Accession Number : AD0721679

Title :   Acoustical Investigation of the Deep Scattering Layers at the Bermuda Ocean Acre Site in April and November 1969.

Descriptive Note : Research rept.,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB

Personal Author(s) : Dullea,Robert K.

Report Date : 10 DEC 1970

Pagination or Media Count : 17

Abstract : As a part of the Ocean Acre Program, experimental studies of volume reverberation were conducted near Bermuda during April and November of 1969. Downward looking transducers with CW pulse transmissions were used. The spring measurements were made at frequencies of 3.5, 13.5, and 15.5 kHz. The fall measurements were made at 12.0 kHz. The resultant data include frequency comparisons of peak scattering strength versus depth, as well as daily and seasonal comparisons of scattering strength. During the spring studies, daytime scattering at the upper frequencies was greater than that at 3.5 kHz. At nighttime, the reverberation at 3.5 kHz increased to a level comparable with that of the upper frequencies. Daily comparisons of the scattering strength profiles exhibited excellent structural repeatability. The fall reverberation measurements yielded generally greater peak scattering strengths when compared with the spring measurements. (Author)

Descriptors :   (*UNDERWATER SOUND, SCATTERING), ECHO RANGING, REVERBERATION, UNDERWATER SOUND EQUIPMENT, VERY LOW FREQUENCY, BERMUDA, ATLANTIC OCEAN

Subject Categories : Physical and Dynamic Oceanography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE