Abstract
This paper proposes a capacitance CT technique with two sets of in-line electrodes arranged in parallel to evaluate soil-water distribution under the ground and numerical simulation is carried out to verify the possibility of measuring the soil-water distribution. Volumetric water content is used as an index to estimate the wet state in soil to solve mechanism of landslides in research. The proposed CT technique can be applied to the measurement of volumetric water content without interfering the water penetration into the measuring region. The Laplace equation for electric potential is solved by a finite difference method to evaluate the capacitance under the Gauss’ law in numerical simulation. From the simulation results, it is found that the soil-water distribution can be successfully estimated for various sizes and numbers of water elements in soil. Furthermore, it is confirmed that the permittivity estimated by the present capacitance CT corresponds to the given volumetric water content.
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