| 探地雷达波振幅与土壤含水量关系的数值模拟 |
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| 引用本文： | 李蕙君,钟若飞. 探地雷达波振幅与土壤含水量关系的数值模拟[J]. 应用科学学报, 2015, 33(1): 41-49. DOI: 10.3969/j.issn.0255-8297.2015.01.005 |
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| 作者姓名： | 李蕙君 钟若飞 |
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| 作者单位： | 1. 首都师范大学资源环境与地理信息系统北京市重点实验室，北京100482. 首都师范大学城市环境过程与数字模拟国家重点实验室培育基地，北京100483. 首都师范大学三维信息获取与应用教育部重点实验室，北京100048 |
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| 基金项目： | 国家科技支撑计划课题基金(No.2012BAH34B01);国家自然科学基金(No.41371434)资助 |
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| 摘 要： | 通过建立探地雷达波振幅与土壤介电常数之间的定量关系可反演土壤含水量. 在采用时间域有限差分法建立土壤分层模型的基础上，模拟探地雷达电磁波在均匀分层土壤介质中的传播特性，分析土壤介电常数与雷达回波振幅之间的变化规律，证实了回波振幅随着介电常数的增大而减小，总结出介电常数与振幅之间的幂函数关系式. 最后通过室内土壤模型对此关系式进行了验证，结果表明由此关系式反演出的土壤含水量值与土壤三参数仪测定的含水量值相一致.
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| 关 键 词： | 含水量 探地雷达 数值模拟 |
| 收稿时间： | 2014-12-02 |
| 修稿时间： | 2014-12-28 |
Numerical Study on the Relationship between Amplitudes of Ground Penetrating Radar Wave and Water Content in Soil |
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| LI Hui-jun;ZHONG Ruo-fei. Numerical Study on the Relationship between Amplitudes of Ground Penetrating Radar Wave and Water Content in Soil[J]. Journal of Applied Sciences, 2015, 33(1): 41-49. DOI: 10.3969/j.issn.0255-8297.2015.01.005 |
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| Authors: | LI Hui-jun ZHONG Ruo-fei |
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| Affiliation: | LI Hui-jun;ZHONG Ruo-fei;State Key Laboratory Incubation Base of Urban Environmental Processes and Digital Simulation,Capital Normal University;Beijing Key Laboratory of Resource Environment and Geographic Information System,Capital Normal University;Key Laboratory of 3D Information Acquisition and Application,Ministry of Education,Capital Normal University; |
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| Abstract: | Water content in soil can be derived from the relation between changes in ground penetrating radar signals and the soil’s dielectric constant. Using the finite difference time domain (FDTD) method, a model of layered soil is established to simulate ground penetrating radar electromagnetic waves in the soil. The transmission characteristics of layered soil are analyzed using the model. The results indicate that a functional relation exists between the soil dielectric constant and the amplitude, i.e., the wave amplitude decreaseswith the increased electric constant. With an indoor soil model, the obtained relationship
is verified: the computed water content agrees with the wet sensor data.
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| Keywords: | water content in soil ground penetrating radar numerical simulation |
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