• Title/Summary/Keyword: 풍성기포

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Effects of Wind-Generated Bubbles on Sound Propagation (음파전달에 미치는 풍성기포의 영향)

  • Lee, Won-Byoung;Kim, Young-Shin;Joo, Jong-Min;Lee, Chang-Won;Na, Jung-Yul
    • The Journal of the Acoustical Society of Korea
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    • v.25 no.8
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    • pp.395-402
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    • 2006
  • When an active SONAR works in the subsurface. its detection Performance is limited by the reverberation. The winds Play a primary role in the Production of bubbles in the ocean. And the bubbles as efficient scatters contribute to the reverberant field. In this Paper the effects of wind-generated bubbles on sound propagation in the subsurface are investigated as a mid-frequency Hull-mounted SONAR works. The active signal excess is calculated at source depths 3. 5. and 10m considering bubble layer for frequencies 5. 7.5, and 10kHz. The change of the near-surface sound speed tend to increase surface reverberation levels and change the active signal excess. In the 10m/s winds. the maximum detection range reduces over 3km through the near-surface . The reason is the upper refraction due to the wind-generated bubbles.