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Open AccessArticle

Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands

1
Department of Urban Environment & Disaster Management, Graduate School of Disaster Prevention, Kangwon National University, 346 Joongang-ro, Samcheok-si Gangwon-do 25913, Korea
2
Creation and Development, 346 Joongang-ro, Samcheok-si Gangwon-do 25913, Korea
*
Author to whom correspondence should be addressed.
Water 2020, 12(7), 1875; https://doi.org/10.3390/w12071875
Received: 24 March 2020 / Revised: 29 June 2020 / Accepted: 29 June 2020 / Published: 30 June 2020
Bed-load discharge of a river can be monitored by indirectly measuring the acoustic pulses generated when the bed load collides with a steel pipe installed on the riverbed (i.e., pipe hydrophone measurement). However, existing methods used for filtering pulses from acoustic signals reflect a combination of bed-load collision frequency bands, thereby limiting characterization capabilities. This study proposes an improved filtering method that separates and efficiently examines frequency bands that are highly correlated with bed-load collision characteristics. Herein, an experimental hydraulic model and bed-load collision sound-measurement system were constructed, and bed-load collision experiments were repeatedly performed for collecting acoustic data using a pipe hydrophone. Fast Fourier Transform analysis was performed on data to select the specific frequency bands and pressures reflecting the bed-load particle size. Furthermore, a bandpass method to examine bed-load collision sounds is also presented herein. Results indicate that in comparison with existing filtering methods, the proposed bandpass method yields higher detection rates under bed-load conditions of low flow rate and small particle size, thereby demonstrating its enhanced effectiveness. View Full-Text
Keywords: bed load; pipe hydrophone; laboratory experiment; Fast Fourier Transform; pulse filtering bed load; pipe hydrophone; laboratory experiment; Fast Fourier Transform; pulse filtering
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Choi, J.-H.; Jun, K.-W.; Jang, C.-D. Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands. Water 2020, 12, 1875.

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