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       t009-seaicemuri.html (2168B)
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            1 <p> Below is my recorded talk for an upcoming workshop on <a
            2 href="https://seaicemuri.org">modeling the granular nature of sea ice</a>.
            3 The workshop is online, and will take place in the week of June 7th,
            4 2021.  Full abstract:</p>
            5 
            6 <blockquote>
            7 <b>Floe-scale ridging in discrete element models for sea ice</b>
            8 <br><br>
            9 Anders Damsgaard(1,2), Olga V. Sergienko(1), Alistair Adcroft(1)
           10 <br><br>
           11 1: Program in Atmospheric and Oceanic Sciences, Princeton University,
           12 New Jersey, USA
           13 <br>
           14 2: Department of Geoscience, Aarhus University, Aarhus, Denmark
           15 <br><br>
           16 Ridging and rafting through compression and shear increase the
           17 thickness and therefore also the melt resilience of sea-ice packs.
           18 Present formulations for these mechanisms assume that ice strength
           19 is solely governed by ice thickness, and generally treat the ice
           20 pack as a continuum where each cell in the spatial discretization
           21 includes many individual ice floes.  Particle-based sea ice models
           22 with granular interactions generally represent the ice on a
           23 floe-by-floe basis, meaning that new formulations are required for
           24 including ridging.  We show through small-scale, high-resolution
           25 Discrete Element Method simulations that floe-floe compression
           26 encompasses different deformational modes, where elasticity transitions
           27 to frictional sliding and resultant strain weakening at the onset
           28 of ridging.  We present a generalized formulation based on elasticity
           29 and Coulomb friction which is suitable for simulating the contact
           30 mechanics of ridging in particle-based sea ice models.  On a larger
           31 scale, this results in ice-pack dynamics prone to stick-slip, strain
           32 localization, and limited compressional resistance.</blockquote>
           33 
           34 <p>Slides and video:</p>
           35 
           36 <ul>
           37 <li><a href="npub/seaicemuri2021-damsgaard.pdf">slides (pdf)</a></li>
           38 </ul>
           39 
           40 <center>
           41         <video poster="video/seaicemuri_damsgaard.jpg"
           42                 controls preload="none" class="mediaframe">
           43                 <source src="video/seaicemuri_damsgaard.mp4" type="video/mp4">
           44                 <a href="video/seaicemuri_damsgaard.mp4">Link</a>
           45         </video>
           46 </center>
           47 
           48 <p>Several <a href="https://seaicemuri.org/presentations.html">other
           49 presentations</a> to the workshop are also already available.</p>