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Talus and its cooling effects on the thermal regime of permafrost: A review

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  • Shengtao Lan
  • Bin Cao
  • Yan Hu
  • Ziyong Sun
  • Rui Ma
  • Xin Li

Abstract

Talus, as the product of movement and accumulation along the slope after the cracking of cliffs or steep rock walls, is a common landform in the mountain periglacial environment. Significant thermal anomalies within talus have been widely reported to be a result of cooling effects. During the cold season, the increased temperature difference between talus and the ambient environment strengthens the intensity of convection (vertical flows) and transforms into upward advection (lateral flows) and exhausts the internal warm current. During the warm season, heat is concentrated on the surface of the talus, and the internal dominant cold current moves downward along the slope by advection. The principle of the proactive cooling effects of talus has been widely utilized in railway construction within permafrost regions as embankments to alleviate degradation of the underlying permafrost. However, limited model studies have examined the cooling effects of blocky debris in nature, and in situ observations are rare. Therefore, it will be important to increase observations and develop process‐based models that couple heat conduction, convection/advection, water transfer processes, and even the latent heat of phase change. This will help to better understand the extent of the cooling effects and its impact on the thermal regime of permafrost.

Suggested Citation

  • Shengtao Lan & Bin Cao & Yan Hu & Ziyong Sun & Rui Ma & Xin Li, 2024. "Talus and its cooling effects on the thermal regime of permafrost: A review," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 35(1), pages 60-75, January.
    • Handle: RePEc:wly:perpro:v:35:y:2024:i:1:p:60-75
    DOI: 10.1002/ppp.2213
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    References listed on IDEAS

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    1. Stuart A. Harris & David E. Pedersen, 1998. "Thermal regimes beneath coarse blocky materials," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 9(2), pages 107-120, April.
    2. Bernard Francou & Claude Manté, 1990. "Analysis of the segmentation in the profile of alpine talus slopes," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 1(1), pages 53-60, January.
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