Numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming
Numerical simulations of coupled groundwater flow and heat transport are used to address how hydrogeological conditions can affect permafrost dynamics. The simulations are based on a two-dimensional vertical-plane conceptual model of a study site at the Iqaluit Airport, Nunavut, Canada, which includ...
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crcansciencepubl:10.1139/cgj-2017-0182 2024-09-15T18:15:13+00:00 Numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming Shojae Ghias, Masoumeh Therrien, René Molson, John Lemieux, Jean-Michel 2019 http://dx.doi.org/10.1139/cgj-2017-0182 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cgj-2017-0182 http://www.nrcresearchpress.com/doi/pdf/10.1139/cgj-2017-0182 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Geotechnical Journal volume 56, issue 3, page 436-448 ISSN 0008-3674 1208-6010 journal-article 2019 crcansciencepubl https://doi.org/10.1139/cgj-2017-0182 2024-08-15T04:09:29Z Numerical simulations of coupled groundwater flow and heat transport are used to address how hydrogeological conditions can affect permafrost dynamics. The simulations are based on a two-dimensional vertical-plane conceptual model of a study site at the Iqaluit Airport, Nunavut, Canada, which includes a 50 m deep permafrost terrain with a shallow active layer, overlain by a paved taxiway with winter snow-covered embankments. Coupled groundwater flow and advective–conductive heat transport with freeze–thaw dynamics, temperature-dependent pore-water freezing functions, and latent heat are included in the model. The simulation results show that a smooth (low-slope) freezing function with a higher residual unfrozen moisture content produced a deeper thaw front compared to that using a steeper freezing function, generating a maximum increase in the depth to permafrost of 17.5 m after 268 years. Permafrost thaw rates in high-permeability zones within a heterogeneous system were also relatively higher compared to an otherwise equivalent homogeneous soil, resulting in a maximum increase of 2.6 m in the depth to permafrost after 238 years. As recharge water cools while flowing along the upgradient permafrost table, advectively driven heat transport is paradoxically shown to temporarily increase the height of the permafrost table in downgradient areas. Article in Journal/Newspaper Iqaluit Nunavut permafrost Canadian Science Publishing Canadian Geotechnical Journal 56 3 436 448 |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
Numerical simulations of coupled groundwater flow and heat transport are used to address how hydrogeological conditions can affect permafrost dynamics. The simulations are based on a two-dimensional vertical-plane conceptual model of a study site at the Iqaluit Airport, Nunavut, Canada, which includes a 50 m deep permafrost terrain with a shallow active layer, overlain by a paved taxiway with winter snow-covered embankments. Coupled groundwater flow and advective–conductive heat transport with freeze–thaw dynamics, temperature-dependent pore-water freezing functions, and latent heat are included in the model. The simulation results show that a smooth (low-slope) freezing function with a higher residual unfrozen moisture content produced a deeper thaw front compared to that using a steeper freezing function, generating a maximum increase in the depth to permafrost of 17.5 m after 268 years. Permafrost thaw rates in high-permeability zones within a heterogeneous system were also relatively higher compared to an otherwise equivalent homogeneous soil, resulting in a maximum increase of 2.6 m in the depth to permafrost after 238 years. As recharge water cools while flowing along the upgradient permafrost table, advectively driven heat transport is paradoxically shown to temporarily increase the height of the permafrost table in downgradient areas. |
format |
Article in Journal/Newspaper |
author |
Shojae Ghias, Masoumeh Therrien, René Molson, John Lemieux, Jean-Michel |
spellingShingle |
Shojae Ghias, Masoumeh Therrien, René Molson, John Lemieux, Jean-Michel Numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming |
author_facet |
Shojae Ghias, Masoumeh Therrien, René Molson, John Lemieux, Jean-Michel |
author_sort |
Shojae Ghias, Masoumeh |
title |
Numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming |
title_short |
Numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming |
title_full |
Numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming |
title_fullStr |
Numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming |
title_full_unstemmed |
Numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming |
title_sort |
numerical simulations of shallow groundwater flow and heat transport in continuous permafrost setting under impact of climate warming |
publisher |
Canadian Science Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1139/cgj-2017-0182 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cgj-2017-0182 http://www.nrcresearchpress.com/doi/pdf/10.1139/cgj-2017-0182 |
genre |
Iqaluit Nunavut permafrost |
genre_facet |
Iqaluit Nunavut permafrost |
op_source |
Canadian Geotechnical Journal volume 56, issue 3, page 436-448 ISSN 0008-3674 1208-6010 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cgj-2017-0182 |
container_title |
Canadian Geotechnical Journal |
container_volume |
56 |
container_issue |
3 |
container_start_page |
436 |
op_container_end_page |
448 |
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1810452974264123392 |