Effects of water temperature inversion layer on underwater sound propagation in the East China Sea

Abstract

In this study, we investigated the effect of a water temperature inversion layer on the propagation of acoustic waves in the western coastal sea of Jeju Island in April 2015. When the acoustic source and receiver are simultaneously located within the water temperature inversion layer depth, the long-range propagation of acoustic waves is confirmed by numerical modeling. This is caused by the duct effect due to the water temperature inversion phenomenon. For the experimental area without the water temperature inversion layer, when the acoustic source and receiver are simultaneously located below thermocline depth, the long-range propagation of acoustic waves is also confirmed. This is generally caused by the seasonal water temperature profile.

A Study of Performance Characteristics for Active Sonar in Korean Shallow Seawater Temperature Structures

“…Kim et al (2016)은 황해와 남해에서의 수중통신과 관련한 해상실험과 반송주파수에 따른 상 관대역폭 분석을 수행하였다 [11] . 능동소나 탐지성능과 롼련된 연구로는 Kim et al (2015)의 음원 심도에 따 른 수온역전층의 영향을 관측 자료를 이용한 연구가 있으며 [12] , Oh et al (2019)은 수온역전층이 선저부착 형 능동소나의 탐지성능에 미치는 영향을 분석한 연 구가 있다 [13] .…”

Spatial mapping of underwater noise radiated from passing vessels using automatic identification system data

“…The TL for all horizontal azimuth angles was calculated at 10°intervals at each receiver point. The TL was calculated using BELLHOP, [25][26][27][28][29] a ray-based acoustic model that can consider a range-dependent environment. Ships are a very complex source of noise that have horizontal noise directionality radiated from the hull and cavitations at the propeller.…”