{"dp_type": "Dataset", "free_text": "Effective Pressure"}
[{"awards": "2048315 Zoet, Lucas", "bounds_geometry": null, "date_created": "Wed, 04 Feb 2026 00:00:00 GMT", "description": "This data was used to constrain the relationship between effective stress, porosity and drag as the effective stress was transiently varied. ", "east": null, "geometry": null, "keywords": "Antarctica; Basal Drag; Cryosphere; Effective Pressure; Till", "locations": "Antarctica", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Zoet, Lucas", "project_titles": "Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data", "projects": [{"proj_uid": "p0010550", "repository": "USAP-DC", "title": "Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "ring shear transient drag vs effective stress data", "uid": "602004", "west": null}, {"awards": "2048315 Zoet, Lucas", "bounds_geometry": null, "date_created": "Fri, 19 Dec 2025 00:00:00 GMT", "description": "This data set contains seismic data obtained from a series of PZT transducers that were placed in the upper platen of the ring shear device. ", "east": null, "geometry": null, "keywords": "Active Source Seismic; Antarctica; Bed Reflectivity; Cryosphere; Glaciology", "locations": "Antarctica", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Zoet, Lucas", "project_titles": "Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data", "projects": [{"proj_uid": "p0010550", "repository": "USAP-DC", "title": "Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "UW Ringshear Seismic data", "uid": "602012", "west": null}, {"awards": "2048315 Zoet, Lucas", "bounds_geometry": null, "date_created": "Mon, 08 Dec 2025 00:00:00 GMT", "description": "Deformation of subglacial sediment during basal slip shapes the beds of many fast-flowing glaciers and ice streams. The resultant sediment flux impacts glacier dynamics and rates of subglacial erosion over a range of timescales, but its fundamental dependencies are not well understood. Using a cryogenic ring shear device, we conducted a suite of experiments to investigate the effects of both effective normal stress and slip speed on rates of till transport. Sediment fluxes were computed using digital image correlation from a photographic time series of the till bed. We find a near linear relationship between sediment flux and slip speed, but a non-monotonic, double-valued dependency of sediment flux on effective stress. Deformation primarily occurred in a narrow shear band near the ice sole, the thickness of which could vary with both parameters. Coupling between ice and till increased at higher slip speeds and effective stresses and scaled the magnitude of the flow profile.", "east": null, "geometry": null, "keywords": "Antarctica; Cryosphere", "locations": "Antarctica", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Zoet, Lucas", "project_titles": "Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data", "projects": [{"proj_uid": "p0010550", "repository": "USAP-DC", "title": "Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Till flux dependence on effective pressure", "uid": "602003", "west": null}]
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| Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Bounds Geometry | Geometry | Selected | Visible |
|---|---|---|---|---|---|---|---|---|---|
|
ring shear transient drag vs effective stress data
|
2048315 |
2026-02-04 | Zoet, Lucas |
Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data |
This data was used to constrain the relationship between effective stress, porosity and drag as the effective stress was transiently varied. | [] | [] | false | false |
|
UW Ringshear Seismic data
|
2048315 |
2025-12-19 | Zoet, Lucas |
Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data |
This data set contains seismic data obtained from a series of PZT transducers that were placed in the upper platen of the ring shear device. | [] | [] | false | false |
|
Till flux dependence on effective pressure
|
2048315 |
2025-12-08 | Zoet, Lucas |
Collaborative Research: Estimating Subglacial Effective Pressure with Active-source Seismic Data |
Deformation of subglacial sediment during basal slip shapes the beds of many fast-flowing glaciers and ice streams. The resultant sediment flux impacts glacier dynamics and rates of subglacial erosion over a range of timescales, but its fundamental dependencies are not well understood. Using a cryogenic ring shear device, we conducted a suite of experiments to investigate the effects of both effective normal stress and slip speed on rates of till transport. Sediment fluxes were computed using digital image correlation from a photographic time series of the till bed. We find a near linear relationship between sediment flux and slip speed, but a non-monotonic, double-valued dependency of sediment flux on effective stress. Deformation primarily occurred in a narrow shear band near the ice sole, the thickness of which could vary with both parameters. Coupling between ice and till increased at higher slip speeds and effective stresses and scaled the magnitude of the flow profile. | [] | [] | false | false |
