Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Underwater Acoustic Environment and Low Frequency Acoustic Transmission in the Sub-Polar Front Region of the East Sea

동해 아극전선 해역의 수중음향환경 및 저주파 음파전달 양상

  • Published : 2009.08.05
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Abstract

To investigate low frequency acoustic transmissions in the Sub-Polar Front(SPF) of the East Sea, numerical experiments are conducted with Range dependent Acoustic Model(RAM) using Circulation Research of the East Asian Marginal Seas(CREAMS) data and Autonomous Profiling Explorer(APEX)) data. Significant seasonal variations of sea water properties are existed across the Sub-Polar Front(SPF) region from the north and the south. The model results show that Transmission Loss(TL) decrease(about 20dB) with ideal front in the warm region whereas TL increase(about 25dB) with ideal front in the cold region. Regardless of season(both in summer and winter), when the sound source is located in the cold region of the SPF, the model results show weak TL, compared to the case of the source in the warm region(Maximum difference of TL reaches 28dB). This difference between the cases when the source is located in the cold region and the warm region, is accounted for from the different vertical profiles of sound speed in both regions.

Keywords

References

  1. An, H. S., Shim, K. S. and Shin, H. R, On the Warm Eddies in the Southwestern Part of the East Sea(the Japan Sea), J. Oceanol. Soc. Korea, 29(2), 152-163, 1994
  2. Park, K. A., Chung J. Y. and Kim, K., Sea Surface Temperature Fronts in the East(Japan) Sea and Temperal Variations, Geophys. Res. Lett., 31, L07304, 2004 https://doi.org/10.1029/2004GL019424
  3. Park, K. A., D. S. Ullman, K. Kim, J. Y. Chung, and K. R. Kim, Spatial and Temporal Variability of Satellite-Observed Subpolar Front in the East/Japan Sea. Geophys. Res. Lett., 32, L05610, doi : 10.1029/2004GL022197, 2007
  4. 송영일, '수중음향의 이해와 해양 및 음향 환경', 해군사관학교 교재, 2002
  5. 박경주, ‘동해 연안한류수역의 시공간적인 변화와 탐지거리에 관한 연구’, 군사과학대학원 석사학위 논문, 1998.
  6. 양승주, '남해 동부해역에서의 연안 수온전선과 저질특성에 따른 탐지거리 예측', 군사과학대학원 석사학위 논문, 2001
  7. 임세한, 윤재열, 김윤배, 남성현, '동해 북부해역의 수중음파전달 양상', 군사과학기술학회지, Vol. 10, No. 4, pp. 52-61, 2007
  8. Collins, M. D., 'A Split-Step Pade Solution for Parabolic Equation Method', J. Acoust. Soc. Am., 93 : 1736-742, 1993 https://doi.org/10.1121/1.406739
  9. Urick, R. J., Principle of Underwater Sound, McGraw-hill Book Company, New York 3rd ed., pp. 147-197, 1983