O CEAN A COUSTIC W AVEGUIDE R EMOTE S ENSING (OAWRS) Helen Dickson.

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Presentation transcript:

O CEAN A COUSTIC W AVEGUIDE R EMOTE S ENSING (OAWRS) Helen Dickson

R EVIEW : A CTIVE A COUSTIC S ENSING An acoustic signal is generated Sound waves travel through the water and scatter off objects Backscattered sound is recorded

R EVIEW : C ONVENTIONAL F ISH F INDING S ONAR (CFFS) Uses active acoustic sensing Sends sound waves straight down through the water column

P ROBLEMS OF C ONVENTIONAL F ISH F INDING S ONAR Attenuation Frequency Image size Sampling frequency

O CEAN A COUSTIC W AVEGUIDE R EMOTE S ENSING Method of active acoustic sensing Developed by MIT Sends sound waves horizontally through the water column

A COUSTIC W AVEGUIDES Physical structures for guiding waves Allow acoustic waves to travel long distances with little attenuation The continental shelf as a waveguide

O CEAN A COUSTIC W AVEGUIDE R EMOTE S ENSING Little attenuation Lower frequency Much larger image (1,000s of square km’s) Images created every minute (or less)

I MAGE GENERATED BY OAWRS

M OVIE GENERATED BY OAWRS

A PPLICATIONS Shoal Characteristics: Formation (critical density) Migration Leaders Monitor and conserve fish populations Identify fish species based on return signal

A PPLICATIONS Acoustic clutter Acoustic returns from objects in the water other than the intended target Is it a submarine or is it a school of fish? Important in Navy operations OAWRS allows more detailed information to be gathered

R EFERENCES Holden, Constance. Sound Sightings Science. 313(5788):777 Makris, Nicholas C., et al. Fish Population and Behavior Revealed by Instantaneous Continental Shelf-Scale Imaging Science. 311(5761): Makris, Nicholas C. et al. Critical Population Density Triggers Rapid Formation of Vast Oceanic Fish Shoals Science. 323(5922): Makris, Nicholas C. Acoustic Clutter and Ocean Acoustic Waveguide Remote Sensing (OAWRS) in Continental Shelf Environments. Makris, Nicholas C. Continuous Monitoring of Fish Population and Behavior by Instantaneous Continental-Shelf-Scale Imaging with Ocean Waveguide Acoustics. Ratilal, Purnima et al. Long range acoustic imaging of the continental shelf environment: The Acoustic Clutter Reconnaissance Experiment Journal of The Acoustic Society of America. 117(4): Woods Hole Oceanographic Institution