| 冻融过程对FDR测量土壤体积含水量的影响 |
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| 引用本文： | 张爱莉,高磊.冻融过程对FDR测量土壤体积含水量的影响[J].排灌机械工程学报,2013,31(4):364-368. |
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| 作者姓名： | 张爱莉 高磊 |
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| 作者单位： | (1. 北京工业大学艺术设计学院, 北京 100029; 2. 河海大学土木与交通学院, 江苏 南京 210098; 3. 南京大学地球科学与工程学院, 江苏 南京 210093) |
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| 基金项目： | 中央高校基本科研业务费专项资金资助项目(2012B02314);中国博士后科学基金资助项目(2012M511193);江苏省博士后科研资助计划项目(1102073C) |
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| 摘 要： | 为研究冻融过程对FDR测量土壤体积含水量的影响,采用基于FDR技术的土壤水分传感器TDR-3,通过室内温度实验箱控制环境温度范围为-20～20 ℃,对冻融过程中黏性土样体积含水量进行了测试分析．结果表明:采用FDR测量黏性土样体积含水量,在土样未进行冻融前,温度在0 ℃以上时,FDR的测量值随温度呈线性变化,随着温度的升高而增大,随着温度的降低而减小;黏性土样冻融过程中,在冻结过程中,FDR的测量值随着温度的降低逐渐减小;在融化过程中,随着温度的升高,FDR的测量值逐渐增大;相同温度条件下,黏性土冻结过程中FDR的测量值明显大于黏性土融化过程中FDR的测量值,0℃时两者差值最大,该差值受土壤初始体积含水量和冻融温度的影响．研究成果对于提高FDR测量冻融过程中土壤体积含水量的可靠性具有重要意义．
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| 关 键 词： | 土壤 频域反射技术 冻融过程 土壤水分传感器 体积含水量 |
| 收稿时间： | 2013-03-06 |
Effect of freezing and thawing process on FDR′s measuring volumetric water content of soil |
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| Zhang Aili,Gao Lei.Effect of freezing and thawing process on FDR′s measuring volumetric water content of soil[J].Journal of Drainage and Irrigation Machinery Engineering,2013,31(4):364-368. |
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| Authors: | Zhang Aili Gao Lei |
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| Institution: | (1.College of Art and Design, Beijing University of Technology, Beijing 100029,China; 2.School of Civil Engineering and Transportation, Hohai University, Nanjing, Jiangsu 210098, China; 3.School of Earth Sciences and Engineering, Nanjing University, Nanjing,Jiangsu 210093, China) |
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| Abstract: | In order to study the effect of freezing and thawing process on FDR(frequency domain reflectometry)′s measuring volumetric water content of soil, the TDR-3 soil moisture sensor, based on FDR, was used to measure volumetric water content of soil at different temperatures ranged between -20-20 ℃, controlled by the temperature box in laboratory. The results show that, before freezing process above 0℃, during thawing process, the volumetric water content of soil measured by FDR increases or decreases as the temperature increases or decreases; the volumetric water content of soil, measured by FDR, decreases as temperature decreases during freezing process; and increases as temperature increases during thawing process. At the same temperature, the volumetric water content of soil measured during freezing process is higher than that measured during thawing process; at 0 ℃, the difference between them is maximal, which is significantly affected by the initial volumetric water content of soil and temperature. The results are valuable for improving the reliability of measuring the vo lumetric water content of soil by applying FDR in freezing and thawing process. |
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| Keywords: | soil frequency domain reflectometry freezing and thawing process soil moisture sensor volumetric water content |
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