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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 for four years 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). We also conducted the artificial rain experiments at the embankment, controlling the total amount and intensity of rainfall and observed continuously the subsurface resistivity change during the rainfalls. It seems that rough long-term changes of subsurface moisture content can be estimated by geoelectrical monitoring in conjunction with temperature correction. The geoelectrical monitoring is also effective for observing soil moisture changes caused by heavy rain in real time, although the detection of local moisture changes is difficult. |
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