Bottom Reverberation Measurements in the Norwegian Sea and North Atlantic Ocean.

Measurements of bottom reverberation were made at six locations in the Norwegian Sea and North Atlantic Ocean, and scattering strengths determined for grazing angles between 83 deg 30 min and 35 deg 30 min, and one-third octave frequencies from 2.5 to 12.5 kHz. In general, the data are consistent wi...

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Bibliographic Details
Main Author: Schmidt, Peter B.
Other Authors: NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS
Format: Text
Language:English
Published: 1969
Subjects:
Acoustics
(*UNDERWATER SOUND
NORWEGIAN SEA)
(*ECHO RANGING
ATLANTIC OCEAN)
REVERBERATION
SOUND TRANSMISSION
MEASUREMENT
SCATTERING
VERY LOW FREQUENCY
SITE SELECTION
OCEANOGRAPHIC DATA
UNDERWATER SOUND SIGNALS
OCEAN BOTTOM TOPOGRAPHY
GRAPHICS
NORTH ATLANTIC OCEAN
MOST PROJECT-2
Norwegian Sea
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/AD0852507
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0852507
Description
Summary:Measurements of bottom reverberation were made at six locations in the Norwegian Sea and North Atlantic Ocean, and scattering strengths determined for grazing angles between 83 deg 30 min and 35 deg 30 min, and one-third octave frequencies from 2.5 to 12.5 kHz. In general, the data are consistent with the concept of Volovova and Zhitovskiy (1965), in which the bottom is considered to be composed of roughness elements much greater and much smaller than the wavelengths of the incident sound, with each type of roughness producing characteristic effects in the reverberation. Among these effects, evident in the analyzed data, are a small dependence of scattering strength on frequency at high grazing angles, and a greater dependence at low grazing angles. Scattering strengths at the higher frequencies do not decrease as much with decreasing grazing angles as do those at the lower frequencies. Standard deviations of scattering strengths are greatest at high grazing angles and low frequencies. Contrary to the data presented by Randlett and Urick (1968), no clear relationships between bottom scattering strength and physiographic province are evident, but this is perhaps due to the small number of stations studied. (Author)

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