# SEA ICE TALK: FLOE-SCALE RIDGING IN DISCRETE ELEMENT MODELS FOR SEA ICE
Below is my recorded talk for an upcoming workshop on modeling the
granular nature of sea ice[1] The workshop is online, and will take
place in the week of June 7th, 2021. Full abstract:
Title: Floe-scale ridging in discrete element models for sea ice
Anders Damsgaard(1,2), Olga V. Sergienko(1), Alistair Adcroft(1)
1: Program in Atmospheric and Oceanic Sciences, Princeton University,
New Jersey, USA
2: Department of Geoscience, Aarhus University, Aarhus, Denmark
Ridging and rafting through compression and shear increase the
thickness and therefore also the melt resilience of sea-ice packs.
Present formulations for these mechanisms assume that ice strength is
solely governed by ice thickness, and generally treat the ice pack as
a continuum where each cell in the spatial discretization includes
many individual ice floes. Particle-based sea ice models with
granular interactions generally represent the ice on a floe-by-floe
basis, meaning that new formulations are required for including
ridging. We show through small-scale, high-resolution Discrete
Element Method simulations that floe-floe compression encompasses
different deformational modes, where elasticity transitions to
frictional sliding and resultant strain weakening at the onset of
ridging. We present a generalized formulation based on elasticity
and Coulomb friction which is suitable for simulating the contact
mechanics of ridging in particle-based sea ice models. On a larger
scale, this results in ice-pack dynamics prone to stick-slip, strain
localization, and limited compressional resistance.
Slides and video:
- slides:
gopher://adamsgaard.dk/9/npub/seaicemuri2021-damsgaard.pdf
- video:
https://adamsgaard.dk/video/seaicemuri_damsgaard.mp4
Several other presentations to the workshop are also already available[2].
References:
[1]
https://seaicemuri.org
[2]
https://seaicemuri.org/presentations.html
