Numerical analysis of cooling performance of a novel structure affected by aeolian sand clogging on expressway embankment in permafrost regions

Ma, Qinguo; Luo, Xiaoxiao; Niu, Fujun; Sun, Weiyu; Lan, Tianli; Xia, Huxi

doi:10.1016/j.ijheatmasstransfer.2022.122538

Cited by 19 publications

(1 citation statement)

References 49 publications

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“…During rainfall, evaporation and freezing-thawing process, the water within unsaturated soil migrates in the form of liquid water and vaporous water (Philip and De Vries, 1957;Saito et al, 2006). The convective effect of water influences the heat transfer in the unsaturated soil (Ma et al, 2022a;Ma et al, 2022b).…”

Section: Effect Of Sand Layer On Heat Convectionmentioning

confidence: 99%

The hydrothermal process of aeolian sand and its thermal effect on permafrost in Qinghai-Tibetan Plateau considering rainfall and evaporation under climate warming

Lan

Xia

et al. 2022

Front. Environ. Sci.

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As the heat exchange interface between atmosphere and permafrost, land cover regulates the influence of climate warming on permafrost. With the development of desertification on the Qinghai-Tibetan Plateau (QTP), aeolian sand has emerged as a significant environmental factor influencing the hydrothermal process of permafrost. To reveal the hydro-thermal process within aeolian sand layer and the thermal effect of sand layer on permafrost in the QTP, a coupled hydro-thermo-vapor model considering rainfall and evaporation was established, and the long-term hydrothermal variation of stratum covered by aeolian sand were analyzed. The results show that: 1) Aeolian sand layer is conducive to alleviating permafrost degradation. The alleviation effect is related to the thickness of sand layer. 2) Water redistribution in sand layer and water accumulation in stratum are connected to thickness of sand layer. For the thin sand layer, the water content is low and remains unchanged in different years. The thick sand layer, acting as a permeability diode, makes the degree of water accumulation in sand layer considerable and the water storage of the stratum increase continuously. 3) When the sand layer becomes thicker, the increment of the equivalent thermal conductivity in cold season is larger than that in warm season, which will lead to the decrease of annual conductive heat. 4) In thin sand layer, heat convection and heat conduction are relatively small in the early stage, and heat conduction is the primary mode in the long term. In thick sand layer, heat transfer is dominated by heat convection and heat conduction in the early stage, but it is primarily reliant on heat convection in the long term.

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Section: Effect Of Sand Layer On Heat Convectionmentioning

confidence: 99%

The hydrothermal process of aeolian sand and its thermal effect on permafrost in Qinghai-Tibetan Plateau considering rainfall and evaporation under climate warming

Lan

Xia

et al. 2022

Front. Environ. Sci.

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Quantifying the effect of a retrogressive thaw slump on soil freeze–thaw erosion in permafrost regions on the Qinghai–Tibet Plateau, China

et al. 2023

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Thermokarst terrain is developing at an accelerating pace in the ice‐rich permafrost on the Qinghai–Tibet Plateau (QTP), China, and the most dramatic of these terrain‐altering thermokarsts is retrogressive thaw slump (RTS). The freeze–thaw erosion (FTE) impacts are sharply increasing on the Plateau due to RTS, especially as a result of the migration of fine sediments in cold climates, these impacts are still not quantified due to the limitation of hydro‐thermal‐mass transport laws in RTS development. Moreover, it is difficult to assess the impact of RTS on the ecology and environment, especially on soil erosion. This study developed a heat–water‐mass transport coupled model of a RTS in the Beiluhe River Region on the QTP, considering the actual topography, water‐ice phase change, latent heat, and surface heat exchange layer. Based on the observed data of ground temperature, unfrozen water content, and heat flux, the coupled model herein is practicable for presenting the geotemperature regime and groundwater flow in the RTS area, thereby quantifying the ice‐rich permafrost thaw and mass wasting. The results presented indicate that: (1) the seepage velocity of the superficial zone (0–1.5 m depth) is two orders of magnitude higher than that of the permafrost table; (2) the mean ice‐rich permafrost thaw volume was 13.4 m2 from 2016 to 2021; and (3) the cumulative mass transport volume was 22 m2 from July 2020 to September 2021. In addition, the relation between the FTE (shown as the migration of sediments) and the amount of ground ice ablation can be fitted by an exponential equation. This work proposes a reliable method for quantifying the effect of FTE and is helpful to assess the eco‐environmental impacts of RTS.

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Thermal performance of cast-in-place piles with artificial ground freezing in permafrost regions

Wang,

Chen,

et al. 2024

J. Mt. Sci.

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Numerical analysis of cooling performance of a novel structure affected by aeolian sand clogging on expressway embankment in permafrost regions

Cited by 19 publications

References 49 publications

The hydrothermal process of aeolian sand and its thermal effect on permafrost in Qinghai-Tibetan Plateau considering rainfall and evaporation under climate warming

The hydrothermal process of aeolian sand and its thermal effect on permafrost in Qinghai-Tibetan Plateau considering rainfall and evaporation under climate warming

Quantifying the effect of a retrogressive thaw slump on soil freeze–thaw erosion in permafrost regions on the Qinghai–Tibet Plateau, China

Thermal performance of cast-in-place piles with artificial ground freezing in permafrost regions

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