Accession Number : ADA324434

Title :   Bottom Backscattering Measured Off the South Carolina Coast During Littoral Warfare Advanced Development Focused Technology Experiment 96-2.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC ACOUSTICS SYSTEMS BRANCH

Personal Author(s) : Soukup, Raymond J. ; Ogden, Peter M.

PDF Url : ADA324434

Report Date : 28 APR 1997

Pagination or Media Count : 17

Abstract : Measurements of ocean bottom backscattering were performed in a shallow water environment off the coast of South Carolina as pan of the Littoral Warfare Advanced Development (LWAD) Focused Technology Experiment 96-2 (FTE 96-2). Scattering strengths were obtained at 2, 2.5, 3 and 3.5 kHz as a function of grazing angle. The site dependence arising from the presence or absence of a sandy sediment layer was investigated; the results were consistent with observations of sediment thickness on a seismic track. Scattering strengths in the absence of sediment were on the order of -13 dB and relatively frequency independent, while scattering strengths in the presence of the sediment layer were 15-20 dB lower and showed some frequency dependence, suggesting the influence of attenuation effects within the sediment. The grazing angle dependence could be fit adequately by assuming a dependence of scattering strength on the sine of the grazing angle.

Descriptors :   *BACKSCATTERING, *UNDERWATER ACOUSTICS, *GRAZING ANGLES, COASTAL REGIONS, LAYERS, SHALLOW WATER, GEOACOUSTICS, ACOUSTIC ATTENUATION, REVERBERATION, SEDIMENTS, OCEAN BOTTOM.

Subject Categories : Acoustics
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE