Mapping the boundaries of soil horizons using ground-penetrating radar

Q4 Agricultural and Biological Sciences
P. Ryazantsev
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Abstract

The article considers the role of GPR in solving problems of soil science, as well as the accuracy of tracking soil horizons using the example of field data. The study of the current state of the issue has shown that there is significant variability in the electrophysical properties of different types of soil. In this case, the dielectric constant of the soil horizons can both increase and decrease with depth. This fact determines the need for parameterization of the soil profile in GPR studies to prevent errors. Based on a generalizing analysis of practical examples, it has been established that the error in determining individual soil horizons by a GPR is on average 2–10 cm, depending on the frequency of the GPR antenna and the structural features of the soil. Experimental and methodological work to substantiate the main conclusions was carried out to trace the soil horizons by the GPR method using the example of typical entic podzol located on the Zaonezhsky Peninsula (Republic of Karelia), the structure and composition of which were described in detail earlier. The survey was carried out by a georadar OKO-2 (Logis-Geotech, Russia) with an antenna unit with a central frequency of 400 MHz. Fieldwork on the study site was carried out along separate transects, according to the reference soil profile. A detailed analysis of the radargrams provided, first of all, tracking the base of the BC horizon. The results obtained showed that the thickness of the soil within the profile varies from 23 to 32 cm, and the average observation error was ± 3 cm. Besides, the influence on the recording of shungite shale fragments and the differentiation of moisture content in the soil horizons was revealed. The presence of shungite shale leads to the formation of diffracted waves and an increase in the amplitudes of the reflected signal, while an increase in humidity is characterized by a decrease in the velocities of the electromagnetic wave.
利用探地雷达绘制土壤层的边界
本文考虑了探地雷达在解决土壤科学问题中的作用,以及利用野外数据跟踪土层的准确性。对该问题现状的研究表明,不同类型土壤的电物理性质存在显著差异。在这种情况下,土层的介电常数可以随着深度的增加和减少。这一事实决定了在地质雷达研究中对土壤剖面进行参数化以防止误差的必要性。基于对实例的概括分析,已经确定,根据探地雷达天线的频率和土壤的结构特征,通过探地雷达确定单个土层的误差平均为2-10厘米。为了证实主要结论,我们进行了实验和方法学工作,以位于Zaonezhsky半岛(卡累利阿共和国)的典型的全体灰阶为例,通过探地雷达法追踪土层,其结构和成分已在前面详细描述。该调查由georadar OKO-2(俄罗斯Logis Geotech)进行,天线单元的中心频率为400 MHz。根据参考土壤剖面,研究现场的实地调查是沿着单独的样带进行的。首先,对雷达图进行了详细分析,追踪了不列颠哥伦比亚省地平线的底部。结果表明,剖面内的土壤厚度在23~32cm之间,平均观测误差为±3cm。此外,还揭示了对顺土页岩碎片记录和土层含水量分化的影响。顺土页岩的存在导致衍射波的形成和反射信号振幅的增加,而湿度的增加以电磁波速度的降低为特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
0.90
自引率
0.00%
发文量
15
审稿时长
8 weeks
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