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A numerical investigation of surface crevasse propagation in glaciers using nonlocal continuum damage mechanics
Author(s) -
Duddu R.,
Bassis J. N.,
Waisman H.
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/grl.50602
Subject(s) - crevasse , geology , ice calving , glacier , ice shelf , geomorphology , seawater , ice stream , sea ice , oceanography , cryosphere , pregnancy , lactation , biology , genetics
We use a nonlocal viscoelastic damage model to investigate the conditions that enable water‐free surface crevasse propagation in grounded marine‐terminating glaciers. Our simulations, on idealized rectangular ice slabs in contact with the ocean, show that crevasses propagate faster in thicker ice slabs. We find that: (1) the fraction of ice slab thickness penetrated by surface crevasses decreases with increasing seawater depth near the terminus; (2) a no‐slip (fixed) basal boundary condition retards crevasse growth; and (3) crevasses form closer to the terminus when the seawater depth is larger or when the glacier base is fixed to the bedrock, which could lead to calving of smaller icebergs. However, water‐free surface crevasses can penetrate (nearly) the entire ice thickness only in thicker ice slabs terminating in shallow seawater depths. This leads us to the conclusion that surface crevasses alone are not responsible for calving events in marine‐terminating and thin glaciers.