DEBRIS FLOW DETECTION USING REMOTE GROUND VIBRATION RECORDING BASED ON EXPERIMENTAL DATA

Abstract

 In order to detect the debris flow by observing the ground vibrations, the authors have been investigating the characteristics of ground vibrations induced by debris flow experiments. To detect the debris flow, it is common to attempt to receive large signals in the immediate vicinity of a steep mountain stream. However, it is not always possible to install the sensors under such advantageous conditions. Therefore, in this study, detecting the occurrence of debris flow based on the ground vibration obtained in the distant place from the source of debris flow was performed. Based on the ground vibration records observed in the debris flow experiments, ground vibration models focusing on the frequency characteristics were constructed. As a method of detecting debris flow, discrimination by the goodness-of-fit of this model with the observed record is proposed. Examination using experimental data demonstrated the effectiveness of the proposed method, including the avoidance of false detections for seismic ground motions.