A particle based simulation model for glacier dynamics
Åström, J., Riikilä, T., Tallinen, T., Zwinger, T., Benn, D., Moore, J.C., & Timonen, J. (2013). A particle based simulation model for glacier dynamics. Cryosphere, 7(5), 1591-1602. https://doi.org/10.5194/tc-7-1591-2013
Julkaistu sarjassa
CryosphereTekijät
Benn, D. |
Päivämäärä
2013Tekijänoikeudet
© Author(s) 2013. This is an open access article distributed under the terms of Creative Commons Attribution 3.0 License
A particle-based computer simulation model was
developed for investigating the dynamics of glaciers. In the
model, large ice bodies are made of discrete elastic particles
which are bound together by massless elastic beams.
These beams can break, which induces brittle behaviour. At
loads below fracture, beams may also break and reform with
small probabilities to incorporate slowly deforming viscous
behaviour in the model. This model has the advantage that it
can simulate important physical processes such as ice calving
and fracturing in a more realistic way than traditional
continuum models. For benchmarking purposes the deformation
of an ice block on a slip-free surface was compared to
that of a similar block simulated with a Finite Element fullStokes
continuum model. Two simulations were performed:
(1) calving of an ice block partially supported in water, similar
to a grounded marine glacier terminus, and (2) fracturing
of an ice block on an inclined plane of varying basal friction,
which could represent transition to fast flow or surging.
Despite several approximations, including restriction to twodimensions
and simplified water-ice interaction, the model
was able to reproduce the size distributions of the debris observed
in calving, which may be approximated by universal
scaling laws. On a moderate slope, a large ice block was
stable and quiescent as long as there was enough of friction
against the substrate. For a critical length of frictional contact,
global sliding began, and the model block disintegrated
in a manner suggestive of a surging glacier. In this case the
fragment size distribution produced was typical of a grinding
process.
...
Julkaisija
Copernicus PublicationsISSN Hae Julkaisufoorumista
1994-0416Asiasanat
Alkuperäislähde
http://www.the-cryosphere.net/7/1591/2013/tc-7-1591-2013.pdfJulkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/23237209
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