Modelling the three-dimensional, diagnostic anisotropy field of an ice rise ...

• Main Authors: Henry, A. Clara J., Martín, Carlos, Drews, Reinhard
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: arXiv 2024
• Subjects: Fluid Dynamics physics.flu-dyn; Geophysics physics.geo-ph; FOS: Physical sciences; Ice Shelf
• Online Access: https://dx.doi.org/10.48550/arxiv.2408.01069; https://arxiv.org/abs/2408.01069

Polar ice develops anisotropic crystal orientation fabrics under deformation, yet ice is most often modelled as an isotropic fluid. We present three-dimensional simulations of the crystal orientation fabric of Derwael Ice Rise including the surrounding ice shelf using a crystal orientation tensor evolution equation corresponding to a fixed velocity field. We use a semi-Lagrangian numerical method that constrains the degree of crystal orientation evolution to solve the equations in complex flow areas. We perform four simulations based on previous studies, altering the rate of evolution of the crystal anisotropy and its dependence on a combination of the strain rate and deviatoric stress tensors. We provide a framework for comparison with radar observations of the anisotropy field, outlining areas where the assumption of one vertical eigenvector may not hold and provide resulting errors in measured eigenvalues. We recognise the areas of high horizontal divergence at the ends of the flow divide as important ...