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Fabric development and rheology of polar anisotropic ice for ice sheet flow modelling.

Cel


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.

Zaproszenie do składania wniosków

Data not available

System finansowania

CSC - Cost-sharing contracts

Koordynator

UNIVERSITY OF EAST ANGLIA
Wkład UE
Brak danych
Adres
University Plain
NORWICH
Zjednoczone Królestwo

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Uczestnicy (4)