https://csdms.colorado.edu/csdms_wiki/api.php?action=feedcontributions&feedformat=atom&user=Epierce 2026-04-28T21:29:44Z User contributions MediaWiki 1.44.2 https://csdms.colorado.edu/csdms_wiki/index.php?title=2021_CSDMS_meeting-067&diff=325098 2021-05-17T19:34:00Z

<p>Epierce: </p> <hr /> <div>{{CSDMS meeting personal information template-2021<br /> |CSDMS meeting first name=Ethan<br /> |CSDMS meeting last name=Pierce<br /> |CSDMS meeting institute=University of Colorado Boulder<br /> |CSDMS meeting city=Boulder<br /> |CSDMS meeting country=United States<br /> |CSDMS meeting state=Colorado<br /> |CSDMS meeting email address=ethan.pierce@colorado.edu<br /> }}<br /> {{CSDMS meeting select clinics1 2021<br /> |CSDMS_meeting_select_clinics1_2021=3) An Introduction to using Google Earth Engine<br /> }}<br /> {{CSDMS meeting select clinics2 2021<br /> |CSDMS_meeting_select_clinics2_2021=5) Building Interactive Dashboards for ESP Modeling with Python &amp; Jupyter<br /> }}<br /> {{CSDMS meeting select clinics3 2021<br /> |CSDMS_meeting_select_clinics3_2021=3) Digital Twins in Earth Sciences<br /> }}<br /> {{CSDMS meeting abstract yes no 2021<br /> |CSDMS meeting abstract submit=Yes<br /> }}<br /> {{CSDMS meeting abstract title temp2021<br /> |CSDMS meeting abstract title=Modeling the controls on till equilibrium line position beneath a synthetic outlet glacier<br /> |Working_group_member_WG_FRG=Terrestrial Working Group<br /> }}<br /> {{CSDMS meeting authors template<br /> |CSDMS meeting coauthor first name abstract=Irina<br /> |CSDMS meeting coauthor last name abstract=Overeem<br /> |CSDMS meeting coauthor institute / Organization=University of Colorado Boulder<br /> |CSDMS meeting coauthor town-city=Boulder<br /> |CSDMS meeting coauthor country=United States<br /> |State=Colorado<br /> |CSDMS meeting coauthor email address=irina.overeem@colorado.edu<br /> }}<br /> {{CSDMS meeting abstract template 2021<br /> |CSDMS meeting abstract=Outlet glaciers convey large quantities of ice, sediment, and water from the interior of ice sheets to the coastal ocean. Beneath ice sheets, sediment is transported by melt water, entrainment in basal ice layers, and deformation of the till layer. Till deformation occurs when the ice sliding velocity exceeds a certain threshold, causing buried clasts to plough the sediment layer (Zoet and Iverson, 2020). Because ice velocity tends to decrease below the ice equilibrium line, but the threshold velocity to induce ploughing stays constant, the glacier will deposit till around the “till equilibrium line,” where the ice sliding velocity drops below the threshold velocity (Alley et al., 1989). Investigating the controls on till equilibrium lines will improve our understanding of erosion and sediment transport beneath glaciers and ice sheets. Here, we implement a numerical model of steady-state till equilibrium line position under a synthetic outlet glacier. We explore the influence of ice sliding velocity, clast sizes and distribution, and effective pressure at the bed. Additionally, we consider the case where the threshold velocity to induce ploughing is not constant, but instead depends on ice and sediment properties.<br /> <br /> <br /> Zoet, L. K., &amp; Iverson, N. R. (2020). A slip law for glaciers on deformable beds. Science, 368(6486), 76-78.<br /> <br /> Alley, R. B., Blankenship, D. D., Rooney, S. T., &amp; Bentley, C. R. (1989). Sedimentation beneath ice shelves—the view from ice stream B. Marine Geology, 85(2-4), 101-120.<br /> }}<br /> {{CSDMS meeting abstract figures<br /> |CSDMS meeting abstract figure=CSDMS Poster 2021.pdf<br /> }}<br /> {{blank line template}}</div>

Epierce https://csdms.colorado.edu/csdms_wiki/index.php?title=File:CSDMS_Poster_2021.pdf&diff=325097 2021-05-17T19:33:51Z

<p>Epierce: </p> <hr /> <div></div>

Epierce https://csdms.colorado.edu/csdms_wiki/index.php?title=2021_CSDMS_meeting-067&diff=321158 2021-04-30T20:46:11Z

