A simple heat‐conduction method for simulating the frost‐table depth in hydrological models
Abstract Hillslope runoff in permafrost regions covered by organic soil is strongly influenced by subsurface flow in the active layer, as well as surface flow where the active layer is very shallow. Flow rates in the organic‐rich active layer are strongly dependent on the depth to the thawing front...
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crwiley:10.1002/hyp.6792 2024-06-23T07:53:39+00:00 A simple heat‐conduction method for simulating the frost‐table depth in hydrological models Hayashi, Masaki Goeller, Neil Quinton, William L. Wright, Nicole 2007 http://dx.doi.org/10.1002/hyp.6792 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fhyp.6792 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.6792 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Hydrological Processes volume 21, issue 19, page 2610-2622 ISSN 0885-6087 1099-1085 journal-article 2007 crwiley https://doi.org/10.1002/hyp.6792 2024-06-11T04:42:26Z Abstract Hillslope runoff in permafrost regions covered by organic soil is strongly influenced by subsurface flow in the active layer, as well as surface flow where the active layer is very shallow. Flow rates in the organic‐rich active layer are strongly dependent on the depth to the thawing front (i.e. frost table) and the corresponding soil hydraulic conductivity at that depth. Therefore, hydrological models for permafrost terrains need to simulate the thawing of the active layer accurately. In order to simulate the downward movement of the frost table, a simple heat‐conduction model was proposed and compared to field data from a wet, organic‐covered watershed in a discontinuous permafrost region of Canada. Ground heat flux was measured simultaneously using the calorimetric, gradient, and flux‐plate methods to increase the confidence in data sets. The majority (>86%) of ground heat flux was used to melt the ice in frozen soil, and the soil temperature had a linear profile from the ground surface to the frost table when averaged over several days. Assuming a linear temperature profile, the proposed method calculates the daily rate of thawing from ground surface temperature and bulk thermal conductivity, where the latter is essentially determined by soil water content. Simulated depths to the frost table during three thaw seasons (2003–2005) matched closely with the observed data for two contrasting ground‐cover types with distinctly different thaw rates. The method can be easily implemented in hydrological models, and will provide a useful tool for simulating hillslope drainage in organic‐covered permafrost terrains, and for evaluating the effects of topography and land cover on the temporal and seasonal variability of the frost table. Copyright © 2007 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice permafrost Wiley Online Library Canada Hydrological Processes 21 19 2610 2622 |
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English |
description |
Abstract Hillslope runoff in permafrost regions covered by organic soil is strongly influenced by subsurface flow in the active layer, as well as surface flow where the active layer is very shallow. Flow rates in the organic‐rich active layer are strongly dependent on the depth to the thawing front (i.e. frost table) and the corresponding soil hydraulic conductivity at that depth. Therefore, hydrological models for permafrost terrains need to simulate the thawing of the active layer accurately. In order to simulate the downward movement of the frost table, a simple heat‐conduction model was proposed and compared to field data from a wet, organic‐covered watershed in a discontinuous permafrost region of Canada. Ground heat flux was measured simultaneously using the calorimetric, gradient, and flux‐plate methods to increase the confidence in data sets. The majority (>86%) of ground heat flux was used to melt the ice in frozen soil, and the soil temperature had a linear profile from the ground surface to the frost table when averaged over several days. Assuming a linear temperature profile, the proposed method calculates the daily rate of thawing from ground surface temperature and bulk thermal conductivity, where the latter is essentially determined by soil water content. Simulated depths to the frost table during three thaw seasons (2003–2005) matched closely with the observed data for two contrasting ground‐cover types with distinctly different thaw rates. The method can be easily implemented in hydrological models, and will provide a useful tool for simulating hillslope drainage in organic‐covered permafrost terrains, and for evaluating the effects of topography and land cover on the temporal and seasonal variability of the frost table. Copyright © 2007 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Hayashi, Masaki Goeller, Neil Quinton, William L. Wright, Nicole |
spellingShingle |
Hayashi, Masaki Goeller, Neil Quinton, William L. Wright, Nicole A simple heat‐conduction method for simulating the frost‐table depth in hydrological models |
author_facet |
Hayashi, Masaki Goeller, Neil Quinton, William L. Wright, Nicole |
author_sort |
Hayashi, Masaki |
title |
A simple heat‐conduction method for simulating the frost‐table depth in hydrological models |
title_short |
A simple heat‐conduction method for simulating the frost‐table depth in hydrological models |
title_full |
A simple heat‐conduction method for simulating the frost‐table depth in hydrological models |
title_fullStr |
A simple heat‐conduction method for simulating the frost‐table depth in hydrological models |
title_full_unstemmed |
A simple heat‐conduction method for simulating the frost‐table depth in hydrological models |
title_sort |
simple heat‐conduction method for simulating the frost‐table depth in hydrological models |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1002/hyp.6792 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fhyp.6792 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.6792 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Hydrological Processes volume 21, issue 19, page 2610-2622 ISSN 0885-6087 1099-1085 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/hyp.6792 |
container_title |
Hydrological Processes |
container_volume |
21 |
container_issue |
19 |
container_start_page |
2610 |
op_container_end_page |
2622 |
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1802645404567732224 |