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首页> 外文期刊>Journal of Applied Geophysics >Combining Electrical Resistivity Tomography and Ground Penetrating Radar to study geological structuring of karst Unsaturated Zone
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Combining Electrical Resistivity Tomography and Ground Penetrating Radar to study geological structuring of karst Unsaturated Zone

机译：结合电阻层析成像技术和探地雷达技术研究岩溶不饱和带的地质​​构造

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摘要

This paper highlights the efficiency and complementarity of a light package of geophysical techniques to study the structure of karst Unsaturated Zone (UZ) in typical Mediterranean environment where soil cover is thin or absent. Both selected techniques, 2D Ground Penetrating Radar (GPR) and Electrical Resistivity Tomography (ERT), are widely used in environmental studies and their application is accessible for a lot of scientists/engineers. However, GPR or ERT alone is not able to provide an enhanced characterization of geological features in karst media. In the present study, GPR results supply a near surface high resolution imaging and thus can provide relevant geological information such as stratifications and fractures. Despite the quality of the results GPR's investigation depth remains limited to around 12. m. Apparent and inverted resistivity provided by ERT surveys shows strong lateral and vertical variations. These variations can inform about general geological structuring and feature orientation. ERT is able to prospect down to 40. m but it's a low resolution integrative technique. In the study area the investigated limestone is a commonly electrical resistive formation (more than 2000 Ω.m). However deeper than 5-7. m, the ERT profiles reveal several zones of moderate resistivity (around 900. Ω.m). In these zones a stratification change corresponding to slanted bedding is clearly identified by GPR results. The combination of both GPR and ERT results can allow a well-established geological interpretation. These moderate resistivity zones with slanted beddings can explain the presence of a perennial water flow point 35. m below the surface of the studied site within the underground gallery of the Low-Noise Underground Laboratory (LSBB).
机译：本文着重介绍了一种轻型地球物理技术包的效率和互补性，以研究典型的地中海环境（土壤覆盖薄或没有土壤覆盖）中的喀斯特不饱和带（UZ）的结构。两种选定的技术，即2D探地雷达（GPR）和电阻率层析成像（ERT），都广泛用于环境研究中，并且它们的应用对于许多科学家/工程师而言都是可以访问的。但是，仅GPR或ERT不能提供岩溶介质中地质特征的增强特征。在本研究中，GPR结果提供了近地表高分辨率的成像，因此可以提供相关的地质信息，例如分层和裂缝。尽管结果质量良好，GPR的调查深度仍限制在约12 m。 ERT测量提供的视电阻率和反电阻率显示出很大的横向和垂直变化。这些变化可以告知一般的地质构造和特征定位。 ERT能够勘探到低至40.m的水，但这是一种低分辨率的整合技术。在研究区域中，所研究的石灰岩是一种常见的电阻岩层（大于2000Ω.m）。但是比5-7更深。 m，ERT曲线显示了几个中等电阻率区域（大约900.Ω.m）。在这些区域中，GPR结果清楚地识别出与倾斜的地层相对应的分层变化。 GPR和ERT结果的结合可以进行良好的地质解释。这些中等的电阻率带倾斜的层理区域可以解释在低噪声地下实验室（LSBB）地下通道内被研究地点的表面以下35. m处存在多年生水流点。

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