Characterization and Quantification of Pore Water in Clays During Drying Process With Low-Field NMR
文献类型：期刊论文
| 作者 | Tian, H. H.2; Wei, C. F.1,2 |
| 刊名 | WATER RESOURCES RESEARCH
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 56期号:10页码:15 |
| ISSN号 | 0043-1397 |
| 关键词 | soil‐ water interaction water dynamics NMR surface relaxivity microstructure |
| DOI | 10.1029/2020WR027537 |
| 英文摘要 | Water transport in large-specific surface soil is controlled by soil microstructure and soil-water interaction. In this paper, soil-water interaction and confined water dynamics as well as soil microstructure are studied by combining the nuclear magnetic resonance technique and the mercury intrusion porosimetry. It is revealed that during a drying process pore water drainage occurs sequentially from larger pores to smaller pores, and surface interaction parameter rho(1) appears to be a well-defined quantity at a water content above one water layer, below which rho(1) shows a different trend. With the two-dimensional T-1-T-2 correlation measurements, surface dynamical parameters, including residence time and surface affinity coefficient, are determined, showing that the mobility of pore water decreases gradually with the decrease in water potential. The effect of temperature on the soil-water interaction is discussed via the variation of relaxation time with temperature. The increase in residence time and surface affinity coefficient as well as effective activation energy Delta E indicates that the mobility of pore water decreases with the decrease in water potential. In addition, the positiveness of Delta E indicates that unsaturated hydraulic conductivity of clay increases with temperature, and a larger Delta E implies that the unsaturated hydraulic conductivity for the sample equilibrated at smaller potential is more sensitive to the temperature. The average pore sizes of the saturated samples are also determined by the mercury intrusion porosimetry, showing clear consistency between the mercury intrusion porosimetry (MIP) and nuclear magnetic resonance (NMR) measurements. |
| 资助项目 | National Science Foundation of China (NSFC)[51939011] ; National Science Foundation of China (NSFC)[51639008] ; National Science Foundation of China (NSFC)[41502301] ; Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin University of Technology |
| WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000586456800008 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/25025]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Wei, C. F. |
| 作者单位 | 1.Guilin Univ Technol, Guangxi Key Lab Geomech & Geotech Engn, Guilin, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tian, H. H.,Wei, C. F.. Characterization and Quantification of Pore Water in Clays During Drying Process With Low-Field NMR[J]. WATER RESOURCES RESEARCH,2020,56(10):15. |
| APA | Tian, H. H.,&Wei, C. F..(2020).Characterization and Quantification of Pore Water in Clays During Drying Process With Low-Field NMR.WATER RESOURCES RESEARCH,56(10),15. |
| MLA | Tian, H. H.,et al."Characterization and Quantification of Pore Water in Clays During Drying Process With Low-Field NMR".WATER RESOURCES RESEARCH 56.10(2020):15. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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