Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska
Abstract Talik and cryopeg development related to channel migration has been observed in arctic deltas, but our knowledge on the configuration, properties, and rate of freezeback has remained limited. Along a main channel of the Colville River Delta (Alaska), we integrated subsurface data from 79 bo...
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crwiley:10.1002/ppp.2046 2024-09-15T18:11:37+00:00 Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska Stephani, Eva Drage, Jeremiah Miller, Duane Jones, Benjamin M. Kanevskiy, Mikhail National Science Foundation of Sri Lanka Natural Sciences and Engineering Research Council of Canada 2020 http://dx.doi.org/10.1002/ppp.2046 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.2046 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2046 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2046 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 31, issue 2, page 239-254 ISSN 1045-6740 1099-1530 journal-article 2020 crwiley https://doi.org/10.1002/ppp.2046 2024-08-30T04:12:57Z Abstract Talik and cryopeg development related to channel migration has been observed in arctic deltas, but our knowledge on the configuration, properties, and rate of freezeback has remained limited. Along a main channel of the Colville River Delta (Alaska), we integrated subsurface data from 79 boreholes with a remote sensing analysis to measure channel changes in 1948–2013. We found that closed taliks occurred under the active channel and extended into intrapermafrost cryopeg layers under the riverbed/riverbar and active floodplain. Cryopegs as isolated small pockets were also identified at depths in older terrain units. In the study corridor, we estimated that the likelihood of talik and cryopeg occurrence was predominantly (42.2% of area) low, yet a high likelihood was also identified (27.0% of area). Permafrost growth occurred at a rapid rate in the land exposed following channel migration, likely due to the low and delayed release of latent heat as the freezing front progresses downward in the coarse‐grained soils of increasing salinity but decreasing temperatures. As the deposits keep cooling, ground ice will continue forming therefore increasing furthermore the salinity of the remaining unfrozen soil pore‐water and likely prevent the complete freezeback of the cryopegs developed in relation to channel migration. Article in Journal/Newspaper Ice permafrost Permafrost and Periglacial Processes Alaska Wiley Online Library Permafrost and Periglacial Processes 31 2 239 254 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Talik and cryopeg development related to channel migration has been observed in arctic deltas, but our knowledge on the configuration, properties, and rate of freezeback has remained limited. Along a main channel of the Colville River Delta (Alaska), we integrated subsurface data from 79 boreholes with a remote sensing analysis to measure channel changes in 1948–2013. We found that closed taliks occurred under the active channel and extended into intrapermafrost cryopeg layers under the riverbed/riverbar and active floodplain. Cryopegs as isolated small pockets were also identified at depths in older terrain units. In the study corridor, we estimated that the likelihood of talik and cryopeg occurrence was predominantly (42.2% of area) low, yet a high likelihood was also identified (27.0% of area). Permafrost growth occurred at a rapid rate in the land exposed following channel migration, likely due to the low and delayed release of latent heat as the freezing front progresses downward in the coarse‐grained soils of increasing salinity but decreasing temperatures. As the deposits keep cooling, ground ice will continue forming therefore increasing furthermore the salinity of the remaining unfrozen soil pore‐water and likely prevent the complete freezeback of the cryopegs developed in relation to channel migration. |
author2 |
National Science Foundation of Sri Lanka Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Stephani, Eva Drage, Jeremiah Miller, Duane Jones, Benjamin M. Kanevskiy, Mikhail |
spellingShingle |
Stephani, Eva Drage, Jeremiah Miller, Duane Jones, Benjamin M. Kanevskiy, Mikhail Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
author_facet |
Stephani, Eva Drage, Jeremiah Miller, Duane Jones, Benjamin M. Kanevskiy, Mikhail |
author_sort |
Stephani, Eva |
title |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_short |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_full |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_fullStr |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_full_unstemmed |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_sort |
taliks, cryopegs, and permafrost dynamics related to channel migration, colville river delta, alaska |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/ppp.2046 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.2046 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2046 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2046 |
genre |
Ice permafrost Permafrost and Periglacial Processes Alaska |
genre_facet |
Ice permafrost Permafrost and Periglacial Processes Alaska |
op_source |
Permafrost and Periglacial Processes volume 31, issue 2, page 239-254 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.2046 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
31 |
container_issue |
2 |
container_start_page |
239 |
op_container_end_page |
254 |
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1810449205629550592 |