Formulation of ice shelf dynamic boundary conditions in terms of a Coulomb rheology
1986; American Geophysical Union; Volume: 91; Issue: B8 Linguagem: Inglês
10.1029/jb091ib08p08177
ISSN2156-2202
AutoresDouglas R. MacAyeal, Sion Shabtaie, Charles R. Bentley, Scott D. King,
Tópico(s)Winter Sports Injuries and Performance
ResumoCoastal boundaries where fast flowing ice shelves shear past stagnant, grounded ice are typically riven with surface crevasses, seawater‐filled basal crevasses, and tidal strand cracks. Here we formulate a boundary condition describing stress transmission through these fractured boundaries in terms of the Coulomb law. As a result of this formulation, agreement between finite element simulations of the Ross Ice Shelf flow and field observations is improved over agreement obtained with formulations which do not account for ice failure. Our results additionally suggest that shear stress transmitted through ice shelf boundaries is lower than previously thought.
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