tadd AGU 2021 post - adamsgaard.dk - my academic webpage | |
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commit ce993c6767b00b7e4900c6aa6ddab028b1ad6367 | |
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Author: Anders Damsgaard <[email protected]> | |
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 | |
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 M… | |
+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), Ke… | |
+<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, Denma… | |
+<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> | |
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 |