Acoustic Volume Scattering: Its Dependence on Frequency and Biological Scatterers.
Research and development rept. Aug 73-Jul 74,
NAVAL UNDERSEA CENTER SAN DIEGO CALIF
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The report discusses the dependence of acoustic valume scattering on frequency and biological scatterers in the Westfall Seamount Area, 200 miles off the coast of San Diego, California. Theoretical calculations and experimental data both showed a correlation between the frequency dependence of scattering from 1 to 20 kilohertz and midwater gas-bladder fishes. It is the hypothesis of the report that the size limitation of the swimbladders 0.5 to 5.0 millimeters of these dominant scatters determines the frequency pattern a sharp increase in scattering from 1 to 5 to 6 kilohertz followed by a relatively constant value to 20 kilohertz which is observed off San Diego and many other deep ocean areas.