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时间:2019-01-24 14:26来源:未知 作者:anne 点击:
作者介绍了探地雷达作为一种遥感技术,利用无线电波提供了地下的详细地图,无线电波是在地表以上产生的。 GPR的主要优点是无损检测与自然或人工子表面变化相关的垂直和水平介电异常。另外,GPR可以与多技术方法中的其他技术结合使用。因此,探地雷达已被用于各个领域,包括考古学,环境科学和地球科学。在地球科学中,探地雷达是一种利用电磁(EM)波形图像结构和地下埋藏特征的地球物理方法。背后的基本原理是埋藏靶和背景材料(土壤,水和岩石)的介电常数不同,并且可以观察到可归因于各种因素的介电对比度。在不同的地下物体之间存在可检测的介电对比度的情况下,可以在GPR图像上清楚地识别强信号反射。
作者进行了两个关于雷达调查的案例研究,旨在绘制根系图。第一个案例是对当地公园树根的GPR测量。使用双静态GPR系统对40m x10区域进行了调查,并进行了多次测量Ygrid(总共20条平行线)的测量,线间距为0.50m,步长为0.05m。案例是在罗马当地一所大学的修道院中,对埋藏残留根的GPR调查,仍然存在于一棵大树被拆除的地区。该调查是通过双静态500 MHz Noggin Plus GPR系统实现的。通过收集多轮廓Y网格(总共26条平行线)研究了14 m x12 marea,线间距为0.50m,步长为0.02m。
总之,由于其非侵入性和实时数据采集,GPR作为遥感技术的潜力应用于地球科学。将来,应该考虑这种技术的经济价值。设备成本适中,加上大面积的快速采集时间,使GPR在地质应用中具有很强的竞争力。According to the journal, two radar surveys aimed atreconstructing the geometric features of root systems buried at shallow subsurface were conducted using Ground Penetrating Radar (GPR), a non-invasiveremote-sensing technique that has gained increasing popularity and wide application in archaeology,engineering and environmental sciences. The results illustrate that GPR is an ideal reconnaissance method before performing any destructive test, thus having a great potential for practical applications.
The author introduced GPR as a remote sensing technique providing a detailedmap of the subsurface using radio waves,which are generatedjust above the ground surface. The main advantage of GPR is the non-destructive detection of vertical and horizontal dielectric anomalies associated with natural or manmadesubsurface variability. Additionally, GPR can be used in combination with other techniques in a multi-technique approach. Therefore, GPR has been used in various fields, including archaeology,environmental science and geoscience.In geoscience, GPR is a geophysical method which uses electromagnetic (EM) wavesto image structures and features buried underground. The basic principle behind isthat the dielectric constants ofthe buried target and the backgroundmaterial (soil, water and rocks) are differentand a dielectric contrast, which can be attributed to various factors, will be observed. In cases that there is a detectable dielectric contrast between different subsurface objects, strong signal reflectionscan be clearly identified on a GPR image.
The author performedtwo case studies about the radar investigations aimed at mappingthe root system are presented.The first case is a GPR survey of tree roots in a local park. The 40m x10marea was investigatedusing a bi-static GPR system and the survey was performed acquiring a multi-profile Ygrid (for a total of 20 parallel lines), with a line spacing of 0.50m and a step-size of0.05m.The second case is a GPR survey of buried residual roots, still present in an area where a big tree waspreviously removed,in thecloister of a local university in Rome. This survey is achieved bya bi-static 500 MHz Noggin Plus GPR system. The14 m x12 marea wasinvestigated by collecting a multi-profile Y grid (for a total of 26 parallel lines) with a linespacing of 0.50m and a step-size of 0.02m.
In conclusion, the potentials of GPR as remote-sensing techniqueapplied to geoscience, in virtue of its non-invasive nature and real-time data acquisition. In the future, some considerations should be made on the economic value of this technique. The moderate cost of the equipment, together with the fast acquisition time in large areas, makes GPR quite competitive for geological applications.

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