Forestry applications of ground-penetrating radar
Forestry applications of ground-penetrating radar
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DOI：
10.5424/fs/2010191-01163
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发表时间：
2010-04-01
期刊：
影响因子：
0.7
通讯作者：
Armesto, J.
中科院分区：
文献类型：
--
作者：
Lorenzo, H.;Perez-Gracia, V.;Armesto, J.
探地雷达（GPR）是一种地球物理和近距离遥感技术，基于使用雷达脉冲来获得地下特征的横截面图像。该方法的特征在于传输电磁短脉冲（1 - 2 ns），其中心频率范围为10 MHz至2.5 GHz。探地雷达的工作原理是基于低频雷达波穿透非导电介质的能力，通常是底土，也可以是墙壁、混凝土或木材。这些波在传播介质的电磁不连续性中经历反射之后被检测到。因此，这是一种合适的方法来研究这些物理特性的变化，也可以表征不同的介质和反射目标，提供有关其物理特性的信息。这项工作的目的是描述和展示不同的应用地质雷达在林业，显示所获得的结果与他们的解释。首先，在本文中，它是如何说明地质雷达能够映射浅基岩，底土地层，也估计浅地下水位深度。其次，不同的树干，以及干木材进行了分析，评估在每个特定的情况下获得的不同的雷达数据，并观察其电磁特性的差异相关的探地雷达响应。最后，采取了几项措施，以分析使用探地雷达探测树根系统，使用极化技术，有可能检测中，大尺寸的根，以及小根组。
Ground-penetrating radar (GPR) is a geophysical and close-range remote sensing technique based on the use of radar pulses to obtain cross-section images of underground features. This method is characterized by the transmission of an electromagnetic short length pulse (1-2 ns), presenting a centre frequency ranging from 10 MHz to 2.5 GHz. The principles of GPR operation are based on the ability of low frequency radar waves to penetrate into a non-conductive medium, usually subsoil, but also walls, concrete or wood. Those waves are detected after suffering a reflection in electromagnetic discontinuities of the propagation medium. Therefore, this is a suitable method to study changes in those physical properties, and also to characterize different mediums and the reflective targets providing information about their physical properties. The aim of this work is to describe and demonstrate different applications of GPR in forestry, showing the obtained results together with their interpretation. Firstly, in this paper, it is illustrated how GPR is able to map shallow bedrock, subsoil stratigraphy and also to estimate shallow watertable depth. Secondly, different tree trunks as well as dry timber are analyzed, evaluating the different radar data obtained in each particular case, and observing differences in their electromagnetic properties related to the GPR response. Finally, several measurements were taken in order to analyze the use of GPR to detect tree root systems using polarimetric techniques, being possible to detect medium and big size roots, together with groups of small roots.