Temporal and Spatial Variability of Sound Propagation Characteristics in the Northern East China Sea

Park, Kyeongju; Chu, Peter Cheng

doi:2015.18.2.201

J. KIMS Technol > Volume 18(2); 2015 > Article

Journal of the Korea Institute of Military Science and Technology 2015;18(2):201-211.
DOI: https://doi.org/10.9766/KIMST.2015.18.2.201

Temporal and Spatial Variability of Sound Propagation Characteristics in the Northern East China Sea

Kyeongju Park, Peter Cheng Chu

¹Department of Oceanography, Korea Naval Academy
²Department of Oceanography, Naval Postgraduate School

동중국해 북부해역에서 음파전달 특성의 시공간적 변동성

박경주, 피터추

¹해군사관학교 해양학과
²미 해군대학원 해양학과

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.

Key Words: Shallow-water Acoustics, Sound Propagation, Transmission Loss, Variability, East China Sea