<p>Epierce: </p> <hr /> <div>{{CSDMS meeting personal information template-2021<br /> |CSDMS meeting first name=Ethan<br /> |CSDMS meeting last name=Pierce<br /> |CSDMS meeting institute=University of Colorado Boulder<br /> |CSDMS meeting city=Boulder<br /> |CSDMS meeting country=United States<br /> |CSDMS meeting state=Colorado<br /> |CSDMS meeting email address=ethan.pierce@colorado.edu<br /> }}<br /> {{CSDMS meeting select clinics1 2021<br /> |CSDMS_meeting_select_clinics1_2021=3) An Introduction to using Google Earth Engine<br /> }}<br /> {{CSDMS meeting select clinics2 2021<br /> |CSDMS_meeting_select_clinics2_2021=5) Building Interactive Dashboards for ESP Modeling with Python &amp; Jupyter<br /> }}<br /> {{CSDMS meeting select clinics3 2021<br /> |CSDMS_meeting_select_clinics3_2021=3) Digital Twins in Earth Sciences<br /> }}<br /> {{CSDMS meeting abstract yes no 2021<br /> |CSDMS meeting abstract submit=Yes<br /> }}<br /> {{CSDMS meeting abstract title temp2021<br /> |CSDMS meeting abstract title=Modeling the controls on till equilibrium line position beneath a synthetic outlet glacier<br /> |Working_group_member_WG_FRG=Terrestrial Working Group<br /> }}<br /> {{CSDMS meeting authors template<br /> |CSDMS meeting coauthor first name abstract=Irina<br /> |CSDMS meeting coauthor last name abstract=Overeem<br /> |CSDMS meeting coauthor institute / Organization=University of Colorado Boulder<br /> |CSDMS meeting coauthor town-city=Boulder<br /> |CSDMS meeting coauthor country=United States<br /> |State=Colorado<br /> |CSDMS meeting coauthor email address=irina.overeem@colorado.edu<br /> }}<br /> {{CSDMS meeting abstract template 2021<br /> |CSDMS meeting abstract=Outlet glaciers convey large quantities of ice, sediment, and water from the interior of ice sheets to the coastal ocean. Beneath ice sheets, sediment is transported by melt water, entrainment in basal ice layers, and deformation of the till layer. Till deformation occurs when the ice sliding velocity exceeds a certain threshold, causing buried clasts to plough the sediment layer (Zoet and Iverson, 2020). Because ice velocity tends to decrease below the ice equilibrium line, but the threshold velocity to induce ploughing stays constant, the glacier will deposit till around the “till equilibrium line,” where the ice sliding velocity drops below the threshold velocity (Alley et al., 1989). Investigating the controls on till equilibrium lines will improve our understanding of erosion and sediment transport beneath glaciers and ice sheets. Here, we implement a numerical model of steady-state till equilibrium line position under a synthetic outlet glacier. We explore the influence of ice sliding velocity, clast sizes and distribution, and effective pressure at the bed. Additionally, we consider the case where the threshold velocity to induce ploughing is not constant, but instead depends on ice and sediment properties.<br /> <br /> <br /> Zoet, L. K., &amp; Iverson, N. R. (2020). A slip law for glaciers on deformable beds. Science, 368(6486), 76-78.<br /> <br /> Alley, R. B., Blankenship, D. D., Rooney, S. T., &amp; Bentley, C. R. (1989). Sedimentation beneath ice shelves—the view from ice stream B. Marine Geology, 85(2-4), 101-120.<br /> }}<br /> {{blank line template}}</div>

Epierce https://csdms.colorado.edu/csdms_wiki/index.php?title=2021_CSDMS_meeting-067&diff=321156 2021-04-30T20:45:43Z

