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Causes and Processes of Thermo‐Erosional Gully Initiation Near Tiksi Settlement, Arctic Eastern Siberia

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  • Anna Tarbeeva
  • Yana Tikhonravova
  • Lyudmila Lebedeva
  • Anna Kut
  • Vladimir Shamov

Abstract

Climatic and environmental change is leading to increased frequency and intensity of permafrost degradation processes; however, our knowledge of their mechanisms and rate is still limited. We examined structure of deposits, surface topography, and weather conditions during the initiation of a thermo‐erosion gully in eastern Siberia and monitored its changes between 2020 and 2022. The initiation of the gully was caused by a combination of processes: (1) the catchment area of the gully was artificially increased several decades ago as a result of the interception of runoff by the winter road; (2) ice‐wedge degradation led to surface runoff concentration above the gully head, while a large volume of ground ice remained in other parts of the slope, and frost cracking continued; (3) the entry of water into frost cracks formed underground tunnels; and (4) high air temperatures and heavy rainfall immediately before the gully appearance resulted in the expansion of the tunnels and collapse of their roof. In 2 years, the volume of the gully reached 1000 m3; at least 40% of that volume consists of ground ice. The gully development did not significantly change the water chemistry due to significant water freshening caused by melting of ground ice.

Suggested Citation

  • Anna Tarbeeva & Yana Tikhonravova & Lyudmila Lebedeva & Anna Kut & Vladimir Shamov, 2024. "Causes and Processes of Thermo‐Erosional Gully Initiation Near Tiksi Settlement, Arctic Eastern Siberia," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 35(3), pages 357-372, July.
    • Handle: RePEc:wly:perpro:v:35:y:2024:i:3:p:357-372
    DOI: 10.1002/ppp.2229
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