Attenuation of Low-Frequency Sound in the Ocean: NUSC Research Program 1967-1972.

During the past five years, the Naval Underwater Systems Center has conducted a series of experiments to study the attenuation of low-frequency sound in sea water. The report reviews each of these investigations and the techniques employed and traces their respective contributions to the current und...

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Bibliographic Details
Main Authors: Browning,David G., Thorp,William H.
Other Authors: NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB
Format: Text
Language:English
Published: 1974
Subjects:
Physical and Dynamic Oceanography
Acoustic Detection and Detectors
Acoustics
*Underwater sound
*Sea water
Attenuation
Low frequency
Sound transmission
Red Sea
Indian Ocean
Hudson Bay
Lake Superior
Lake Tanganyika
Most Project-2
Bay Lake
Hudson
Indian
Online Access:http://www.dtic.mil/docs/citations/AD0774884
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0774884
Description
Summary:During the past five years, the Naval Underwater Systems Center has conducted a series of experiments to study the attenuation of low-frequency sound in sea water. The report reviews each of these investigations and the techniques employed and traces their respective contributions to the current understanding of sound attenuation in the ocean. Experimental evidence suggesting the probable existence in sea water of a relaxational process around one kHz is reinforced by recent laboratory measurements involving boron-borate reactions. Results of measurements in major ocean areas of the world show generally consistent values of low-frequency attenuation, thereby permitting use of simple empirical formulas for adequate prediction at frequencies above 100 Hz. At longer wavelengths, the exact behavior of the coefficients remain poorly defined. (Author)

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