Elmer/Ice News

Elmer/Ice at AGU 2014

aguDon't miss the 8 presentations using Elmer/Ice at the next AGU!

C44B-02 First-principles Simulations and the Criticality of Calving Glaciers
Thursday, December 18, 2014, 04:15 PM - 04:30 PM , Moscone West-3007

C44B-03 Melt Undercutting and Calving from Tidewater Glaciers: Observations and Model Results
Thursday, December 18, 2014, 04:30 PM - 04:45 PM , Moscone West-3007

C23C-0416 Interpreting Terminus Fluctuations at Helheim Glacier, Southeast Greenland, through Modeling and Observations
Tuesday, December 16, 2014, 01:40 PM - 06:00 PM , Moscone West-Poster Hall

C23C-0417 Modeling Ocean-Forced Changes in Smith Glacier
Tuesday, December 16, 2014, 01:40 PM - 06:00 PM , Moscone West-Poster Hall

C33A-0351 Retroactions Between Basal Hydrology and Basal Sliding from Numerical Experiments
Wednesday, December 17, 2014, 01:40 PM - 06:00 PM , Moscone West-Poster Hall

C33A-0360 Inferring basal stress under Greenland's big three outlet glaciers
Wednesday, December 17, 2014, 01:40 PM - 06:00 PM , Moscone West-Poster Hall

C33A-0363 Comparison of Full Stokes and Shallow Shelf equations regarding grounding line dynamics on a variety of synthetic geometry representative of Antarctic outlet glaciers.
Wednesday, December 17, 2014, 01:40 PM - 06:00 PM , Moscone West-Poster Hall

C33A-0374 Investigating the Geometry and Conditions for Basal Accretion of Englacial Plumes
Wednesday, December 17, 2014, 01:40 PM - 06:00 PM , Moscone West-Poster Hall

Termini of calving glaciers as self-organized critical systems

Elmer CalvingThis article focuses on the discrete nature of calving and the understanding of the process itself. Based on calving data reaching from small events on glaciers up to the size of ice-shelves, the authors give strong arguments that calving fronts behave as self-organized critical systems that switch from sub-critical stable to super-critical Sfig6c smallcalving modes. The paper also includes a preliminary example on how such a discrete model that was used to underline the argument above could be coupled to Elmer/Ice in order to switch between continuum models in the sub-critical stage to the particle model in the super-critical mode in order to more realistically represent calving compared to continuum models.

 

Åström, J.A., D. Vallot, M. Schäfer, E.Z. Welty, S. O’Neel, T.C. Bartholomaus,Yan Liu, T.I. Riikilä, T. Zwinger, J. Timonen, and J.C. Moore, 2014. Termini of calving glaciers as self-organized critical systems, Nature Geoscience, 7, 874-878, doi:10.1038/ngeo2290 [link to paper]

A new calving model in Elmer/Ice

krug2014

Calving of icebergs is a major negative component of polar ice-sheet mass balance. Here we present a new calving model relying on both continuum damage mechanics and linear elastic fracture mechanics. This combination accounts for both the slow sub-critical surface crevassing and the rapid propagation of crevasses when calving occurs. First, damage to the ice occurs over long timescales and enhances the viscous flow of ice. Then brittle fractures propagate downward, at very short timescales, when the ice body is considered as an elastic medium. The model was calibrated on Helheim Glacier, Southeast Greenland, a well-monitored glacier with fast-flowing outlet. This made it possible to identify sets of model parameters to enable a consistent response of the model and to produce a dynamic equilibrium in agreement with the observed stable position of the Helheim ice front between 1930 and today.

Krug, J., J. Weiss, O. Gagliardini and G. Durand, 2014. Combining damage and fracture mechanics to model calving, The Cryosphere, 8, 2101-2117, doi:10.5194/tc-8-2101-2014 [link to paper]

Elmer/Ice project © 2018 -- Conception : iGrafic