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首页> 外文期刊>International Journal of Geosciences >GPR Tomographic Imaging of Concrete Tubes and Steel/Plastic Tanks Buried in IAG/USP Geophysical Test Site, Brazil
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GPR Tomographic Imaging of Concrete Tubes and Steel/Plastic Tanks Buried in IAG/USP Geophysical Test Site, Brazil

机译：GPR断层切断成像混凝土管和钢/塑料罐埋在IAG / USP地球物理测试网站，巴西

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In this paper, the Ground Penetrating Radar (GPR) method was used to characterize concrete tubes and steel/plastic tanks buried in IAG/USP test site. The microwave tomography was used to improve the GPR images, aiming to retrieve the geometry of the targets. The numerical modeling studies also were done in order to predict the GPR results of the buried targets and to give more reliability to the results interpretation. The targets were installed in the first shallow geophysical test site of the Brazil located at Institute of Astronomy, Geophysics, and Atmospheric Science (IAG) of the University of S?o Paulo (USP). GPR profiles of 200 MHz (shielded bistatic antennas) were acquired along three lines containing concrete tubes and steel/plastic tanks buried in subsoil. The concrete tubes show a hyperbolic reflector for the top, and the vertical tube also presented a reflection on its bottom. The horizontal steel tanks were characterized by a strong GPR reflection on their top. The empty plastic tank shows a strong reflector for the top with normal polarity. On the other hand, the plastic tank filled with water shows a weaker reflector for its top characterized by the inverted polarity of GPR signal when compared with empty plastic tank. The plastic tank filled with water also went characterized by the strong reflection to its bottom, being a good indicative to interpret GPR data on target in subsoil with some types of fluid inside of tank. The results of polarity difference for the top of tank can be used as guide pattern to identify buried tank empty or filled with water. The application of microwave tomography to the GPR data permitted to determine the position and get a good identification of the edges of the targets studied. The numeric modeling presented a good accordance with real data reducing the ambiguities in interpretation of results. These results can be used as a reference, and they can be extrapolated for areas where there is no subsurface information.
机译：本文采用地面穿透雷达（GPR）方法在IAG / USP试验部位埋入的混凝土管和钢/塑料箱。微波断层扫描用于改善GPR图像，旨在检索目标的几何形状。还完成了数值建模研究，以预测埋地目标的GPR结果并对结果解释提供更多可靠性。目标是在巴西的第一个浅层地球物理测试场所安装，位于S？O Paulo大学（USP）的天文学研究所，地球物理和大气科学（IAG）。沿着含有在底土的混凝土管和钢/塑料箱的三条线获得200MHz（屏蔽双向天线）的GPR型材。混凝土管显示顶部的双曲线反射器，垂直管也呈现在其底部的反射。水平钢罐的特点是其顶部的强大的GPR反射。空塑料罐显示顶部的强反射器，具有正常极性。另一方面，填充有水的塑料箱表示其顶部的较弱反射器，其特征在于与空塑料箱相比时GPR信号的倒置极性。充满水的塑料箱也以强烈的反射特征在于其底部的强烈反射，是在坦克内部的某种类型的液体中解释底层的靶靶标的GPR数据。罐顶部的极性差异的结果可以用作导向图案，以识别埋地罐空或充满水。将微波断层扫描应用于允许的GPR数据确定位置并获得所研究目标的边缘的良好识别。数字建模提出了一种良好的真实数据，减少了对结果解释的歧义。这些结果可以用作参考，并且可以在没有地下信息的区域推断。

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