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):

Report Date:

1997-04-28

Pagination or Media Count:

17.0

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.

Subject Categories:

  • Acoustics
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE