Results 261 to 270 of about 6,415 (289)

Stability of the Viscous-Plastic Sea Ice Rheology

Journal of Physical Oceanography, 1995
The large-scale two-dimensional theology of a sea ice pack arises from the local contact forces between ; adjacent floes in convergence. It is conventionally modeled by a viscous-plastic constitutive relation to reflect the low or zero stress in a divergent flow field and the rate-independent ridging process in convergence. The authors demonstrate how,
Gray, Nico; id_orcid 0000-0003-3554-0499, GRAY, JMNT, KILLWORTH, PD   +2 more
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A finite-element treatment of sea ice dynamics for different ice rheologies

International Journal for Numerical and Analytical Methods in Geomechanics, 1998
Summary: The effects of four different rheologies on the evolution of a large-scale sea ice pack are determined and compared. Two rheologies are of viscous-plastic form, and two are viscous fluid relations. The initial pack domain is rectangular, and the motion is driven by wind stress and resisted by ocean drag.
Schulkes, R. M.S.M., Morland, L. W., Staroszczyk, R.   +2 more
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Rheology of water ices V and VI

Journal of Geophysical Research: Solid Earth, 1996
We have measured the mechanical strength (σ) of pure water ices V and VI under steady state deformation conditions. Constant displacement rate compressional tests were conducted in a gas apparatus at confining pressures from 400 < P < 800 MPa, temperatures from 209 < T < 270 K, and strain rates 7 × 10−7 < < 7 × 10−4 s−1. Most of the
William B. Durham, Laura A. Stern, Stephen H. Kirby   +2 more
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Ice rheology and tidal heating of Enceladus

Icarus, 2013
Abstract For the saturnian satellite Enceladus, the possible existence of a global ocean is a major issue. For the stability of an internal ocean, tidal heating is suggested as an effective heat source. However, assuming Maxwell rheology ice, it has been shown that a global scale ocean on Enceladus cannot be maintained (Roberts, J.F., Nimmo, F. [2008]
D. Shoji, H. Hussmann, K. Kurita, F. Sohl   +3 more
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Sea ice rheology

2011
This chapter first explains the general concepts underlying the science of rheology. Then the usual drift ice rheology models are presented: viscous, plastic, and granular medium. There are two principal reasons for the inclusion of this chapter.
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The role of floe collisions in sea ice rheology

Journal of Geophysical Research: Oceans, 1987
A collisional rheology for an idealized two‐dimensional flow of a fragmented ice field is derived. This fragmented ice field is modeled as an assembly of identical smooth disks. Collisions between neighboring disks are caused by the mean deformation field.
Hayley H. Shen, William D. Hibler, Matti Leppäranta   +2 more
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Ice flow localisation enhanced by composite ice rheology&#160;

2021
&lt;p&gt;Ice&amp;#8217;s predominantly viscous rheology exhibits a significant temperature and strain-rate dependence, commonly captured as a single deformation mechanism by Glen's flow law. However, Glen&amp;#8217;s power-law relationship may fail to capture accurate stress levels at low and elevated strain-rates ultimately leading to ...
Ludovic Räss, Thibault Duretz
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An investigation of low‐stress ice rheology on the Ward‐Hunt Ice Shelf

Journal of Geophysical Research: Solid Earth, 1986
Deformation of the Ward‐Hunt Ice Shelf, Northwest Territories, Canada, can be used to study the rheology of ice in the low‐stress, low‐strain rate regime (10−12s−1). Finite element simulations are separately displayed to demonstrate what the effects of ice salinity, ice temperature, and sea‐ice back pressure have on the spreading rates of this ice ...
Douglas R. MacAyeal, G. Holdsworth
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Rheology of ices: a key to the tectonics of the ice moons of Jupiter and Saturn

Nature, 1982
The polymorphic varieties of water ice are important rock-forming minerals in the outer Solar System. The Voyager 1 and 2 missions have shown that most of the ice moons of Jupiter and Saturn have had some form of tectonic or internal activity. Understanding of the tectonics and building reasonable models of the interior of these planets depend on our ...
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A New Brittle Rheology and Numerical Framework for Large‐Scale Sea‐Ice Models

Journal of Advances in Modeling Earth Systems, 2022
Einar Olason, Guillaume Boutin, Anton Korosov   +2 more
exaly