studied in 1993 by comparing glacier velocity and seismicity with the stage, electrical conductivity, and turbidity of its proglacial streams. Brief events of increased velocity and seismicity occurred at the beginning and end of the measurement season. Five events coincided with drainages of supraglacial lakes and potholes. During events, water was stored englacially or subglacially and released subsequently, as indicated by a dye tracing experiment. Conductivity-stage-seismicity relationships suggest a model wherein daily storage and release of water depended on variations in subglacial pressure, which were reflected by daily variations in seismicity. Heavy precipitation and increases in stage preceded late-season pothole drainages. We hypothesize that precipitation triggered pothole drainages by enlarging drainage conduits, thus lowering subglacial pressure. Differences between the drainage systems in 1993 and 1986-89 may reflect mechanisms of surge evolution. |
author2 |
Harrison, William Weeks, Wilford Kane, Douglas Echelmeyer, Keith Benson, Carl |
format |
Thesis |
author |
Cochran, Oakley D. |
author_facet |
Cochran, Oakley D. |
author_sort |
Cochran, Oakley D. |
title |
The subglacial hydraulics of the surge-type Black Rapids Glacier, Alaska: a schematic model |
title_short |
The subglacial hydraulics of the surge-type Black Rapids Glacier, Alaska: a schematic model |
title_full |
The subglacial hydraulics of the surge-type Black Rapids Glacier, Alaska: a schematic model |
title_fullStr |
The subglacial hydraulics of the surge-type Black Rapids Glacier, Alaska: a schematic model |
title_full_unstemmed |
The subglacial hydraulics of the surge-type Black Rapids Glacier, Alaska: a schematic model |
title_sort |
subglacial hydraulics of the surge-type black rapids glacier, alaska: a schematic model |
publishDate |
1995 |
url |
http://hdl.handle.net/11122/6084 |
geographic |
Fairbanks |
geographic_facet |
Fairbanks |
genre |
glacier glaciers Alaska |
genre_facet |
glacier glaciers Alaska |
op_relation |
http://hdl.handle.net/11122/6084 |
_version_ |
1766007995239497728 |