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Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska

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  • Eva Stephani
  • Jeremiah Drage
  • Duane Miller
  • Benjamin M. Jones
  • Mikhail Kanevskiy

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.

Suggested Citation

  • Eva Stephani & Jeremiah Drage & Duane Miller & Benjamin M. Jones & Mikhail Kanevskiy, 2020. "Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 31(2), pages 239-254, April.
    • Handle: RePEc:wly:perpro:v:31:y:2020:i:2:p:239-254
    DOI: 10.1002/ppp.2046
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