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| | Abstract | | Capacitively coupled resistivity (CCR) measurement has been used for estimating resistivity structure, particularly on river levees. One of the advantages of this measurement is a capability of a continuous data acquisition. One-dimensional analysis has been applied in many cases to reduce time and cost for the data analysis of CCR. However, two- or three-dimensional analysis is now feasible due to an improvement in computation power. Thus, a practical method of two- or three-dimensional analysis for the CCR measurement is discussed in this study. First, the sensitivity distribution of the dipole-dipole array configuration using line electrodes is calculated by COMSOL Multiphysics. Then, the sensitivity is compared to that of point electrodes located at the center of each line electrodes. Since the two sensitivity distributions are similar, the resistivity measurement by the line electrodes is approximated as the resistivity measurement by the point electrodes. The approximation is validated by a three-dimensional numerical simulation and a two-dimensional field observation. As a result, we concluded that two- or three-dimensional subsurface resistivity model can be effectively obtained by using CCR measurement with this approximation method. |
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