Objetivo 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. Ámbito científico natural sciencesmathematicspure mathematicsmathematical analysisdifferential equationspartial differential equationssocial scienceslaw Programa(s) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Tema(s) 010102 - The climate system in the past Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador UNIVERSITY OF EAST ANGLIA Aportación de la UE Sin datos Dirección University Plain NORWICH Reino Unido Ver en el mapa Enlaces Sitio web Opens in new window Coste total Sin datos Participantes (4) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Francia Aportación de la UE Sin datos Dirección Rue Molière 54, Université de Grenoble 1 38402 SAINT-MARTIN-D'HERES Ver en el mapa Coste total Sin datos Centre National de la Recherche Scientifique Francia Aportación de la UE Sin datos Dirección 14 avenue Edouard Belin 31400 Toulouse Ver en el mapa Coste total Sin datos NERC British Antarctic Survey Reino Unido Aportación de la UE Sin datos Dirección High Cross Madingley Road CB3 0ET Cambridge Ver en el mapa Coste total Sin datos Technische Hochschule Darmstadt Alemania Aportación de la UE Sin datos Dirección 1,Hochschulstrasse 64289 Darmstadt Ver en el mapa Coste total Sin datos