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Communication Dans Un Congrès Année : 2018

Overcoming data scarcity of active layer thicknesses using geophysics

Albane Saintenoy
Eric Pohl
  • Fonction : Auteur
Christophe Grenier
  • Fonction : Auteur
  • PersonId : 993271
Antoine Séjourné
Pavel Konstantinov
  • Fonction : Auteur
  • PersonId : 1281542
  • IdRef : 270111247
Kirill Bazhin
Alexander Fedorov

Résumé

The thermal imprint of a typical river in the continuous permafrost of Central Yakutia (Siberia, Russia) is studied by active layer thickness measurements along six cross sections, either directly or with geophysical methods. Ground-Penetrating Radar (GPR) and Electrical Resistivity Tomography (ERT) measurements provide permafrost depths comparable to direct measurements acquired in boreholes and pits when available. Geophysical data interpretations complement non-instrumented cross-sections and show that the unfrozen/frozen interface is deeper below the riverbed for all studied cross sections and depends on the local river width. GPR data provide depths of 1 to 2 m with a sampling step as small as 5 cm when the riverbed width is less than 8 m. Where riverbeds are wider, ERT data are more adapted than GPR in imaging the unfrozen layer. ERT data indicates a permafrost boundary as deep as 6 m for the wide river cases, compared to less than 2 m for the narrower ones. The geophysical data enabled us to reveal an exceptional spatial variability in active layer depths that could not be attributed with in situ measurements before.
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Dates et versions

hal-04455462 , version 1 (13-02-2024)

Identifiants

  • HAL Id : hal-04455462 , version 1

Citer

Albane Saintenoy, Eric Pohl, Christophe Grenier, Antoine Séjourné, Ivan Khristoforov, et al.. Overcoming data scarcity of active layer thicknesses using geophysics. EUCOP 5 - 5th European Conference on Permafrost, Jun 2018, Chamonix, France. pp.900. ⟨hal-04455462⟩
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