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Effect of Internal Solitary Waves on Underwater Acoustic Propagation

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Abstract:

Abstract

Internal solitary waves (ISWs) were observed on 07:52‐09:36 GMT July 30, 2005, in the Philippine Sea near Taiwan from high-resolution temperature sampling. The effect of ISWs on acoustic propagation was identified using the Navy’s Comprehensive Acoustic Simulation System through comparison between range-independent and range-dependent sound speed profiles. The ISWs enhance the sound propagation slightly (0‐3 dB) in near-range, weaken or enhance the sound propagation (−20 to 20 dB) evidently in midrange, and always weaken the sound propagation (up to −20 dB) in far range. The ISW’s effect on the acoustic propagation varies with sound frequency and sound source depth. This work provides a methodology to anticipate possible errors in transmission loss estimation in an operational framework, if no further additional data are available.

Keywords: Acoustic detection; CASS/GRAB; Coastal monitoring buoy; Internal solitary wave; Ray path

Document Type: Research Article

DOI: https://doi.org/10.4031/MTSJ.44.5.2

Publication date: 2010-09-01

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  • The Marine Technology Society Journal is the flagship publication of the Marine Technology Society. It publishes the highest caliber, peer-reviewed papers on subjects of interest to the society: marine technology, ocean science, marine policy and education. The Journal is dedicated to publishing timely special issues on emerging ocean community concerns while also showcasing general interest and student-authored works.
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