Author(s): Daniel Feltham; Peter Sammonds; Daniel Hatton

Linked Author(s):

Keywords: No Keywords

Abstract: We present a methodology that allows a sea ice rheology, suitable for use in a General Circulation Model (GCM), to be determined from laboratory and tank experiments on sea ice when combined with a kinematic model of deformation. The laboratory experiments determine a material rheology for sea ice, and would investigate a nonlinear friction law of the formτ∝σ, instead of the more familiar Amonton's law, τ=uσ (τis the shear stress, uis the coefficient of friction andσ is the normal stress). The modelling approach considers a representative region R containing ice floes (or floe aggregates), separated by flaws. The deformation of R is imposed and the motion of the floes determined using a kinematic model, which will be motivated from SAR observations. Deformation of the flaws is inferred from the floe motion and stress determined from the material rheology. The stress over R is then determined from the area-weighted contribution from flaws and floes.

DOI:

Year: 2002