Objective To construct a new Reduced Model - a system of partial differential equations - which describes the dominant thermomechanical balances governing the flow of a large ice sheet, which incorporates the anisotropy induced by the evolution of fabric (realignments of crystal axes) as ice descends to depth. Samples from deep ice cores will be examined to establish the distinct shear responses on planes at different inclinations, and deduce the dominant shear planes and their normal axes. Numerical simulation of the deformation of a polycrystal aggregate with initially random distribution of axes will be performed to observe the evolution of axes realignments, and infer dependence on stress and deformation. Frame indifferent constitutive laws, which incorporate structure evolution to model observed behaviour, will be constructed. Within the project the new laws will be incorporated into the mass, momentum and energy balance of a gravity driven ice sheet flow, and investigation of simplifications achieved by co-ordinate stretching to reflect the large aspect ratios will be done. The reduced models will be applied to idealised flows to illustrate the effects of fabric, and to specific examples of current ice sheet configurations. Fields of science natural sciencesmathematicspure mathematicsmathematical analysisdifferential equationspartial differential equationssocial scienceslaw Programme(s) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Topic(s) 010102 - The climate system in the past Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator UNIVERSITY OF EAST ANGLIA EU contribution No data Address University Plain NORWICH United Kingdom See on map Links Website Opens in new window Total cost No data Participants (4) Sort alphabetically Sort by EU Contribution Expand all Collapse all CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE France EU contribution No data Address Rue Molière 54, Université de Grenoble 1 38402 SAINT-MARTIN-D'HERES See on map Total cost No data Centre National de la Recherche Scientifique France EU contribution No data Address 14 avenue Edouard Belin 31400 Toulouse See on map Total cost No data NERC British Antarctic Survey United Kingdom EU contribution No data Address High Cross Madingley Road CB3 0ET Cambridge See on map Total cost No data Technische Hochschule Darmstadt Germany EU contribution No data Address 1,Hochschulstrasse 64289 Darmstadt See on map Total cost No data