<p>Epierce: </p> <hr /> <div>{{CSDMS meeting personal information template-2021<br /> |CSDMS meeting first name=Ethan<br /> |CSDMS meeting last name=Pierce<br /> |CSDMS meeting institute=University of Colorado Boulder<br /> |CSDMS meeting city=Boulder<br /> |CSDMS meeting country=United States<br /> |CSDMS meeting state=Colorado<br /> |CSDMS meeting email address=ethan.pierce@colorado.edu<br /> }}<br /> {{CSDMS meeting select clinics1 2021<br /> |CSDMS_meeting_select_clinics1_2021=3) An Introduction to using Google Earth Engine<br /> }}<br /> {{CSDMS meeting select clinics2 2021<br /> |CSDMS_meeting_select_clinics2_2021=5) Building Interactive Dashboards for ESP Modeling with Python &amp; Jupyter<br /> }}<br /> {{CSDMS meeting select clinics3 2021<br /> |CSDMS_meeting_select_clinics3_2021=3) Digital Twins in Earth Sciences<br /> }}<br /> {{CSDMS meeting abstract yes no 2021<br /> |CSDMS meeting abstract submit=Yes<br /> }}<br /> {{CSDMS meeting abstract title temp2021<br /> |CSDMS meeting abstract title=Modeling the controls on till equilibrium line position beneath a synthetic outlet glacier<br /> |Working_group_member_WG_FRG=Terrestrial Working Group<br /> }}<br /> {{CSDMS meeting authors template<br /> |CSDMS meeting coauthor first name abstract=Irina<br /> |CSDMS meeting coauthor last name abstract=Overeem<br /> |CSDMS meeting coauthor institute / Organization=University of Colorado Boulder<br /> |CSDMS meeting coauthor town-city=Boulder<br /> |CSDMS meeting coauthor country=United States<br /> |State=Colorado<br /> |CSDMS meeting coauthor email address=irina.overeem@colorado.edu<br /> }}<br /> {{CSDMS meeting abstract template 2021<br /> |CSDMS meeting abstract=Outlet glaciers convey large quantities of ice, sediment, and water from the interior of ice sheets to the coastal ocean. Beneath ice sheets, sediment is transported by melt water, entrainment in basal ice layers, and deformation of the till layer. Till deformation occurs when the ice sliding velocity exceeds a certain threshold, causing buried clasts to plough the sediment layer (Zoet and Iverson, 2020). Because ice velocity tends to decrease below the ice equilibrium line, but the threshold velocity to induce ploughing stays constant, the glacier will deposit till around the “till equilibrium line,” where the ice sliding velocity drops below the threshold velocity (Alley et al., 1989). Investigating the controls on till equilibrium lines will improve our understanding of erosion and sediment transport beneath glaciers and ice sheets. Here, we implement a numerical model of steady-state till equilibrium line position under a synthetic outlet glacier. We explore the influence of ice sliding velocity, clast sizes and distribution, and effective pressure at the bed. Additionally, we consider the case where the threshold velocity to induce ploughing is not constant, but instead depends on ice and sediment properties.<br /> <br /> Zoet, L. K., &amp; Iverson, N. R. (2020). A slip law for glaciers on deformable beds. Science, 368(6486), 76-78.<br /> Alley, R. B., Blankenship, D. D., Rooney, S. T., &amp; Bentley, C. R. (1989). Sedimentation beneath ice shelves—the view from ice stream B. Marine Geology, 85(2-4), 101-120.<br /> }}<br /> {{blank line template}}</div>

Epierce https://csdms.colorado.edu/csdms_wiki/index.php?title=2019_CSDMS_meeting-120&diff=224755 2019-04-19T14:30:28Z

<p>Epierce: Created page with &quot;{{CSDMS meeting personal information template-2019 |CSDMS meeting first name=Ethan |CSDMS meeting last name=Pierce |CSDMS meeting institute=Brown University |CSDMS meeting cit...&quot;</p> <hr /> <div>{{CSDMS meeting personal information template-2019<br /> |CSDMS meeting first name=Ethan<br /> |CSDMS meeting last name=Pierce<br /> |CSDMS meeting institute=Brown University<br /> |CSDMS meeting city=Providence<br /> |CSDMS meeting country=United States<br /> |CSDMS meeting state=Rhode Island<br /> |CSDMS meeting email address=ethan_pierce@brown.edu<br /> |CSDMS meeting phone=(207)518-1356<br /> }}<br /> {{CSDMS meeting scholar and pre-meeting2019<br /> |CSDMS meeting pre-conference2019=Software Carpentry Workshop<br /> }}<br /> {{CSDMS meeting select clinics1 2019<br /> |CSDMS_meeting_select_clinics1_2019=3) Pangeo - Scalable Geoscience Tools Python<br /> }}<br /> {{CSDMS meeting select clinics2 2019<br /> |CSDMS_meeting_select_clinics2_2019=4) Model Calibration with Dakota<br /> }}<br /> {{CSDMS meeting select clinics3 2019<br /> |CSDMS_meeting_select_clinics3_2019=3) SALib - Model Sensitivity Analysis<br /> }}<br /> {{CSDMS scholarships yes no<br /> |CSDMS meeting scholarships=No<br /> }}<br /> {{CSDMS meeting abstract yes no 2019<br /> |CSDMS meeting abstract submit=No<br /> }}<br /> {{CSDMS meeting abstract title temp2019}}<br /> {{CSDMS meeting abstract template 2019}}<br /> {{blank line template}}</div>

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