adamsgaard.dk

my academic webpage
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commit ce993c6767b00b7e4900c6aa6ddab028b1ad6367
parent 6d4eb44c62db0ba92fe44739d4927a7c4ca88cd6
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date:   Sun, 12 Dec 2021 21:21:01 +0100

add AGU 2021 post

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Apages/012-agu2021.cfg | 7+++++++
Apages/012-agu2021.html | 50++++++++++++++++++++++++++++++++++++++++++++++++++
Apages/012-agu2021.txt | 43+++++++++++++++++++++++++++++++++++++++++++
3 files changed, 100 insertions(+), 0 deletions(-)

diff --git a/pages/012-agu2021.cfg b/pages/012-agu2021.cfg @@ -0,0 +1,7 @@ +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 @@ -0,0 +1,50 @@ +<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> diff --git a/pages/012-agu2021.txt b/pages/012-agu2021.txt @@ -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