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Investigating the ratio of basal drag and driving stress in relation to bedrock topography during a melt season on Storglaciaren, Sweden, using force-budget analysis
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2003 (English)In: ANNALS OF GLACIOLOGY, VOL 37, Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden. Univ Stockholm, Dept Phys Geog & Quaternary Geol, S-10691 Stockholm, Sweden., 2003, 263-268 p.Conference paper, Published paper (Refereed)
Abstract [en]

We apply the force-budget technique using the isothermal block-flow model, on Storglaciaren, Sweden, to investigate the ratio between basal drag and driving stress in relation to a bedrock ridge in the bed topography during a peak melt season. The input data consist of glacier surface velocities collected using differential global positioning system surveying of a stake net and geometry from previous radar soundings and digitized ice surface maps. The study focuses on the effects of transverse bedrock ridges upon basal stress conditions. The pattern of the calculated ratio of basal drag and driving stress shows a rhythmical position of relatively high and low basal drags on the stoss and lee sides, respectively, of the bedrock thresholds. One of the zones of low basal drag corresponds to the location where the highest basal sliding rate has been measured previously by borehode deformation studies. This zone also aligns with the area where the drainage system is suggested to change from englacial to subglacial.

Place, publisher, year, edition, pages
Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden. Univ Stockholm, Dept Phys Geog & Quaternary Geol, S-10691 Stockholm, Sweden., 2003. 263-268 p.
Series
ANNALS OF GLACIOLOGY, ISSN 0260-3055 ; 37
Research subject
SWEDARCTIC
Identifiers
URN: urn:nbn:se:polar:diva-2437DOI: 10.3189/172756403781815861ISI: 000189450700041ISBN: 0-946417-32-6 (print)OAI: oai:DiVA.org:polar-2437DiVA: diva2:883541
Conference
International Symposium on Physical and Mechanical Processes om Ice in Relation to Glacier and Ice-Sheet Modelling, AUG 25-30, 2002, Chamonix, FRANCE
Available from: 2015-12-17 Created: 2015-10-07 Last updated: 2015-12-17

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Jansson, P

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf