干旱区生态环境知识资源中心(Arid): Evaporation-induced salt crystallization and feedback on hydrological functions in porous media with different grain morphologies

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DOI	10.1016/j.jhydrol.2021.126427
	Evaporation-induced salt crystallization and feedback on hydrological functions in porous media with different grain morphologies
	Dong, Li; Xiong, Yunwu; Huang, Quanzhong; Xu, Xu; Huo, Zailin; Huang, Guanhua
通讯作者	Xiong, YW (corresponding author), China Agr Univ, Coll Water Resources & Civil Engn, Ctr Agr Water Res China, Beijing 100083, Peoples R China.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	598
英文摘要	Evaporation from porous media in the presence of dissolved salts is an important topic in relation to several environmental issues. In this study, we investigated the interaction of evaporation, salt crystallization and the internal structure of the porous material. Porous columns with different internal structures were generated through random packing of angular quartz sand and round glass beads. Evaporation-induced salt efflorescence on the surface of porous media was recorded by a camera with micro lens. The internal pore structure before and after salt crystallization was visualized using the x-ray computed tomography and quantified by the extracted pore networks. Hydraulic properties in the absence/presence of salt crystals were simulated numerically using the pore-network approach and partially measured experimentally. The evaporative water loss ratio in the angular quartz sand was greater than that in the glass beads with the same sieving size. The evaporation of saline water in angular quartz sand and round glass beads can be separated into three stages similar to water evaporation. Salt efflorescence was generated a crust dome architecture on the surface of the angular sand, but was in tight patchy contact with the round glass beads. The presence of salt crust interrupted the exchange of vapor between the porous media and atmosphere, hindering evaporation. Salt subflorescence clogged some of the pores, and the pore size distribution shifted to smaller sizes part. The porosity decreased and the geometric tortuosity of the porous materials increased owing to salt subflorescence. The presence of subflorescence salt crystals decreased the intrinsic permeability and relative diffusion coefficient of different porous media. The relationship between the vapor diffusion coefficients and porosity is linear in the presence/absence of salt crystallization, considering the geometric tortuosity. The findings indicate that the feedback of salt precipitation on hydraulic properties and vapor diffusion must be considered to accurately quantify hydrological processes, particularly in arid and semi-arid areas where intensive evaporation is accompanied by soil salinization and water shortage.
英文关键词	Evaporation Saline water Salt crystallization Pore structure Vapor diffusion coefficient
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000661813200158
WOS关键词	SALINE WATER EVAPORATION ; SODIUM-CHLORIDE ; PORE STRUCTURE ; NETWORK ; PRECIPITATION ; EFFLORESCENCE ; HETEROGENEITY ; IMPACT ; DAMAGE ; SCALE
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350906
作者单位	[Dong, Li; Xiong, Yunwu; Huang, Quanzhong; Xu, Xu; Huo, Zailin; Huang, Guanhua] China Agr Univ, Coll Water Resources & Civil Engn, Ctr Agr Water Res China, Beijing 100083, Peoples R China; [Xiong, Yunwu; Huang, Quanzhong; Xu, Xu; Huang, Guanhua] China Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Dong, Li,Xiong, Yunwu,Huang, Quanzhong,et al. Evaporation-induced salt crystallization and feedback on hydrological functions in porous media with different grain morphologies[J]. 中国农业大学,2021,598.
APA	Dong, Li,Xiong, Yunwu,Huang, Quanzhong,Xu, Xu,Huo, Zailin,&Huang, Guanhua.(2021).Evaporation-induced salt crystallization and feedback on hydrological functions in porous media with different grain morphologies.JOURNAL OF HYDROLOGY,598.
MLA	Dong, Li,et al."Evaporation-induced salt crystallization and feedback on hydrological functions in porous media with different grain morphologies".JOURNAL OF HYDROLOGY 598(2021).