Transmission of stress between an ice stream and interstream ridge

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Issue Date
2001-06-01Author
Whillans, I. M.
van der Veen, Cornelis J.
Publisher
International Glaciological Society
Type
Article
Article Version
Scholarly/refereed, publisher version
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Show full item recordAbstract
Measurements of strain rate are used to describe the stress distribution at the lateral margin of an active West Antarctic ice stream. The goal is to describe the way in which drag at the sides operates to control the motion of this ice stream. The problem is inherently complex, but with some approximations a mainly analytic solution is obtained. Allowing for spatially varying ice strength shows that the shear strain rate decreases over a larger distance from the ice stream than for ice of uniform strength. The simplest explanation using the results of field measurements is that the upper 40% of the ice stream is able to support lateral stress. For the slow-moving interstream ridge, rather more of the thickness is strong. The lateral shear stress from the ice stream is transferred to a basal zone about 3 km wide where basal drag reaches 60 kPa. This basal zone controls the speed of the ice stream.
Description
This is the published version, also available here: http://dx.doi.org/10.3189/172756501781832052.
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Citation
Whillans, I.M.; van der Veen, C.J. "Transmission of stress between an ice stream and interstream ridge." Journal of Glaciology, Volume 47, Number 158, June 2001, pp. 433-440(8). http://dx.doi.org/10.3189/172756501781832052.
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