# 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