The changing permafrost environment under desertification and the heat transfer mechanism in the Qinghai-Tibetan Plateau

被引:1
作者
Lan, Tianli [1 ]
Lai, Yuanming [1 ]
Gao, Jianqiang [2 ]
Luo, Xiaoxiao [3 ]
Ma, Qinguo [1 ]
机构
[1] South China Univ Technol, State Key Lab Subtrop Bldg & Urban Sci, Guangzhou 510641, Guangdong, Peoples R China
[2] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730070, Gansu, Peoples R China
[3] Guangzhou Maritime Univ, Sch Civil & Engn Management, Guangzhou 510725, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
Desertification; Aeolian sand; Permafrost; Heat transfer; Hydrothermal effect; Qinghai-Tibetan Plateau; SURFACE; RAILWAY; CONDUCTIVITY; REGION; DESERT; MODEL;
D O I
10.1016/j.jenvman.2024.122055
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
With the development of desertification in the Qinghai-Tibet Plateau (QTP), aeolian sand becomes the remarkable local factor affecting the thermal state of permafrost along the Qinghai-Tibet Engineering Corridor (QTEC). In this study, a model experiment was conducted to analyze the impact of thickness and water content of aeolian sand on its thermal effect, and a hydro-thermo-vapor coupling model of frozen soil was carried out to reveal the heat transfer mechanism of the aeolian sand layer (ASL) with different thicknesses and its hydrothermal effect on permafrost. The results indicate that: (1) ASL with the thickness larger than 80 cm has the property of converting precipitation into soil water. The thicker the ASL, the more precipitation infiltrates and accumulates in the soil layer. (2) The cooling effect of ASL on permafrost results from the lower net surface radiation, causing the annual average surface heat flux shifting from heat inflow to heat outflow. The warming effect of ASL on permafrost results from the increasing convective heat accompanying the infiltrated precipitation. (3) As the ASL thickens, the thermal effect of ASL on permafrost gradually shifts from the cooling effect dominated by heat radiation and heat conduction to the warming effect dominated by precipitation infiltration and heat convection. The warming effect of thick ASL on permafrost requires a certain amount of years to manifest, and the critical thickness is suggested to be larger than 120 cm.
引用
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页数:18
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