|
| | 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 two 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). The results clearly show seasonal changes in the resistivity structure of the embankment, with resistivity becoming low in the summer wet season and high in the winter dry season. It is obvious that the long-term resistivity change is greatly affected by the temperature change. This means that the temperature correction to resistivity is required in order to estimate the water content change from the resistivity change. Therefore we measured the temperature dependency of the resistivity of the soil samples extracted from the embankment. As a result, the empirical formula of the linear relation between resistivity and temperature was acquired. We confirmed that the resistivity corrected using the formula have a linear relation to the water content. This indicates that resistivity monitoring is effective for monitoring changes in water content in the slope of an embankment. |
|
|
|
| |
|