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Glacier flow in a curving channel

Echelmeyer, Keith and Kamb, Barclay (1987) Glacier flow in a curving channel. Journal of Glaciology, 33 (115). pp. 281-292. ISSN 0022-1430.

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The flow of a glacier along a channel of constant longitudinal curvature is analyzed using analytical and finite-element methods. Channels of various cross-sectional shape are investigated, ranging from a simple rectangular form with zero shear traction along the bed to realistic profiles taken from Blue Glacier, Washington. Terms in the equilibrium and rate-of-deformation equations which are inversely dependent on radius and a body force which varies transversely across the glacier introduce several characteristic features into the stress and velocity fields of the curving glacier. The stress center line is shifted toward the inside of the bend, causing an asymmetric crevasse pattern and non-zero stress magnitude at the surface on the geometric center line of the channel. The stress field is dependent on the stress exponent in the flow law and is non-linear across the surface. The surface-velocity pattern shows a "tilting" of the usual high-order parabolic form, being skewed toward the inside of the bend. There is a shift in the velocity maximum from the deepest part of the channel. All of these curvature-induced features are dependent on the radius of curvature, actual channel geometry, and stress exponent in the flow law. Model results show excellent agreement with the velocity and crevasse patterns on the curving Blue Glacier.

Item Type:Article
Additional Information:© 1987 International Glaciological Society. MS. received 11 February 1987 and in revised form 23 March 1987. We thank the National Park Service, Olympic National Park, for permission to carry out the field study that acquired the Blue Glacier flow data reported here. The work was done under the support of National Science Foundation grants EAR 78-01715 and EAR 80-08319.
Funding AgencyGrant Number
NSFEAR 78-01715
NSFEAR 80-08319
Issue or Number:115
Record Number:CaltechAUTHORS:20140912-085734807
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49640
Deposited By: Tony Diaz
Deposited On:12 Sep 2014 23:56
Last Modified:03 Oct 2019 07:15

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