Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation
The specific impact of glacial processes on groundwater flow and solute transport under ice-sheets was determined by means of numerical simulations. Groundwater flow and the transport of δ18O, TDS, and groundwater age were simulated in a generic sedimentary basin during a single glacial event follow...
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fthindawi:oai:hindawi.com:10.1155/2017/4598902 2023-05-15T16:37:19+02:00 Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation Arnaud Sterckx Jean-Michel Lemieux Rein Vaikmäe 2017 https://doi.org/10.1155/2017/4598902 en eng Geofluids https://doi.org/10.1155/2017/4598902 Copyright © 2017 Arnaud Sterckx et al. Research Article 2017 fthindawi https://doi.org/10.1155/2017/4598902 2019-05-26T08:23:19Z The specific impact of glacial processes on groundwater flow and solute transport under ice-sheets was determined by means of numerical simulations. Groundwater flow and the transport of δ18O, TDS, and groundwater age were simulated in a generic sedimentary basin during a single glacial event followed by a postglacial period. Results show that simulating subglacial recharge with a fixed flux boundary condition is relevant only for small fluxes, which could be the case under partially wet-based ice-sheets. Glacial loading decreases overpressures, which appear only in thick and low hydraulic diffusivity layers. If subglacial recharge is low, glacial loading can lead to underpressures after the retreat of the ice-sheet. Isostasy reduces considerably the infiltration of meltwater and the groundwater flow rates. Below permafrost, groundwater flow is reduced under the ice-sheet but is enhanced beyond the ice-sheet front. Accounting for salinity-dependent density reduces the infiltration of meltwater at depth. This study shows that each glacial process is potentially relevant in models of subglacial groundwater flow and solute transport. It provides a good basis for building and interpreting such models in the future. Article in Journal/Newspaper Ice Ice Sheet permafrost Hindawi Publishing Corporation Geofluids 2017 1 12 |
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Open Polar |
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Hindawi Publishing Corporation |
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fthindawi |
language |
English |
description |
The specific impact of glacial processes on groundwater flow and solute transport under ice-sheets was determined by means of numerical simulations. Groundwater flow and the transport of δ18O, TDS, and groundwater age were simulated in a generic sedimentary basin during a single glacial event followed by a postglacial period. Results show that simulating subglacial recharge with a fixed flux boundary condition is relevant only for small fluxes, which could be the case under partially wet-based ice-sheets. Glacial loading decreases overpressures, which appear only in thick and low hydraulic diffusivity layers. If subglacial recharge is low, glacial loading can lead to underpressures after the retreat of the ice-sheet. Isostasy reduces considerably the infiltration of meltwater and the groundwater flow rates. Below permafrost, groundwater flow is reduced under the ice-sheet but is enhanced beyond the ice-sheet front. Accounting for salinity-dependent density reduces the infiltration of meltwater at depth. This study shows that each glacial process is potentially relevant in models of subglacial groundwater flow and solute transport. It provides a good basis for building and interpreting such models in the future. |
format |
Article in Journal/Newspaper |
author |
Arnaud Sterckx Jean-Michel Lemieux Rein Vaikmäe |
spellingShingle |
Arnaud Sterckx Jean-Michel Lemieux Rein Vaikmäe Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation |
author_facet |
Arnaud Sterckx Jean-Michel Lemieux Rein Vaikmäe |
author_sort |
Arnaud Sterckx |
title |
Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation |
title_short |
Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation |
title_full |
Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation |
title_fullStr |
Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation |
title_full_unstemmed |
Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation |
title_sort |
representing glaciations and subglacial processes in hydrogeological models: a numerical investigation |
publisher |
Geofluids |
publishDate |
2017 |
url |
https://doi.org/10.1155/2017/4598902 |
genre |
Ice Ice Sheet permafrost |
genre_facet |
Ice Ice Sheet permafrost |
op_relation |
https://doi.org/10.1155/2017/4598902 |
op_rights |
Copyright © 2017 Arnaud Sterckx et al. |
op_doi |
https://doi.org/10.1155/2017/4598902 |
container_title |
Geofluids |
container_volume |
2017 |
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1 |
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12 |
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1766027606306586624 |