Coupled water-vapor-heat transport in shallow unsaturated zone of active layer in permafrost regions

doi:10.16285/j.rsm.2017.1128

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	Coupled water-vapor-heat transport in shallow unsaturated zone of active layer in permafrost regions
	Zhang, Ming-Li 1,2,3; Wen, Zhi 3; Dong, Jian-Hua 1; Wang, De-Kai 2; Hou, Yan-Dong 1; Xue, Ke 3; Yang, Xiao-Yu 1; Sun, Guo-Dong 1
刊名	Yantu Lixue/Rock and Soil Mechanics
	2018-02-10
卷号	39 期号:2 页码:561-570
关键词	Atmospheric movements Evaporation Groundwater Heat conduction Heat flux Heat transfer Liquids Mass transfer Moisture Permafrost Rain Thermal Engineering Thermal gradients Thermodynamic stability Active Layer Heat and mass transfer models Meteorological condition Permafrost degradation Rainfall infiltration Unsaturated soil Vapor flows Water transport
ISSN号	10007598
DOI	10.16285/j.rsm.2017.1128
英文摘要	The thermal-moisture dynamics of the active layer directly affects the stability of permafrost and engineering projects in cold regions. Previous studies mainly focus on the thermal stability of permafrost based on the adherent layer theory. The migration process of liquid water and water vapor and its effects on the active layer are still lack of consideration. Considering the physical process and mechanism of liquid water-vapor transfer in unsaturated soils, a new heat and mass transfer model in saturated-unsaturated partially frozen soil was developed, in which the moisture migration in both vapor and liquid phases and heat transfer by means of conduction, convection and phase change were accommodated. The established water-vapor-heat transport model was used to analyze the water-vapor-heat transport in the shallow unsaturated zone of active layer under the in-situ meteorological conditions. The results show that the liquid water and water vapor are driven by the temperature gradient flow downward during daytime but upward at night, the liquid water and water vapor are driven by the temperature gradient flow upward in warm season but downward in cold season. Vapor water accounts for more than 15% of the water flux in the active layer and the water vapor driven by the pressure head can be neglected throughout the year. The moisture transport is mainly controlled by temperature gradient in sunny days. During and after rainfall events, rainfall infiltration is significantly enhanced and liquid water and water vapor mainly infiltrate downward. Rainfall can significantly decrease surface soil heat flux, heat conduction and soil temperature, which mitigate the permafrost degradation process. © 2018, Science Press. All right reserved.
WOS研究方向	Engineering
语种	中文
出版者	Academia Sinica
WOS记录号	WOS:000427565400020
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114842]
专题	土木工程学院
作者单位	1.College of Civil Engineering, Lanzhou University of Technology, Lanzhou; Gansu; 730050, China; 2.Geological Hazards Prevention Institute, Gansu Academy of Sciences, Lanzhou; Gansu; 730000, China; 3.State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environmental and Resources, Chinese Academy of Sciences, Lanzhou; Gansu; 730000, China
推荐引用方式 GB/T 7714	Zhang, Ming-Li,Wen, Zhi,Dong, Jian-Hua,et al. Coupled water-vapor-heat transport in shallow unsaturated zone of active layer in permafrost regions[J]. Yantu Lixue/Rock and Soil Mechanics,2018,39(2):561-570.
APA	Zhang, Ming-Li.,Wen, Zhi.,Dong, Jian-Hua.,Wang, De-Kai.,Hou, Yan-Dong.,...&Sun, Guo-Dong.(2018).Coupled water-vapor-heat transport in shallow unsaturated zone of active layer in permafrost regions.Yantu Lixue/Rock and Soil Mechanics,39(2),561-570.
MLA	Zhang, Ming-Li,et al."Coupled water-vapor-heat transport in shallow unsaturated zone of active layer in permafrost regions".Yantu Lixue/Rock and Soil Mechanics 39.2(2018):561-570.