009-seaicemuri.html (2168B)
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>