Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands
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 combina...
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doaj-fcfab0bd07d24dfd8e12ba45a33272352020-11-25T03:18:21ZengMDPI AGWater2073-44412020-06-01121875187510.3390/w12071875Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency BandsJong-Ho Choi0Kye-Won Jun1Chang-Deok Jang2Department of Urban Environment & Disaster Management, Graduate School of Disaster Prevention, Kangwon National University, 346 Joongang-ro, Samcheok-si Gangwon-do 25913, KoreaDepartment of Urban Environment & Disaster Management, Graduate School of Disaster Prevention, Kangwon National University, 346 Joongang-ro, Samcheok-si Gangwon-do 25913, KoreaCreation and Development, 346 Joongang-ro, Samcheok-si Gangwon-do 25913, KoreaBed-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.https://www.mdpi.com/2073-4441/12/7/1875bed loadpipe hydrophonelaboratory experimentFast Fourier Transformpulse filtering |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jong-Ho Choi Kye-Won Jun Chang-Deok Jang |
spellingShingle |
Jong-Ho Choi Kye-Won Jun Chang-Deok Jang Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands Water bed load pipe hydrophone laboratory experiment Fast Fourier Transform pulse filtering |
author_facet |
Jong-Ho Choi Kye-Won Jun Chang-Deok Jang |
author_sort |
Jong-Ho Choi |
title |
Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands |
title_short |
Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands |
title_full |
Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands |
title_fullStr |
Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands |
title_full_unstemmed |
Bed-Load Collision Sound Filtering through Separation of Pipe Hydrophone Frequency Bands |
title_sort |
bed-load collision sound filtering through separation of pipe hydrophone frequency bands |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2020-06-01 |
description |
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. |
topic |
bed load pipe hydrophone laboratory experiment Fast Fourier Transform pulse filtering |
url |
https://www.mdpi.com/2073-4441/12/7/1875 |
work_keys_str_mv |
AT jonghochoi bedloadcollisionsoundfilteringthroughseparationofpipehydrophonefrequencybands AT kyewonjun bedloadcollisionsoundfilteringthroughseparationofpipehydrophonefrequencybands AT changdeokjang bedloadcollisionsoundfilteringthroughseparationofpipehydrophonefrequencybands |
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