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Ocean ambient noise in shallow water is more complicated than that in deep sea. The snapping shrimp produces broadband impulsive-shape noise, which is one of significant component of ambient noise in shallow water. Snapping shrimp noise brings the degradation of signal-to-noise (SNR) ratio of sonar systems and underwater communication performance, compared to other biological sources. The Shallow-water Acoustic Variability Experiment (SAVEX 15) was performed in May 2015 at a shallow water off the southwest of Jeju Island, Korea in water 100 m deep. During SAVEX 15, the high-frequency (> 3 kHz) soundscape was significantly dominated by the snapping shrimp noise. In this study, envelope correlation method combined with the threshold detection based on kurtosis was used to extract the snapping events from the data. Although many previous researches have reported the diurnal variation of snapping shrimp noise, the tendency of the diurnal variation was not seen in our data. The possible reasons will be discussed in this talk.
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