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