Calibration of infrasound monitoring system and acoustic characteristics of debris-flow movement by field studies
Naturally occurring infrasounds produced by debris flows are explored in this study by examining the field data both in Jiangjia Gully, Yunnan and Houyenshan, Taiwan, respectively. Infrasound propagates to long distance in the atmosphere at the speed of sound for the low adsorption in the air and the high reflectivity of the ground. The infrasonic signals induced by debris flows are related to the magnitude and composition of the failure zone as well as the slope areas. In Jiangjia Gullies, the peak frequency of infrasounds is about 6 Hz when debris flow discharges are less than 500 m3/s. While the peak frequency decreases with the increasing discharge of debris flows. The stony debris flows occur in Houyenshan with the peak frequencies between 5-15 Hz during the surges. Non-stationary acoustic signals of the debris flows are analyzed by adopting the HHT approach.
infrasound monitoring system debris flow acoustic characteristics field studies
H.T. Chou Y.L. Cheung S.C. Zhang
Department of Civil Engineering, National Central University, Chung-Li, Chinese Taipei Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Res
国际会议
成都
英文
571-580
2007-05-17（万方平台首次上网日期，不代表论文的发表时间）