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       t009-seaicemuri.txt (1996B)
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            1 Below is my recorded talk for an upcoming workshop on modeling the
            2 granular nature of sea ice[1] The workshop is online, and will take
            3 place in the week of June 7th, 2021.  Full abstract:
            4 
            5     Title: Floe-scale ridging in discrete element models for sea ice
            6 
            7     Anders Damsgaard(1,2), Olga V. Sergienko(1), Alistair Adcroft(1)
            8 
            9     1: Program in Atmospheric and Oceanic Sciences, Princeton University,
           10     New Jersey, USA
           11 
           12     2: Department of Geoscience, Aarhus University, Aarhus, Denmark
           13 
           14     Ridging and rafting through compression and shear increase the
           15     thickness and therefore also the melt resilience of sea-ice packs.
           16     Present formulations for these mechanisms assume that ice strength is
           17     solely governed by ice thickness, and generally treat the ice pack as
           18     a continuum where each cell in the spatial discretization includes
           19     many individual ice floes.  Particle-based sea ice models with
           20     granular interactions generally represent the ice on a floe-by-floe
           21     basis, meaning that new formulations are required for including
           22     ridging.  We show through small-scale, high-resolution Discrete
           23     Element Method simulations that floe-floe compression encompasses
           24     different deformational modes, where elasticity transitions to
           25     frictional sliding and resultant strain weakening at the onset of
           26     ridging.  We present a generalized formulation based on elasticity
           27     and Coulomb friction which is suitable for simulating the contact
           28     mechanics of ridging in particle-based sea ice models.  On a larger
           29     scale, this results in ice-pack dynamics prone to stick-slip, strain
           30     localization, and limited compressional resistance.
           31 
           32 Slides and video:
           33 
           34     - slides: gopher://adamsgaard.dk/9/npub/seaicemuri2021-damsgaard.pdf
           35     - video: https://adamsgaard.dk/video/seaicemuri_damsgaard.mp4
           36 
           37 Several other presentations to the workshop are also already available[2].
           38 
           39 
           40 References:
           41 [1] https://seaicemuri.org
           42 [2] https://seaicemuri.org/presentations.html