| 温度对土壤介电常数的影响规律研究北大核心CSCD |
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| 引用本文： | 杜玉霞,明锋,赵淑萍,张淑娟,杨旭.温度对土壤介电常数的影响规律研究北大核心CSCD[J].冰川冻土,2022,44(2):634-642. |
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| 作者姓名： | 杜玉霞 明锋 赵淑萍 张淑娟 杨旭 |
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| 作者单位： | 1.中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室，甘肃 兰州 730000;2.南京师范大学 地理科学学院 虚拟地理环境教育部重点实验室，江苏 南京 210023;3.中石化第五建设有限公司，甘肃 兰州 730060 |
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| 基金项目： | 国家自然科学基金项目(41801041);中国科学院关键技术人才项目（张淑娟）;中国科学院青年创新促进会项目(2021426) |
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| 摘 要： | 介电常数是频域反射法测定土样含水率的关键参数之一。为获取温度对土壤介电常数的影响规律,利用矢量网络分析仪测得不同含水率、含盐量的试样在不同试验温度下的介电常数。通过分析土样介电常数随不同因素的变化规律,最后建立了介电常数与温度的关系。结果表明:温度对土样介电常数的影响主要表现在冰水剧烈相变阶段。当温度低于某一温度或者高于冻结温度后,介电常数受温度的影响较小。负温条件下,土样介电常数随含盐量增大而增大。引入阶梯函数建立的三阶段模型,可有效描述土样介电常数随温度的变化规律。
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| 关 键 词： | 冻土 融化过程 介电常数 频域反射 预测模型 |
| 收稿时间： | 2022-02-22 |
| 修稿时间： | 2022-03-30 |
Investigation on the influence of temperature on soil dielectric constant |
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| Yuxia DU,Feng MING,Shuping ZHAO,Shujuan ZHANG,Xu YANG.Investigation on the influence of temperature on soil dielectric constant[J].Journal of Glaciology and Geocryology,2022,44(2):634-642. |
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| Authors: | Yuxia DU Feng MING Shuping ZHAO Shujuan ZHANG Xu YANG |
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| Institution: | 1.State Key Laboratory of Frozen Soil Engineering，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China;2.Key Laboratory of Virtual Geographic Environment of Ministry of Education，School of Geographic Science，Nanjing Normal University，Nanjing 210023，China;3.Sinopec Fifth Construction Co. LTD，Lanzhou 730060，China |
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| Abstract: | The dielectric constant is one of the key parameters for measuring soil moisture content through the frequency domain reflection method. To obtain the influence of temperature on soil dielectric constant， the vector network analyzer was used to test the dielectric constant of soil samples with different water contents and salt contents at different temperatures. By analyze the change law of soil dielectric constant with different factors， a step function was introduced to describe the relationship between dielectric constant and temperature. The results show that through the water-ice phase change， the temperature controls the soil dielectric constant. When the temperature is lower than a certain temperature or higher than freezing point， the dielectric constant is less affected by temperature. The dielectric constant has a great change in the severe phase of ice-water transformation. The dielectric constant of soil increases with the increase of salt content. The increase of initial water content will increase the dielectric constant. A three-stage model based on step function can be well describe influence of temperature on the soil dielectric constant. |
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| Keywords: | frozen soils thawing process dielectric constant frequency domain reflection prediction model |
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