Shelf Break Acoustics Environmental and Biological Variability and its Impact on Acoustic Propagation
Abstract
The work proposed here revolves around understanding the impact of extreme spatial and temporal environmental (physical and biologi"cal) variability on the scales of a few-hundred meters to 10 km on acoustic propagation relevant to Navy mid-frequency active sonar (MFAS) in the New England shelf break region. A coordinated shelf break acoustics experiment is proposed, involving high-resolution, synoptic measurements of fine-scale shelf break physicaland biophysical processes using a combination of shipboard broadband backscatter, CTD and ADCP measurements, fish trawls, AUV-based sonar and oceanographic measurements, a newlybuilt novel towed vehicle with broadband split-beam arrays spanning 1-450 kHz, as well as a ship-board high-resolution ocean forecast model. Deployment of the towed vehicle will allow target strength measurements of individual fish and/or aggregations at frequencies including the resonance and geometric scattering regimes. The ship-board forecast model will be used for realtime sampling adjustment and acoustic propagation and sensitivity analysis. The proposed measurements will be coordinated in space and time with the larger scale shelf-break physical oceanographic measurement being proposed by G. Gawarkiewicz (WHOI), the acoustic propagation measurements and sensitivity analysis concurrently proposed by Y-T Lin using the WHOI-Keck Real Time Acoustic Telescope, and the NOAA Northeast Fisheries Sciences Cente"r Bottom Trawl Surveys to obtain fish species composition, size, and abundance.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 26, 2019
- Source ID
- N000141912710
Entities
People
- Andone Lavery
Organizations
- Office of Naval Research
- United States Navy
- Woods Hole Oceanographic Institution