Simultaneous measurement of unfrozen water content and ice content in frozen soil using gamma ray attenuation and TDR (SCI)
文献类型：期刊论文
| 作者 | Zhou X. H. ; Zhou J. ; Kinzelbach W. ; Stauffer F. |
| 刊名 | Water Resources Research
 |
| 出版日期 | 2014 |
| 卷号 | 50期号:12页码:9630-9655 |
| 英文摘要 | The freezing temperature of water in soil is not constant but varies over a range determined by soil texture. Consequently, the amounts of unfrozen water and ice change with temperature in frozen soil, which in turn affects hydraulic, thermal, and mechanical properties of frozen soil. In this paper, an Am-241 gamma ray source and time-domain reflectometry (TDR) were combined to measure unfrozen water content and ice content in frozen soil simultaneously. The gamma ray attenuation was used to determine total water content. The TDR was used to determine the dielectric constant of the frozen soil. Based on a four-phase mixing model, the amount of unfrozen water content in the frozen soil could be determined. The ice content was inferred by the difference between total water content and unfrozen water content. The gamma ray attenuation and the TDR were both calibrated by a gravimetric method. Water contents measured by gamma ray attenuation and TDR in an unfrozen silt column under infiltration were compared and showed that the two methods have the same accuracy and response to changes of water content. Unidirectional column freezing experiments were performed to apply the combined method of gamma ray attenuation and TDR for measuring unfrozen water content and ice content. The measurement error of the gamma ray attenuation and TDR was around 0.02 and 0.01 m(3)/m(3), respectively. The overestimation of unfrozen water in frozen soil by TDR alone was quantified and found to depend on the amount of ice content. The higher the ice content, the larger the overestimation. The study confirmed that the combined method could accurately determine unfrozen water content and ice content in frozen soil. The results of soil column freezing experiments indicate that total water content distribution is affected by available pore space and the freezing front advance rate. It was found that there is similarity between the soil water characteristic and the soil freezing characteristic of variably saturated soil. Unfrozen water content is independent of total water content and affected only by temperature when the freezing point is reached. |
| 收录类别 | SCI |
| 公开日期 | 2015-12-24 |
| 源URL | [http://ir.casnw.net/handle/362004/24850]  |
| 专题 | 寒区旱区环境与工程研究所_中科院寒区旱区环境与工程研究所（未分类）_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhou X. H.,Zhou J.,Kinzelbach W.,et al. Simultaneous measurement of unfrozen water content and ice content in frozen soil using gamma ray attenuation and TDR (SCI)[J]. Water Resources Research,2014,50(12):9630-9655. |
| APA | Zhou X. H.,Zhou J.,Kinzelbach W.,&Stauffer F..(2014).Simultaneous measurement of unfrozen water content and ice content in frozen soil using gamma ray attenuation and TDR (SCI).Water Resources Research,50(12),9630-9655. |
| MLA | Zhou X. H.,et al."Simultaneous measurement of unfrozen water content and ice content in frozen soil using gamma ray attenuation and TDR (SCI)".Water Resources Research 50.12(2014):9630-9655. |
入库方式： OAI收割
来源：寒区旱区环境与工程研究所
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