Results 31 to 40 of about 4,984 (254)

Modelling ice mélange based on the viscous-plastic sea-ice rheology

, 2023
Abstract. Ice mélange, which is a mixture of sea ice, bergy bits and icebergs, can have a strong influence on the sea-ice–ocean interaction. So far, ice mélange is not represented in climate models as numerically efficient realizations are missing. This motivates the development of an ice-mélange model based on the viscous-plastic sea-ice rheology ...
Saskia Kahl, Carolin Mehlmann, Dirk Notz
openaire   +2 more sources

Sediment behavior controls equilibrium width of subglacial channels

Journal of Glaciology, 2017
Flow-frictional resistance at the base of glaciers and ice sheets is strongly linked to subglacial water pressure. Understanding the physical mechanisms that govern meltwater fluxes in subglacial channels is hence critical for constraining variations in ...
ANDERS DAMSGAARD, JENNY SUCKALE, JAN A. PIOTROWSKI, MORGANE HOUSSAIS, MATTHEW R. SIEGFRIED, HELEN A. FRICKER   +5 more
doaj   +1 more source

Effect of an orientation-dependent non-linear grain fluidity on bulk directional enhancement factors

Journal of Glaciology, 2021
Bulk directional enhancement factors are determined for axisymmetric (girdle and single-maximum) orientation fabrics using a transversely isotropic grain rheology with an orientation-dependent non-linear grain fluidity.
Nicholas M. Rathmann, Christine S. Hvidberg, Aslak Grinsted, David A. Lilien, Dorthe Dahl-Jensen   +4 more
doaj   +1 more source

On the physical basis for the creep of ice: the high temperature regime

Journal of Glaciology, 2020
This work quantifies the increased temperature sensitivity of the constitutive behavior of ice with proximity to the melting point in terms of dislocation mechanics.
D.M. Cole
doaj   +1 more source

Shallow upper mantle rheology and secular ice sheet fluctuations [PDF]

Tectonophysics, 2011
On time scales from decades to centuries, continental cryospheric forcing in response to climate change constitutes a major source of isostatic disequilibrium that may influence future regional sea level variations. Current vertical displacements and gravity field variations are often estimated neglecting rheological effects and thus assuming a fully ...
Spada, G., F. Colleoni, and G. Ruggieri
openaire   +2 more sources

Rheology of Discrete Failure Regimes of Anisotropic Sea Ice [PDF]

Journal of Physical Oceanography, 2012
ABSTRACT A rheological model of sea ice is presented that incorporates the orientational distribution of ice thickness in leads embedded in isotropic floe ice. Sea ice internal stress is determined by coulombic, ridging and tensile failure at orientations where corresponding failure criteria are satisfied at minimum stresses. Because sea
Wilchinsky, Alexander V., Feltham, Daniel L.   +1 more
openaire   +1 more source

Strengthening of columnar-grained freshwater ice through cyclic flexural loading

Journal of Glaciology, 2020
Systematic experiments reveal that the flexural strength of freshwater S2 columnar-grained ice loaded normal to the columns increases upon cyclic loading.
Andrii Murdza, Erland M. Schulson, Carl E. Renshaw   +2 more
doaj   +1 more source

Rheology of an Ice-Floe Field [PDF]

Annals of Glaciology, 1984
The aim of the paper is (1) to develop theory to describe sea ice as a collection of finite-sized floes and (2) to construct a rheology based on this description.Successful sea-ice models have considered the ice to be a two-dimensional continuum with a nonlinear plastic rheology, a two-dimensional yield curve being used to determine the internal ice ...
openaire   +1 more source

A Maxwell elasto-brittle rheology for sea ice modelling [PDF]

The Cryosphere, 2016
Abstract. A new rheological model is developed that builds on an elasto-brittle (EB) framework used for sea ice and rock mechanics, with the intent of representing both the small elastic deformations associated with fracturing processes and the larger deformations occurring along the faults/leads once the material is highly damaged and fragmented.
Dansereau, Véronique, Weiss, Jérôme, Saramito, Pierre, Lattes, Philippe   +3 more
openaire   +5 more sources

Firn densification in two dimensions: modeling the collapse of snow caves and enhanced densification in ice-stream shear margins

Journal of Glaciology
Accurate modeling of firn densification is necessary for ice core interpretation and assessing the mass balance of glaciers and ice sheets. In this paper, we revisit the nonlinear-viscous firn rheology introduced by Gagliardini and Meyssonnier (1997 ...
Jon Arrizabalaga-Iriarte, Lide Lejonagoitia-Garmendia, Christine S. Hvidberg, Aslak Grinsted, Nicholas M. Rathmann   +4 more
doaj   +1 more source