tadd AGU 2021 post - adamsgaard.dk - my academic webpage
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(DIR) commit ce993c6767b00b7e4900c6aa6ddab028b1ad6367
(DIR) parent 6d4eb44c62db0ba92fe44739d4927a7c4ca88cd6
(HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
Date: Sun, 12 Dec 2021 21:21:01 +0100
add AGU 2021 post
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+filename=agu2021.html
+title=AGU 2021: Process-based modeling of glacial till advection
+description=Recorded talk for American Geophysical Union 2021 Fall Meeting
+id=agu2021
+tags=science, glaciology, ice sheet
+created=2021-12-12
+updated=2021-12-12
(DIR) diff --git a/pages/012-agu2021.html b/pages/012-agu2021.html
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+<p> Below is my recorded talk for the <a
+href="https://www.agu.org/Fall-Meeting">American Geophysical Union 2021 Fall Meeting</a>.
+Full abstract:</p>
+
+<blockquote>
+<b>Title: Process-based modeling of glacial till advection</b>
+<br><br>
+Anders Damsgaard(1), Jan A. Piotrowski(1), Ian Madden(2), Jenny Suckale(2), Kenny K. Sørensen(3)
+<br><br>
+1: Department of Geoscience, Aarhus University, Denmark
+<br>
+2: Department of Geophysics, Stanford University, CA, USA
+<br>
+3: Department of Civil and Architectural Engineering, Aarhus University, Denmark
+<br><br>
+Glacial flow can reshape the Earth surface through erosion and
+deposition. Many past and present ice sheets lie on soft beds, and till
+mobilization and transport is governed by the degree of basal coupling,
+fluctuations in thermal state, subglacial hydrology, and the mechanics of
+the basal till itself. Changes in basal topography due to ice movement
+could theoretically feed back onto ice-flow dynamics. For example,
+the buildup of sedimentary grounding-zone wedges at the marine termini
+of ice streams may stabilize their position against local sea-level
+change. However, modeling of subglacial till advection has previously
+relied on fluid-like rheologies, which contrasts the now established
+concensus of Mohr-Coulomb plasticity.
+<br><br>
+In our work, we aim to improve the parameterization of till advection by
+glacial flow. We compare a new continuum model for till against laboratory
+consolidation and ring-shear experiments. We show how transient dynamics
+in porosity and strength affect the mechanics under non-steady forcings,
+such as glacier stick-slip or surge. We couple the till continuum model
+to an ice-stream model, and demonstrate how till transport varies when
+ice flows over simple soft-bed basal geometries, and affects ice-stream
+sensitivity to external forcings.</blockquote>
+
+
+<p>Slides and video:</p>
+
+<ul>
+<li><a href="npub/agu2021-damsgaard.pdf">slides (pdf)</a></li>
+</ul>
+
+<center>
+ <video poster="video/agu2021-damsgaard.jpg"
+ controls preload="none" class="mediaframe">
+ <source src="video/agu2021-damsgaard.mp4" type="video/mp4">
+ <a href="video/agu2021-damsgaard.mp4">Link</a>
+ </video>
+</center>
(DIR) diff --git a/pages/012-agu2021.txt b/pages/012-agu2021.txt
t@@ -0,0 +1,43 @@
+Below is my recorded talk for the [1]American Geophysical Union 2021 Fall
+Meeting. Full abstract:
+
+ Title: Process-based modeling of glacial till advection
+
+ Anders Damsgaard(1), Jan A. Piotrowski(1), Ian Madden(2), Jenny Suckale(2),
+ Kenny K. Sørensen(3)
+
+ 1: Department of Geoscience, Aarhus University, Denmark
+ 2: Department of Geophysics, Stanford University, CA, USA
+ 3: Department of Civil and Architectural Engineering, Aarhus University,
+ Denmark
+
+ Glacial flow can reshape the Earth surface through erosion and deposition.
+ Many past and present ice sheets lie on soft beds, and till mobilization
+ and transport is governed by the degree of basal coupling, fluctuations in
+ thermal state, subglacial hydrology, and the mechanics of the basal till
+ itself. Changes in basal topography due to ice movement could theoretically
+ feed back onto ice-flow dynamics. For example, the buildup of sedimentary
+ grounding-zone wedges at the marine termini of ice streams may stabilize
+ their position against local sea-level change. However, modeling of
+ subglacial till advection has previously relied on fluid-like rheologies,
+ which contrasts the now established concensus of Mohr-Coulomb plasticity.
+
+ In our work, we aim to improve the parameterization of till advection by
+ glacial flow. We compare a new continuum model for till against laboratory
+ consolidation and ring-shear experiments. We show how transient dynamics in
+ porosity and strength affect the mechanics under non-steady forcings, such
+ as glacier stick-slip or surge. We couple the till continuum model to an
+ ice-stream model, and demonstrate how till transport varies when ice flows
+ over simple soft-bed basal geometries, and affects ice-stream sensitivity
+ to external forcings.
+
+Slides and video:
+
+ - slides: gopher://adamsgaard.dk/9/npub/agu2021-damsgaard.pdf
+ - video: https://adamsgaard.dk/video/agu2021-damsgaard.mp4
+
+References:
+
+[1] https://www.agu.org/Fall-Meeting
+[2] file:///home/ad/code/adamsgaard.dk/pages/npub/agu2021-damsgaard.pdf
+[3] file:///home/ad/code/adamsgaard.dk/pages/video/agu2021-damsgaard.mp4