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(HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
Date: Mon, 15 Jun 2020 13:48:58 +0200
Add ESCO2020 post
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A pages/006-esco2020.html | 51 +++++++++++++++++++++++++++++++
A pages/006-esco2020.txt | 43 ++++++++++++++++++++++++++++++
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+filename=esco2020.html
+title=ESCO 2020 talk: The role of granular mechanics and porous flow for ice sheet behavior
+description=Talk at ESCO 2020, the 7th European Seminar on Computing
+id=esco2020
+tags=science, glaciology, ice sheet
+created=2020-06-15
+updated=2020-06-15
(DIR) diff --git a/pages/006-esco2020.html b/pages/006-esco2020.html
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+<p><a href="https://www.esco2020.femhub.com/">ESCO 2020</a>, the
+7th European Seminar on Computing, was held between June 8 and 12.
+I presented my current research on ice-sheet and sediment mechanics.
+Full abstract:</p>
+
+<blockquote>
+<b>The role of granular mechanics and porous flow for ice sheet behavior in a changing climate</b>
+<br><br>
+Ice sheets and glaciers commonly flow over sedimentary deposits,
+in particular in areas of fast ice flow. The basal sediments are
+weakened by high water pressure provided by ice melt and limited
+drainage. Areas of fast flow are primary contributors to sea-level
+rise, so an accurate understanding of the thermomechanical multiphysics
+problem of ice, water, and sediment is crucial for predicting
+dynamical behavior under future climate scenarios. The in-situ
+observational basis from borehole measurements shows that the
+subglacial environment is highly dynamic. Water pressures, strain
+rate, and glacial sliding patterns are extremely variable in time
+and space, and hint towards significant complexity beyond current
+modelling approaches. Sediment transport by ice flow reshapes the
+bed, and can feed back to the ice flow physics. In this presentation
+I explain our efforts to numerically describe the subglacial sediment
+mechanics and fluid dynamics, and how the processes affect ice sheet
+behavior. GPU-based particle-scale simulations using the discrete
+element method and porous fluid dynamics provide detailed insight
+into sediment and meltwater dynamics. However, the intense
+computational requirements severely limit their applicability to
+coupled simulations of ice and bed. Our newest efforts use continuum
+models of non-local granular fluidity to simulate essential behavior
+on larger spatial and temporal scales. We show that the variability
+observed in field borehole measurements can be explained by considering
+the coupled dynamics of the ice-water-sediment system. From these
+dynamics ice flow has the ability to rapidly reshape its bed,
+providing additional feedbacks to ice contribution to sea level in
+a changing climate.</blockquote>
+
+<p>Slides and video below:</p>
+
+<ul>
+<li><a href="npub/esco2020-damsgaard.pdf">slides (pdf)</a></li>
+</ul>
+
+<center>
+ <video poster="video/damsgaard_esco2020.jpg"
+ controls preload="none" class="mediaframe">
+ <source src="video/damsgaard_esco2020.webm" type="video/webm">
+ <source src="video/damsgaard_esco2020.ogv" type="video/ogg">
+ <source src="video/damsgaard_esco2020.mp4" type="video/mp4">
+ <a href="video/damsgaard_esco2020.mp4">Link</a>
+ </video>
+</center>
(DIR) diff --git a/pages/006-esco2020.txt b/pages/006-esco2020.txt
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+[1]ESCO 2020, the 7th European Seminar on Computing, was held between June 8
+and 12. I presented my current research on ice-sheet and sediment mechanics.
+
+Full abstract:
+
+ Title: The role of granular mechanics and porous flow for ice
+ sheet behavior in a changing climate
+
+ Ice sheets and glaciers commonly flow over sedimentary deposits, in
+ particular in areas of fast ice flow. The basal sediments are weakened by
+ high water pressure provided by ice melt and limited drainage. Areas of
+ fast flow are primary contributors to sea-level rise, so an accurate
+ understanding of the thermomechanical multiphysics problem of ice, water,
+ and sediment is crucial for predicting dynamical behavior under future
+ climate scenarios. The in-situ observational basis from borehole
+ measurements shows that the subglacial environment is highly dynamic. Water
+ pressures, strain rate, and glacial sliding patterns are extremely variable
+ in time and space, and hint towards significant complexity beyond current
+ modelling approaches. Sediment transport by ice flow reshapes the bed, and
+ can feed back to the ice flow physics. In this presentation I explain our
+ efforts to numerically describe the subglacial sediment mechanics and fluid
+ dynamics, and how the processes affect ice sheet behavior. GPU-based
+ particle-scale simulations using the discrete element method and porous
+ fluid dynamics provide detailed insight into sediment and meltwater
+ dynamics. However, the intense computational requirements severely limit
+ their applicability to coupled simulations of ice and bed. Our newest
+ efforts use continuum models of non-local granular fluidity to simulate
+ essential behavior on larger spatial and temporal scales. We show that the
+ variability observed in field borehole measurements can be explained by
+ considering the coupled dynamics of the ice-water-sediment system. From
+ these dynamics ice flow has the ability to rapidly reshape its bed,
+ providing additional feedbacks to ice contribution to sea level in a
+ changing climate.
+
+Slides and video below:
+
+ - slides: https://adamsgaard.dk/npub/esco2020-damsgaard.pdf
+ - video: https://adamsgaard.dk/video/damsgaard_esco2020.mp4
+
+
+References:
+
+[1] https://www.esco2020.femhub.com/