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Analysis of acoustic features of pebble collision

XUE Feilong;SONG Dandan;DU Sicai;School of River & Ocean Engineering,Chongqing Jiaotong University;  
Study on the movement mechanism of pebble bedload is significant to riverbed evolution forecast,reservoir sedimentation research and waterway regulation engineering. However,there are many limitations in the existing pebble movement observation technology. Due to the unique advantages of sound wave propagation in water,the audio analysis was used to study the effects of particle size and collision velocity on acoustic features of pebble. Besides,the time domain and frequency domain parameters of the audio signal are analyzed. Furthermore,the relationship between the acoustic features of pebbles and its own physical characteristics was investigated,and the key acoustic parameters were extracted. The research results showed that the waveform parameters,peak factor,peak of power spectral density and frequency energy ratio were positively correlated with the pebble size. Moreover,the collision speed has exerted a relatively large influence on the waveform index and peak power spectral density.
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