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| | Abstract | | From a viewpoint of prevention of a slope disaster, it is important to detect the time change of water content in the slope spatially. We have conducted repeated monthly resistivity surveys since February, 2011, on the slope of an embankment in the large-scale rainfall simulator of the National Research Institute for Earth Science and Disaster Prevention (NIED). At this embankment, the measurements of near-surface soil water content and temperature have been conducted with the meteorological observation. The past measurement result shows that a long-term moisture change can be estimated by resistivity monitoring. This time, we brought artificial rain of precipitation 120mm for one hour on the embankment and we made continuous resistivity measurements. It is difficult to obtain the change of resistivity structure in real time because the analysis of resistivity structure requires measurement by much electrode combination. Therefore we performed only the measurement of Wenner array with a-spacing of 0.5 m. The result shows that a sudden change of the volumetric water content in the embankment can be estimated by the change of apparent resistivity. |
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