2022 Volume 78 Issue 4 Pages 355-368
The purpose of this study is to clarify the relationship between the light intensity measured by a plastic optical fiber moisture detection sensor (RR sensor) and the volumetric moisture content measured by a soil moisture meter. The results of watering experiments using an optical information processing application for portable devices and soil columns indicate that the progression of the ground from a quasi-saturated state to a saturated state can be determined by measuring the light intensity. The rate of decrease in light intensity was found to increase near the point where the quasi-saturated volumetric water content was exceeded. These results suggest that the results of light intensity measurements in the ground by the RR sensor can be used to evaluate the risk of slopes.
