Orateur
Pierre SARAMITO
Description
This paper presents a first implementation of a new rheological model for sea ice on geophysical scales. The continuum model [1,2] is based on coupling between a progressive **damage** mechanism, with a Mohr-Coulomb **yield stress** damage criterion and a Maxwell **viscoelastic** constitutive equation. The model is tested on the basis of its capability to reproduce the complex mechanical and dynamical behavior of sea ice drifting through a narrow passage.
Idealized as well as realistic simulations of the flow of ice through Nares Strait are presented. These demonstrate that the model reproduces the formation of stable ice bridges as well as the stoppage of the flow, a phenomenon occurring within numerous channels of the Arctic. In agreement with observations, the model captures the propagation of damage along narrow arch-like kinematic features, the discontinuities in the velocity field across these features dividing the ice cover into floes, the strong spatial localization of the thickest, ridged ice, the presence of landfast ice in bays and fjords and the opening of polynyas downstream of the strait.
[1] V. Dansereau, J. Weiss, P. Saramito, P. Lattes and E. Coche. Ice bridges
and ridges in the Maxwell-EB sea ice rheology. Cryosphere, 2017
[2] V. Dansereau, J. Weiss, P. Saramito and P. Lattes. A Maxwell-elasto-brittle
rheology for sea ice modelling. Cryosphere, 2016.
Auteur principal
Co-auteurs
M.
Jérome Weiss
(Isterre, CNRS and univ. Grenoble, France)
Mme
Véronique Danseau
(Isterre, CNRS and Univ. Grenoble, France)
