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Measurement of low-frequency underwater noise by a self-recording hydrophone

Measurement of low-frequency underwater noise by a self-recording hydrophone. Bong-Chae Kim, Hongsang Cho, Byoung-Nam Kim, Chang-Woong Shin, Donggoog Kim, and Bok Kyung Choi Marine Environment Research Department Korea Ocean Research & Development Institute. Objectives of this study.

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Measurement of low-frequency underwater noise by a self-recording hydrophone

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  1. Measurement of low-frequency underwater noise by a self-recording hydrophone Bong-Chae Kim, Hongsang Cho, Byoung-Nam Kim, Chang-Woong Shin, Donggoog Kim, and Bok Kyung Choi Marine Environment Research Department Korea Ocean Research & Development Institute

  2. Objectives of this study To test a newly developed self-recording hydrophone to measure low-frequency underwater noise in the sea To acquire low-frequency ocean noise data at a site in the South Sea of Korea To investigate correlation between noise levels and environment variables

  3. Block diagram and specifications ofself-recording hydrophone

  4. Receiving frequency characteristics ofself-recording hydrophone

  5. Self-recording hydrophone B&K 8103 hydrophone SD memory Battery

  6. Measurement site East Sea KOREA Yellow Sea Korea Strait ● site South Sea JAPAN CHINA

  7. Instruments installation for noise measurement Anemometer Radar R/V Eardo 10 m 10 m 10 m Sea surface 5 m ADCP CTD Hydrophone (20 m) 52 m Hydrophone (40 m) Self-recording hydrophone Sea bed

  8. Recording Spectrum analysis Instrumentation cassette recorder (Sony PC208Ax) Spectrum analysis (DADiSP 2002) Oscilloscope (LeCroy LT264M) Personal computer A/D converter (NI PCI-6034E, 16bit) Measuring amplifier (B&K 2636) Hydrophone (B& K 8106) Instrumentation cassette recorder (Sony PC208Ax) Recording and spectrum analysis systemby conventional cabled hydrophone

  9. Environment variables

  10. Averaged noise spectrum level

  11. Mean and standard deviation ofnoise spectrum level

  12. Correlation between wind speed and noise level (20 m depth) Correlation coefficient = 0.0323 Correlation coefficient = -0.1266

  13. Correlation between wind speed and noise level (40 m depth) Correlation coefficient = 0.0286 Correlation coefficient = -0.2638

  14. Correlation between wind speed and noise level (52 m depth) Correlation coefficient = 0.1435 Correlation coefficient = 0.0037

  15. Correlation between current velocity and noise level (20 m depth) Correlation coefficient = 0.6555 Correlation coefficient = -0.1668

  16. Correlation between current velocity and noise level (40 m depth) Correlation coefficient = 0.6303 Correlation coefficient = -0.4576

  17. Correlation between current velocity and noise level (52 m depth) Correlation coefficient = -0.3027 Correlation coefficient = -0.0248

  18. Summary A self-recording hydrophone was newly developed to use for measurement of low-frequency ocean noise.Low-frequency noise at a site of the South Sea of Korea was measured by using the self-recording hydrophone and conventional cabled hydrophones.The self-recording hydrophone is superior to the conventional cabled hydrophone to measure low-frequency underwater noise when in particular water flow is strong.

  19. Thank you!

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