干旱区生态环境知识资源中心(Arid): Thermal-water-salt coupling process of unsaturated saline soil under unidirectional freezing

Arid

DOI	10.1007/s11629-022-7652-7
	Thermal-water-salt coupling process of unsaturated saline soil under unidirectional freezing
	Luo, Chong-liang; Yu, Yun-yan; Zhang, Jing; Tao, Jing-yan; Ou, Qing-jie; Cui, Wen-hao
通讯作者	Yu, YY
来源期刊	JOURNAL OF MOUNTAIN SCIENCE
ISSN	1672-6316
EISSN	1993-0321
出版年	2023
卷号	20 期号:2 页码:557-569
英文摘要	Salinization and desertification are closely related to water-salt migration caused by a temperature gradient. Based on the Darcy Law of unsaturated soils, the law of energy conservation and the law of mass conservation, the thermal-water-salt coupling mathematical model of unsaturated frozen saline soil was established. The model considered the latent heat of phase change, crystallization impedance, crystallization consumption and complete precipitation of solute crystallization in ice. In order to verify the rationality of the model, the unidirectional freezing test of unsaturated saline soil was carried out in an open system with no-pressure water supplement to obtain the spatial distribution of temperature, moisture and salt in the saline soil. Finally, numerical simulations are implemented with the assistance of COMSOL Multiphysics. Validation of the model is illustrated by comparisons between the simulation and experimental data. The results demonstrated that the temperature within saline soil changes with time and can be divided into three stages, namely quick freezing stage, transitional stage and stable stage. The water and salt contents in the freezing zone are layered, with peak values at the freezing front. The coupled model could reveal the heat-mass migration mechanism of unsaturated frozen saline soil and dynamically describe the freezing depth and the movement law of the freezing front, ice and salt crystal formation mechanism, and the change law of thermal conductivity and permeability coefficient.
英文关键词	Unsaturated sulfate saline soil Watersalt migration Crystallization latent heat Crystallization impedance Mathematical model
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000924142300019
WOS关键词	MIGRATION ; HEAT ; TEMPERATURE ; TRANSPORT ; FLOW
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397485
推荐引用方式 GB/T 7714	Luo, Chong-liang,Yu, Yun-yan,Zhang, Jing,et al. Thermal-water-salt coupling process of unsaturated saline soil under unidirectional freezing[J],2023,20(2):557-569.
APA	Luo, Chong-liang,Yu, Yun-yan,Zhang, Jing,Tao, Jing-yan,Ou, Qing-jie,&Cui, Wen-hao.(2023).Thermal-water-salt coupling process of unsaturated saline soil under unidirectional freezing.JOURNAL OF MOUNTAIN SCIENCE,20(2),557-569.
MLA	Luo, Chong-liang,et al."Thermal-water-salt coupling process of unsaturated saline soil under unidirectional freezing".JOURNAL OF MOUNTAIN SCIENCE 20.2(2023):557-569.