Ocean Dynamics and Acoustic Variability in the East China Sea
Abstract
The East China Sea (ECS) and surrounding area is a complex region from the perspective ofoceanography, hydrography, and bathymetry. In turn, the internal wave activity within thisregion also is extremely complex. The variability in the sound speed field due to internal waveperturbations along with strong current in the ECS impacts significantly the variability of theacoustic field over various time scales. In collaboration with Korean and US scientists, ashallow-water acoustic variability experiment (SAVEX15) was conducted in the NortheasternECS in May 2015 using the R/V Onnuri. The objective of the SAVEX15 was to obtain acousticand environmental data appropriate for studying the coupling of physical oceanography, oceanacoustics, signal processing, and underwater communications. A surprising aspect of theoceanography was the revelation of an underwater sound channel (USC) persistent in the shallowwater waveguide (~100 m deep) with the channel axis at around 40 m. This work continues toanalyze the acoustic and environmental data from SAVEX15 to study: 1) the impact of an USCon acoustic propagation, 2) ambient noise characteristics in the ECS including snapping shrimp,3) acoustic communications in the presence of ubiquitous snapping shrimp sound, and 4) low frequencyacoustic propagation, reverberation, and localization.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2017
- Source ID
- N000141712101
Entities
People
- Hee Chung Song
Organizations
- Office of Naval Research
- United States Navy
- University of California, San Diego