Coupling GPR and ERT data interpretation to study the thermal imprint of a river in Syrdakh (Central Yakutia, Russia)
International audience The thermal influence of a river on the surface conditions of a continuous permafrost in Yedoma sediments of Central Yakutia (Siberia, Russia) is studied by active layer (AL) thickness measurements along a cross section, CS9, with direct AL measurements (e.g. drilling), Ground...
Published in: | 18th International Conference on Ground Penetrating Radar, Golden, Colorado, 14–19 June 2020 |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , |
Format: | Conference Object |
Language: | English |
Published: |
HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.science/hal-04455273 https://hal.science/hal-04455273/document https://hal.science/hal-04455273/file/Ext-Abs-Syrdakh-fin.pdf https://doi.org/10.1190/gpr2020-025.1 |
Summary: | International audience The thermal influence of a river on the surface conditions of a continuous permafrost in Yedoma sediments of Central Yakutia (Siberia, Russia) is studied by active layer (AL) thickness measurements along a cross section, CS9, with direct AL measurements (e.g. drilling), Ground-Penetrating Radar (GPR) and Electrical Resistivity Tomography (ERT) during late September 2017 and 2018. Reflections on the unfrozen/frozen interface when shallower than 2 m is detected on GPR data while ERT data inversion provides models of electrical resistivity down to 5 m. We study the effect of constraining ERT data inversion (using BERT software) with interface depth derived from GPR data and direct AL measurements, where available. The geophysical data enable us to reveal spatial variability in active layer depths, possibly related to river thermal influence. We compare our results with the 0 • C isotherm obtained through simulating heat transfers with prescribed soil water content properties. We deduce a first estimate of the thermal imprint of the river. |
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