Comparison of Bi-Directional Sound Propagation in a Current Rip Region between Tsugaru Warm Eddy and Oyashio Cold Water Mass

TSURUGAYA Yoshiaki, GOTOH Shinpei, MIZUTANI Koichi, KIKUCHI Toshiaki

doi:10.3135/jmasj.43.53

Bibliographic Information

Other Title

津軽暖水渦と親潮冷水塊の境界の領域における双方向音響伝搬の比較
ツガルダンスイウズトオヤシオヒヤミズカイノキョウカイノリョウイキニオケルソウホウコウオンキョウデンパンノヒカク

Search this article

Abstract

<p>East of the Sanriku coast, there are three water masses, namely Tsugaru Warm current (TuWE), Kurisio extension, and Oyashio cold current (OyCWM). A current rip is generated in the region by which the warm water mass and the cold water mass are bounded. Sound propagation is influenced by the current rip region. In this study, bi-directional propagation along 41°N off the Sanriku coast is investigated. As a result, when the receiver was at a shallow depth with the sound source approaching from OyCWM to TuWE, the transmission loss (TL) is large until it approached the receiver near the shallow source. The combination of a shallow source and a deep receiver has a similar result. When the receiver comes close to the source, the TL decreases greatly because of the correspondence between the receiver position and the position of the bottom reflection. When the receiver is approached to the sound source in OyCWM from TuWE, the TL decreases as the receiver depth increases. Because the sound channel (SC) propagation predominates in OyCWM, the receiver depth can reduce the TL near the SC axis.</p>

Journal

The Journal of the Marine Acoustics Society of Japan

The Journal of the Marine Acoustics Society of Japan 43 (2), 53-70, 2016

The Marine Acoustics Society of Japan

Keywords

Details 詳細情報について

Export