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

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Temporal and Spatial Variability of Sound Propagation Characteristics in the Northern East China Sea

동중국해 북부해역에서 음파전달 특성의 시공간적 변동성

  • 박경주 (해군사관학교 해양학과) ;
  • 피터추 (미 해군대학원 해양학과)
  • Received : 2014.09.19
  • Accepted : 2015.03.20
  • Published : 2015.04.05
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Abstract

Acoustic propagation in shallow water with changing environments is a major concern of navy. Temporal and spatial variability of acoustic propagation in the northern East China Sea (ECS) is studied, using the 11 years hydrographic data and the Bellhop acoustic model. Acoustic propagation in the northern ECS is highly variable due to extensive interaction of various ocean currents and boundaries. Seasonal variations of transmission loss (TL) with various source depths are highly affected by sharp gradient of sound speed and bottoms interaction. Especially, various bottom sediment types lead to severely degrading a waterborne propagation with bottom loss. In particular, the highly increased TL near the ocean front depends on the source position, and the direction of sound propagation.

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