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       t006-esco2020.html (2579B)
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            1 <p><a href="https://www.esco2020.femhub.com/">ESCO 2020</a>, the
            2 7th European Seminar on Computing, was held between June 8 and 12.
            3 I presented my current research on ice-sheet and sediment mechanics.
            4 Full abstract:</p>
            5 
            6 <blockquote>
            7 <b>The role of granular mechanics and porous flow for ice sheet behavior in a changing climate</b>
            8 <br><br>
            9 Ice sheets and glaciers commonly flow over sedimentary deposits,
           10 in particular in areas of fast ice flow.  The basal sediments are
           11 weakened by high water pressure provided by ice melt and limited
           12 drainage.  Areas of fast flow are primary contributors to sea-level
           13 rise, so an accurate understanding of the thermomechanical multiphysics
           14 problem of ice, water, and sediment is crucial for predicting
           15 dynamical behavior under future climate scenarios.  The in-situ
           16 observational basis from borehole measurements shows that the
           17 subglacial environment is highly dynamic.  Water pressures, strain
           18 rate, and glacial sliding patterns are extremely variable in time
           19 and space, and hint towards significant complexity beyond current
           20 modelling approaches.  Sediment transport by ice flow reshapes the
           21 bed, and can feed back to the ice flow physics.  In this presentation
           22 I explain our efforts to numerically describe the subglacial sediment
           23 mechanics and fluid dynamics, and how the processes affect ice sheet
           24 behavior.  GPU-based particle-scale simulations using the discrete
           25 element method and porous fluid dynamics provide detailed insight
           26 into sediment and meltwater dynamics.  However, the intense
           27 computational requirements severely limit their applicability to
           28 coupled simulations of ice and bed.  Our newest efforts use continuum
           29 models of non-local granular fluidity to simulate essential behavior
           30 on larger spatial and temporal scales.  We show that the variability
           31 observed in field borehole measurements can be explained by considering
           32 the coupled dynamics of the ice-water-sediment system.  From these
           33 dynamics ice flow has the ability to rapidly reshape its bed,
           34 providing additional feedbacks to ice contribution to sea level in
           35 a changing climate.</blockquote>
           36 
           37 <p>Slides and video below:</p>
           38 
           39 <ul>
           40 <li><a href="npub/esco2020-damsgaard.pdf">slides (pdf)</a></li>
           41 </ul>
           42 
           43 <center>
           44         <video poster="video/damsgaard_esco2020.jpg"
           45                 controls preload="none" class="mediaframe">
           46                 <source src="video/damsgaard_esco2020.webm" type="video/webm">
           47                 <source src="video/damsgaard_esco2020.ogv" type="video/ogg">
           48                 <source src="video/damsgaard_esco2020.mp4" type="video/mp4">
           49                 <a href="video/damsgaard_esco2020.mp4">Link</a>
           50         </video>
           51 </center>