Journal
RENEWABLE ENERGY
Volume 199, Issue -, Pages 1033-1046Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2022.09.031
Keywords
Air convection embankment; Snow insulation; Permafrost degradation; Talik development; Northern infrastructure; Climate change
Funding
- State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources [SKLFSE-ZQ-202101]
- State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University [SKLBT-ZD2103]
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This study investigates the impacts of snow cover on the air circulation pattern and finds that snow greatly weakens the cooling effect of closed embankment slopes. On the other hand, a U-shape closed embankment performs better in cooling due to stronger air convection in winter. The results suggest that a U-shape embankment can be a potential long-term solution to mitigate permafrost thaw.
In northern regions, air convection embankment (ACE) has been implemented to mitigate road subsidence caused by permafrost degradation. The seasonal snow cover largely alters the surface energy balance and adversely affects the thermal stability of the road. However, thermal characteristics of a closed ACE and the quantification of their impacts on talik development remain largely unknown, especially in the present and future context of global warming. Here, impacts of snow cover on the pattern and strength of the air circulation were investigated and quantified. Snow cover greatly weakened the cooling effect of the closed ACE side slopes. The pore air velocity of the crushed-rock layer was reduced by half and the mean annual heat flux increased by approximately 1.6 W/m(2), in comparison to the snow-free case. Conversely, the U-shape closed ACE had a better cooling performance due to a stronger air convection in winter, which increased heat loss from the snow-free surface of the embankment center. Our simulations suggest that the U-shape ACE embankment is a potential long-term solution to mitigate permafrost thaw over the life service (50 years) of road embankments in sub-arctic regions. The net results of this study are imperative to improve engineered design and road maintenance in cold regions.
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