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首页> 外文期刊>American journal of applied sciences >EFFECTS OF ELECTRODE SPACING AND INVERSION TECHNIQUES ON THE EFFICACY OF 2D RESISTIVITY IMAGING TO DELINEATE SUBSURFACE FEATURES
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EFFECTS OF ELECTRODE SPACING AND INVERSION TECHNIQUES ON THE EFFICACY OF 2D RESISTIVITY IMAGING TO DELINEATE SUBSURFACE FEATURES

机译：电极间距和反演技术对二维电阻率成像描述地下特征的影响

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In this study, the effect of the choice of appropriate electrode spacing and inversion algorithms on the efficacy of 2D imaging to map subsurface features was investigated. The target being investigated was the drainage concrete pipe buried at approximately 0.3 m into the subsurface. A profile perpendicular to the strike of the pipe was established. 2D resistivity data was separately collected with the electrode spacings of 1.5 m and 0.5 m. using the Dipole-Dipole, the Wenner and the Wenner-Schlumberger array configurations. The results obtained showed that when the electrode spacing of 1.5 m was used for the investigations, none of the three array types was able to map the target with either of the two inversion techniques. The results further show that the attainment of RMS error of less about 10% which usually gives the indication of a good subsurface model is not a guarantee that subsurface features are successfully mapped. On the other hand, when the electrode spacing of 0.5 m was used for the data collection, the results obtained with the standard constrains inversion technique showed that all the three array configurations mapped the target however, only the dipole-dipole array was able to resolve the boundary between the concrete pipe and the entrapped air. With the robust constrain inversion technique; the target was also successfully mapped by all the three array types. In addition to this, the boundary between the entrapped air and the concrete pipe was resolved by all the three array types. This suggests that if there is a significant contrast in the subsurface layers' resistivities, the robust constrain inversion algorithm technique gives better boundaries resolution irrespective of the array types used for the survey. The inversion of the 3D data gave 3D resistivity sections which were presented as horizontal depth slices. The result obtained from the inversion of the 3D data has assisted us in getting information about the dimension and orientation of the target. The study revealed that a miniature subsurface feature can only be effectively delineated if the feature is not deeply buried into the subsurface.
机译：在这项研究中，研究了选择合适的电极间距和反演算法对2D成像绘制地下特征的效果的影响。研究的目标是埋在地下约0.3 m处的排水混凝土管。建立垂直于管道走向的轮廓。分别采集电极间距为1.5 m和0.5 m的2D电阻率数据。使用偶极子-偶极子，Wenner和Wenner-Schlumberger阵列配置。获得的结果表明，当使用1.5 m的电极间距进行研究时，三种阵列类型均无法使用两种反演技术中的任一种来绘制目标。结果进一步表明，获得的RMS误差通常小于10％，这通常表明存在良好的地下模型，但这并不能保证成功映射地下特征。另一方面，当电极间距为0.5 m进行数据收集时，使用标准约束反演技术获得的结果表明，所有三个阵列配置都映射了目标，但是，只有偶极-偶极阵列能够解析混凝土管与残留空气之间的边界。采用强大的约束反演技术；该目标也已通过所有三种数组类型成功映射。除此之外，所有这三种阵列类型都解决了夹带的空气和混凝土管之间的边界。这表明，如果地下层的电阻率存在显着差异，则稳健的约束反演算法技术将提供更好的边界分辨率，而与勘测所使用的阵列类型无关。 3D数据的反演给出了3D电阻率截面，这些截面表示为水平深度切片。从3D数据反演获得的结果已帮助我们获得有关目标尺寸和方向的信息。研究表明，只有在未将微型地下特征深深地埋入地下的情况下，才能有效地对其进行描绘。

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