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| Created: | Feb 08, 2023 at 2:47 a.m. | |
| Last updated: | Feb 08, 2023 at 2:47 a.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
Basal water pressure and water flow patterns are significant factors in controlling the behavior of an ice sheet, because they influence ice-sheet thickness, stability and extent. Water produced by basal melting may infiltrate the subsurface, or occur as sheet or channelized flow at the ice/bed interface. We examine subglacial groundwater conditions along a flowline of the Scandinavian ice sheet through Nordfjord, in the western fjords region of southern Norway, using a steady-state, two-dimensional groundwater-flow model. Meltwater input to the groundwater model is calculated by a two-dimensional, time-dependent, thermomechanically coupled ice-flow model oriented along the same flowline. Model results show that the subglacial sediments could not have transmitted all the meltwater out of the fjord during times of ice advance and when the ice sheet was at its maximum position at the edge of the continental shelf. In order for pore-water pressures to remain below the overburden pressure of the overlying ice, other paths of subglacial drainage are necessary to remove excess water. During times of retreat, the subglacial aquifer is incapable of transmitting all the meltwater that was probably generated. Pulses of meltwater reaching the bed could explain non-climatically driven margin readvances during the overall retreat phase.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.3189/172756507781833811 |
| Depth | 1000 |
| Scale | 10 001 - 100 000 km² |
| Layers | 2-5 layers |
| Purpose | Climate change |
| GroMoPo_ID | 138 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.3189/172756507781833811 |
| Model Time | SS |
| Model Year | 2007 |
| Model Authors | C. A. Moeller, D. M. Mickelson, M. P. Anderson, C. Winguth |
| Model Country | Norway |
| Data Available | Report/paper only |
| Developer Email | moeller@geology.wisc.edu |
| Dominant Geology | Unconsolidated sediments |
| Developer Country | University of Wisconsin-Madison, USA |
| Publication Title | Groundwater flow beneath Late Weichselian glacier ice in Nordfjord, Norway |
| Original Developer | No |
| Additional Information | This groundwater model assesses the subglacial groundwater flow in the western fjords region in southern Norway. Meltwater input to the groundwater model is calculated by a two-dimensional, time-dependent, thermomechanically coupled ice-flow model oriented along the same flowline |
| Integration or Coupling | Ice flow modelling and meltwater modelling |
| Evaluation or Calibration | Static water levels |
| Geologic Data Availability |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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