THE BOTTOM TOPOGRAPHY OF GULKANA GLACIER, ALASKA RANGE, ALASKA
As an extension of an intensive study of Gulkana Glacier a 42 station gravimeter survey was made to gain some insight into its third dimension. This survey showed that the glacier's main tongue occupies a complex valley composed essentially of two parallel channels separated by a medial ridge w...
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ftdtic:AD0622721 2023-05-15T13:09:43+02:00 THE BOTTOM TOPOGRAPHY OF GULKANA GLACIER, ALASKA RANGE, ALASKA OSTENSO,N. A. Sellmann,P. V. Pewe,T. L. WISCONSIN UNIV MADISON GEOPHYSICAL AND POLAR RESEARCH CENTER 1964-11-18 text/html http://www.dtic.mil/docs/citations/AD0622721 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0622721 en eng http://www.dtic.mil/docs/citations/AD0622721 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS *GLACIERS ALASKA ICE CONFIGURATIONS MOTION Text 1964 ftdtic 2016-02-21T21:44:40Z As an extension of an intensive study of Gulkana Glacier a 42 station gravimeter survey was made to gain some insight into its third dimension. This survey showed that the glacier's main tongue occupies a complex valley composed essentially of two parallel channels separated by a medial ridge which extends southward from rock bastions in the accumulation zone. At midglacier the ice thickness in the larger eastern channel is 225 m., in contrast to 130 m. in the western channel. The medial ridge degenerates down-glacier probably disappearing within 2 km. of the glacier terminus. The basic surface flow pattern of the glacier described by Moores can be adequately explained by this basal topography. Seasonal velocity variations are possibly caused by melt-water basal lubrication with one channel being favored over the other at different times of the year, in agreement with observations by Elliston on the Gorner-Gletscher, Switzerland, and with the glacier sliding theory of Weertman. (Author) Pub. in Journal of Glaciology, v5 n41 p651-60 Jun 1965. (Copies available only to DDC users). Prepared in cooperation with Army Cold Regions Research and Engineering Lab., Hanover, N. H. and Alaska Univ., College. Dept. of Geology. Text alaska range glacier glaciers Alaska Defense Technical Information Center: DTIC Technical Reports database Weertman ENVELOPE(-67.753,-67.753,-66.972,-66.972) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
*GLACIERS ALASKA ICE CONFIGURATIONS MOTION |
spellingShingle |
*GLACIERS ALASKA ICE CONFIGURATIONS MOTION OSTENSO,N. A. Sellmann,P. V. Pewe,T. L. THE BOTTOM TOPOGRAPHY OF GULKANA GLACIER, ALASKA RANGE, ALASKA |
topic_facet |
*GLACIERS ALASKA ICE CONFIGURATIONS MOTION |
description |
As an extension of an intensive study of Gulkana Glacier a 42 station gravimeter survey was made to gain some insight into its third dimension. This survey showed that the glacier's main tongue occupies a complex valley composed essentially of two parallel channels separated by a medial ridge which extends southward from rock bastions in the accumulation zone. At midglacier the ice thickness in the larger eastern channel is 225 m., in contrast to 130 m. in the western channel. The medial ridge degenerates down-glacier probably disappearing within 2 km. of the glacier terminus. The basic surface flow pattern of the glacier described by Moores can be adequately explained by this basal topography. Seasonal velocity variations are possibly caused by melt-water basal lubrication with one channel being favored over the other at different times of the year, in agreement with observations by Elliston on the Gorner-Gletscher, Switzerland, and with the glacier sliding theory of Weertman. (Author) Pub. in Journal of Glaciology, v5 n41 p651-60 Jun 1965. (Copies available only to DDC users). Prepared in cooperation with Army Cold Regions Research and Engineering Lab., Hanover, N. H. and Alaska Univ., College. Dept. of Geology. |
author2 |
WISCONSIN UNIV MADISON GEOPHYSICAL AND POLAR RESEARCH CENTER |
format |
Text |
author |
OSTENSO,N. A. Sellmann,P. V. Pewe,T. L. |
author_facet |
OSTENSO,N. A. Sellmann,P. V. Pewe,T. L. |
author_sort |
OSTENSO,N. A. |
title |
THE BOTTOM TOPOGRAPHY OF GULKANA GLACIER, ALASKA RANGE, ALASKA |
title_short |
THE BOTTOM TOPOGRAPHY OF GULKANA GLACIER, ALASKA RANGE, ALASKA |
title_full |
THE BOTTOM TOPOGRAPHY OF GULKANA GLACIER, ALASKA RANGE, ALASKA |
title_fullStr |
THE BOTTOM TOPOGRAPHY OF GULKANA GLACIER, ALASKA RANGE, ALASKA |
title_full_unstemmed |
THE BOTTOM TOPOGRAPHY OF GULKANA GLACIER, ALASKA RANGE, ALASKA |
title_sort |
bottom topography of gulkana glacier, alaska range, alaska |
publishDate |
1964 |
url |
http://www.dtic.mil/docs/citations/AD0622721 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0622721 |
long_lat |
ENVELOPE(-67.753,-67.753,-66.972,-66.972) |
geographic |
Weertman |
geographic_facet |
Weertman |
genre |
alaska range glacier glaciers Alaska |
genre_facet |
alaska range glacier glaciers Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0622721 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766196053593292800 |