High Resolution Bottom Backscatter Measurements

This docucment contains the slide presentation entitled High Resolution Bottom Backscatter Measurements given at the 107th meeting of the Acoustical Society of America on 8 May 1984 in Norfolk, VA. Acoustic bottom backscattering measurements and the corresponding geoacoustic properties of the ocean...

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Bibliographic Details
Main Authors: Roderick, W I, Dullea, R K
Other Authors: NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT
Format: Text
Language:English
Published: 1984
Subjects:
Acoustic Detection and Detectors
Acoustics
*ACOUSTIC MEASUREMENT
*ACOUSTIC SCATTERING
*BACKSCATTERING
*BOTTOM BOUNCE
ACOUSTIC PROPERTIES
ACOUSTIC REFLECTION
ACOUSTIC REFRACTION
AZIMUTH
BOXES
CORES
DISPERSIONS
FREQUENCY
FUNCTIONS
GEOACOUSTICS
GRAZING
HIGH RESOLUTION
LENGTH
LOW ANGLES
NARROW BEAMS(RADIATION)
OCEAN BOTTOM
OCEAN BOTTOM SOILS
OCEAN BOTTOM TOPOGRAPHY
PARAMETRIC DEVICES
PULSE RATE
PULSES
REVERBERATION
ROUGHNESS
SAND
SEDIMENTS
SHALLOW WATER
SONAR
STEREOPHOTOGRAPHY
TIME
TWO DIMENSIONAL
WATER
LPN-NUSC-A67001
PE62769N
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/ADA163546
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA163546
Description
Summary:This docucment contains the slide presentation entitled High Resolution Bottom Backscatter Measurements given at the 107th meeting of the Acoustical Society of America on 8 May 1984 in Norfolk, VA. Acoustic bottom backscattering measurements and the corresponding geoacoustic properties of the ocean bottom are presented for an experiment conducted in the shallow water of the North Atlantic. The bottom scattering strength data, which were obtained with a high resolution (narrow beamwidth) parametric sonar, were measured as a function of frequency (5 to 20 kHz), grazing angle (4 deg to 11 deg), azimuthal angle (+ or -55 deg), and pulse length (0.4 to 10 ms). The supporting environmental measurements included box cores for determining the acoustic properties of the sediment and stereo photography for calculating the two- dimensional roughness spectrum of the sea floor. Analyses indicate that the measured reverberation was significantly influenced by the macrobenthos of the area. In particular, nonhomogeneous concentrations of highly reflective sand dollars resulted in bottom scattering strengths that exhibited both range and pulse width dependencies. No strong frequency or grazing angle dependence was observed. In addition, refractive conditions in the water column were found to markedly alter the time dispersive characteristics of bottom reverberation.

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