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DOI	10.1016/j.coldregions.2021.103335
	Modeling of coupled transfer of water, heat and solute in saline loess considering sodium sulfate crystallization
	Xu, Jian; Lan, Wei; Ren, Chang; Zhou, Xiangang; Wang, Songhe; Yuan, Jun
通讯作者	Xu, J (通讯作者)，Xian Univ Architecture & Technol, Sch Civil Engn, Xian 710055, Shaanxi, Peoples R China. ; Xu, J (通讯作者)，Xian Univ Architecture & Technol, Shaanxi Key Lab Geotech & Underground Space Engn, Xian 710055, Shaanxi, Peoples R China. ; Wang, SH (通讯作者)，Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg, Xian 710048, Shaanxi, Peoples R China.
发表日期	2021
ISSN	0165-232X
EISSN	1872-7441
卷号	189
英文摘要	The phase change of sodium sulfate significantly affects the salt weathering of loess slopes in seasonal frozen regions, which should be involved in the modeling of heat, water and solute transfer. The governing equation for heat transfer was established based on the Harlan model by incorporating ice-water phase change and crystallization of sodium sulfate and an empirical relationship for thermal conductivity of saline loess. Regarding the moisture field, a modified factor that characterizes the impedance of salt crystals and ice on water migration in frozen area was introduced into the Gardner model. The total suction as a function of water and salt contents was included in the unfrozen water migration equation. Considering the convection, diffusion and phase change of solutes, the equation for salinity field was established by Darcy's and Fick's laws, with a solubility function based on the solubility curve of sodium sulfate. The above models were numerically implemented on COMSOL Multiphysics through the user-defined partial differential equation module. In order to verify the rationality of the method, the profiles of temperature, water and salt contents of saline loess columns obtained by uniaxial freezing tests in closed system were compared with the numerical results. Comparisons show that the simulated profiles of temperature, water and salt contents at three cold-end temperatures (-5, -10 and - 20 degrees C) agree well with the measured data. According to the profile of the amount of crystalline salt, the concept of uncrystallized zone was proposed, which is found to be positively related to the cold-end temperature.
关键词	SOIL HYDRAULIC-PROPERTIES FREEZE-THAW SALT MIGRATION TRANSPORT REDISTRIBUTION TEMPERATURE MECHANISM
英文关键词	Saline loess; Sodium sulfate; Water and solute migration; Salt crystallization; Unfrozen water
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS记录号	WOS:000732745800003
来源期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255156
作者单位	[Xu, Jian; Lan, Wei; Ren, Chang] Xian Univ Architecture & Technol, Sch Civil Engn, Xian 710055, Shaanxi, Peoples R China; [Xu, Jian] Xian Univ Architecture & Technol, Shaanxi Key Lab Geotech & Underground Space Engn, Xian 710055, Shaanxi, Peoples R China; [Zhou, Xiangang; Wang, Songhe] Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg, Xian 710048, Shaanxi, Peoples R China; [Yuan, Jun] China Power Engn Consulting Grp, Northwest Elect Power Design Inst Co Ltd, Xian 710075, Peoples R China; [Yuan, Jun] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Xu, Jian,Lan, Wei,Ren, Chang,et al. Modeling of coupled transfer of water, heat and solute in saline loess considering sodium sulfate crystallization[J]. 中国科学院西北生态环境资源研究院,2021,189.
APA	Xu, Jian,Lan, Wei,Ren, Chang,Zhou, Xiangang,Wang, Songhe,&Yuan, Jun.(2021).Modeling of coupled transfer of water, heat and solute in saline loess considering sodium sulfate crystallization.COLD REGIONS SCIENCE AND TECHNOLOGY,189.
MLA	Xu, Jian,et al."Modeling of coupled transfer of water, heat and solute in saline loess considering sodium sulfate crystallization".COLD REGIONS SCIENCE AND TECHNOLOGY 189(2021).