Glacier Flow in a Curving Channel
Abstract 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 t...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1987
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0022143000008856 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008856 |
id |
crcambridgeupr:10.1017/s0022143000008856 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0022143000008856 2024-03-03T08:46:02+00:00 Glacier Flow in a Curving Channel Echelmeyer, Keith Barclay, Kamb 1987 http://dx.doi.org/10.1017/s0022143000008856 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008856 en eng Cambridge University Press (CUP) Journal of Glaciology volume 33, issue 115, page 281-292 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1987 crcambridgeupr https://doi.org/10.1017/s0022143000008856 2024-02-08T08:34:04Z Abstract 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. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Blue Glacier ENVELOPE(164.167,164.167,-77.833,-77.833) Journal of Glaciology 33 115 281 292 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Echelmeyer, Keith Barclay, Kamb Glacier Flow in a Curving Channel |
topic_facet |
Earth-Surface Processes |
description |
Abstract 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. |
format |
Article in Journal/Newspaper |
author |
Echelmeyer, Keith Barclay, Kamb |
author_facet |
Echelmeyer, Keith Barclay, Kamb |
author_sort |
Echelmeyer, Keith |
title |
Glacier Flow in a Curving Channel |
title_short |
Glacier Flow in a Curving Channel |
title_full |
Glacier Flow in a Curving Channel |
title_fullStr |
Glacier Flow in a Curving Channel |
title_full_unstemmed |
Glacier Flow in a Curving Channel |
title_sort |
glacier flow in a curving channel |
publisher |
Cambridge University Press (CUP) |
publishDate |
1987 |
url |
http://dx.doi.org/10.1017/s0022143000008856 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008856 |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) ENVELOPE(164.167,164.167,-77.833,-77.833) |
geographic |
Tilting Blue Glacier |
geographic_facet |
Tilting Blue Glacier |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 33, issue 115, page 281-292 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000008856 |
container_title |
Journal of Glaciology |
container_volume |
33 |
container_issue |
115 |
container_start_page |
281 |
op_container_end_page |
292 |
_version_ |
1792501847188045824 |