| 时域反射仪在监测青藏高原活动层水分变化过程中的应用 |
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| 引用本文： | 王绍令,杨梅学,小池俊雄,赵林.时域反射仪在监测青藏高原活动层水分变化过程中的应用[J].冰川冻土,2000,22(1):78-84. |
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| 作者姓名： | 王绍令 杨梅学 小池俊雄 赵林 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所青藏高原综合观测研究站!甘肃兰州73000(王绍令，赵林)，中国科学院寒区旱区环境与工程研究所冰芯与寒区环境开放实验室!甘肃兰州 73000(杨梅学)，日本长岗科技大学环境建设系!日本940-21(小池俊雄) |
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| 摘 要： | 时域反射仪（ＴＤＲ）是一种利用电磁脉冲方法，根据电磁波在土层中的传播速度测试不同土层 的介电常数，接介电常数值可获不同土类在冻融状态下的未冻水含量和总体积含水量．ＴＤＲ仪可在 野外环境下无破损地测得融土和冻土的液态水含量，尤其是能测出不同负温下冻土中未冻水的变 化．该仪器最适用于测量均质细颗粒土的体积含水量，经与烘干称重法对比，ＴＤＲ仪应用在青藏高 原上不同融土类所测含水量值的误差范围：粉土和细砂为±２．５％，粘土和亚粘土为±３．０％，砂砾石 土和碎石土为±５％．经过反复的野外实践证明，用 ＴＤＲ仪测上层含水量具有简便、快速及稳定等 优点，是值得推广的方法．根据青藏公路沿线８个场地埋置的ＴＤＲ仪和地温仪所获的一个年周期的 水、热资料（１９９７．８～１９９８．７），分析了高原活动层在冻融过程中温度场和水分场的耦合所导致的水分迁移及水分场重分布的规律
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| 关 键 词： | 时域反射仪 体积含水量 水分迁移 活动层 冻土 |
Application of Time-Domain-Refiectometer to Researching Moisture Variation in Active Layer on the Tibetan Plateau |
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| WANG Shao-ling,YANG Mei-xue,Toshio KOIKE,ZHAO Lin.Application of Time-Domain-Refiectometer to Researching Moisture Variation in Active Layer on the Tibetan Plateau[J].Journal of Glaciology and Geocryology,2000,22(1):78-84. |
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| Authors: | WANG Shao-ling YANG Mei-xue Toshio KOIKE ZHAO Lin |
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| Abstract: | Using electromagnetic pulses, Time-Do- main-Reflectometer (TDR) soil moisture is deter- mined by measuring dielectric constant for different soil layers. TDR can be used to determine the liquid water content of soils in unbroken state in field, specially the unfrozen water content of frozen soils in different temperatures. It is more suitable to measure bulk moisture content of finegrained soils. Compared with gravitational method, the accuracy of TDR in de- termination of bulk moisture content on the Tibetan Plateau is: ± 2.5% for silt and fine grained sand, ±3.0% for clay and sandy clay and ±5% for gravel and pebble soils. It can be concluded by repeated field practices that there are many advantages of TDR in determination of soil moisture contents in field, I.e., simple, convenient and quick for field measuring and stable in the measuring results. Based on the moistrue and temperature data (August 1997 to August 1998) from 8 sites along the Tibetan Highway, the moisture migration in the active layer due to freezing is ana- lyzed in this paper. |
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| Keywords: | Time-Domain-Reflectometer bulk moisture content moisture migration |
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