气候变化领域集成服务门户(CCPortal): Quantification of Water Content during Freeze Thaw Cycles: A Nuclear Magnetic Resonance Based Method

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DOI	10.2136/vzj2016.12.0124
	Quantification of Water Content during Freeze Thaw Cycles: A Nuclear Magnetic Resonance Based Method
	Tian, Huihui; Wei, Changfu; Lai, Yuanming; Chen, Pan
发表日期	2018
EISSN	1539-1663
卷号	17 期号:1
英文摘要	In analyzing the phase transition and water migration processes in multi-phase porous systems, it is helpful to properly evaluate the unfrozen capillary water content and adsorptive water content, respectively. In this study, an innovative procedure was developed to determine the total, adsorptive, and capillary water contents in frozen soils based on the nuclear magnetic resonance (NMR) technique. We found a threshold value of the proton spin-spin relaxation time, T-2, that separates the unfrozen pore water into two distinct regimes: the adsorptive regime for small T-2 values and the capillary regime for large T-2 values. We showed that the relationship between adsorptive (or capillary) water content and temperature is hysteretic for all three tested soils experiencing a freeze-thaw cycle. The hysteresis behavior of capillary or adsorptive water content during a freeze-thaw cycle is attributable to capillary effect, metastable nucleation, pore blocking, and variation of microstructure. In all the tested soils, the adsorptive water content was significantly larger than the capillary water content and was supported by the experimental evidence inferred from previous pore water potential measurements of various soils.
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Agriculture ; Water Resources
WOS类目	Environmental Sciences ; Soil Science ; Water Resources
WOS关键词	POROUS-MEDIA ; UNFROZEN WATER ; NMR ; POTENTIALS ; TEMPERATURE ; ADSORPTION ; BEHAVIOR ; ICE
WOS记录号	WOS:000439694100001
来源期刊	VADOSE ZONE JOURNAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239470
作者单位	[Tian, Huihui; Wei, Changfu; Chen, Pan] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Hubei, Peoples R China; [Lai, Yuanming] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Tian, Huihui,Wei, Changfu,Lai, Yuanming,et al. Quantification of Water Content during Freeze Thaw Cycles: A Nuclear Magnetic Resonance Based Method[J],2018,17(1).
APA	Tian, Huihui,Wei, Changfu,Lai, Yuanming,&Chen, Pan.(2018).Quantification of Water Content during Freeze Thaw Cycles: A Nuclear Magnetic Resonance Based Method.VADOSE ZONE JOURNAL,17(1).
MLA	Tian, Huihui,et al."Quantification of Water Content during Freeze Thaw Cycles: A Nuclear Magnetic Resonance Based Method".VADOSE ZONE JOURNAL 17.1(2018).