Journal ArticleDOI
Flexure of a Floating Ice Tongue
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In this paper, several analyses are given for the flexure of a floating polar ice tongue with the general dimensions of several kilometers wide by 200 in in thickness, and the lengths considered are from 2 km to in excess of 10 km, referred to as a long slab.Abstract:
Several analyses are given for the flexure of a floating polar ice tongue with the general dimensions of several kilometers wide by 200 in in thickness The lengths considered are from 2 km to in excess of 10 km which is referred to as a long slab The analyses are made under the separate assumptions that ice behaves as (1) an elastic material, (2) an elastic-plastic material, and (3) a fully plastic material, when reacting to flexure due to changes in sea-level The elastic analysis shows that hinge-line stresses could become very high of the order of 15 bar) for slab lengths up to about 3·5 km reacting to sea-level changes of the order of ±50 cm For slab lengths greater than this, the stresses at the hinge, as well as being significantly less than before, become independent of the length of the slab, dependent only on the slab thickness and the amount of deflection of sea-level In the elastic-plastic analysis, the hinge-line stress cannot exceed a value of about 2 bar This yield value is reached when sea-level departs about 50 cm from the mean The fully plastic analysis requires more accurate knowledge of the constants in the flow law and their variation with density, temperature and salinity within the ice However, the theory may be tested by measuring the diurnal change in strain-rate across the hinge-line zone The process of calving of large tabular icebergs from such glacier tongues may demand sea-level changes of more than ± 1 m, or bending about more than one axis of the shelfread more
Citations
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Calving processes and the dynamics of calving glaciers
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West Antarctic Ice Streams
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Tidal flexure at ice shelf margins
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Journal ArticleDOI
Ocean access to a cavity beneath Totten Glacier in East Antarctica
Jamin S. Greenbaum,Donald D. Blankenship,Duncan A. Young,Thomas G. Richter,Jason L. Roberts,Jason L. Roberts,Alan Aitken,Benoit Legresy,Benoit Legresy,Benoit Legresy,Dustin M. Schroeder,Roland C. Warner,Roland C. Warner,T. D. van Ommen,T. D. van Ommen,Martin J. Siegert +15 more
TL;DR: A derivation of the sea floor bathymetry reveals entrances to the ice cavity beneath the Totten Glacier that could allow deep warm water to enter and enhance basal melting as mentioned in this paper.
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The West Antarctic Ice Sheet: Instability, disintegration, and initiation of Ice Ages
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References
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Journal ArticleDOI
The creep of polycrystalline ice
TL;DR: In this article, the results of these tests are discussed in connexion with previous work on metals and ice, and also with measurements of glacier flow, showing that ice creeps in a manner similar to that shown by metals at high temperatures; there is a transient creep component and also a continuing or quasi-viscous component.
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The Flow of Glaciers and Ice-Sheets as a Problem in Plasticity
TL;DR: In this paper, the distribution of stress and velocity in an ideal glacier and an ideal ice-sheet is calculated for the two-dimensional flow of a long slab of ice down a gently undulating rough slope.
Journal ArticleDOI
Deformation of Floating Ice Shelves
TL;DR: In this article, the problem of the creep deformation of floating ice shelves is considered and the problem is solved using Glen's creep law for ice and Nye's relation of steady-state creep (the analogue of the Levy-Miles relation in plasticity theory).
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On the calving of ice from floating glaciers and ice shelves
TL;DR: In this article, the deformation and the state of stress in the frontal part of a floating glacier are analyzed by a method analogous with the beam theory, applied in engineering practice for determining stresses and deflections of a beans of an elastic material.