气候变化领域集成服务门户(CCPortal): Impact of Cooling on Water and Salt Migration of High-Chlorine Saline Soils

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DOI	10.1155/2021/8612762
	Impact of Cooling on Water and Salt Migration of High-Chlorine Saline Soils
	Tian, Runze; Zhang, Yu; Xu, Anhua; Li, Xuemei; Hou, Yunlong; Tai, Bowen
通讯作者	Zhang, Y (通讯作者)，Lanzhou Jiaotong Univ, Sch Traff & Transportat, Lanzhou 730070, Peoples R China.
发表日期	2021
ISSN	1468-8115
EISSN	1468-8123
卷号	2021
英文摘要	Secondary salinization is a common problem in saline soil projects. In order to grasp the mechanism of water and salt migration of high-chlorine saline soil during the cooling process, the saline soils along the Qarhan-Golmud Highway in the Qinghai-Tibet Plateau were selected as test samples. Firstly, the basic physical parameter test and the soluble salt chemical experiment were carried out and obtained liquid and plastic limits, dry density, etc. Secondly, freezing temperature experiments and water-salt migration experiments under one-way cooling conditions were conducted according to the actual environmental conditions, and after the temperature gradient line of the soil sample was stable, water content and labile salt chemistry experiments were conducted to obtain the distribution of water and salt contents of soil samples. Finally, the effect of crystallization-water phase transition on water and salt migration and the effect of chloride salt on the temperature of crystallization-water phase transition were considered, and a mathematical model applicable to the water and salt migration of highly chlorinated saline soils under the effect of unidirectional cooling was established and solved with COMSOL Multiphysics software, and the correctness of the model was verified by comparing the simulation results with the experimental results. The study found that (1) during the one-way cooling process, both water and salt showed a tendency to migrate to the cold end. The MC (saline soil with medium chlorine content) with an initial water content of 16.9% and Cl- content of 3.373% was measured to reach a 17.6% water content and 3.76% Cl- content at the cold (top) end after the experiment. The HC (saline soil with high chlorine content) with an initial water content of 6.6% and Cl- content of 17.928% was measured to reach a 6.83% water content and 18.8% Cl- content after the experiment and (2) after the one-way cooling experiment of the MC, the water content at a distance of 1-2 cm from the cold end has abrupt changes, which may be caused by a small amount of crystallization-water phase transition at this location. At the same time, according to the temperature change graph during the cooling process, the phase change temperature was set to -9 degrees C in the numerical simulation process to match the experimental results.
关键词	POROUS-MEDIA FREEZE-THAW FROZEN SOIL TRANSPORT HEAT
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Geology
WOS类目	Geochemistry & Geophysics ; Geology
WOS记录号	WOS:000695400500004
来源期刊	GEOFLUIDS
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/254449
作者单位	[Tian, Runze; Zhang, Yu] Lanzhou Jiaotong Univ, Sch Traff & Transportat, Lanzhou 730070, Peoples R China; [Xu, Anhua] Qinghai Commun Tech Coll, Xining 810003, Peoples R China; [Li, Xuemei] Lanzhou Jiaotong Univ, Fac Geomat, Lanzhou 730070, Peoples R China; [Hou, Yunlong] Gansu Inst Engn Geol, Lanzhou 730000, Peoples R China; [Tai, Bowen] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Tian, Runze,Zhang, Yu,Xu, Anhua,et al. Impact of Cooling on Water and Salt Migration of High-Chlorine Saline Soils[J]. 中国科学院西北生态环境资源研究院,2021,2021.
APA	Tian, Runze,Zhang, Yu,Xu, Anhua,Li, Xuemei,Hou, Yunlong,&Tai, Bowen.(2021).Impact of Cooling on Water and Salt Migration of High-Chlorine Saline Soils.GEOFLUIDS,2021.
MLA	Tian, Runze,et al."Impact of Cooling on Water and Salt Migration of High-Chlorine Saline Soils".GEOFLUIDS 2021(2021).