Accession Number:

ADA537349

Title:

Acoustics of Underwater Sediments

Descriptive Note:

Annual rept.

Corporate Author:

COASTAL SYSTEMS STATION PANAMA CITY FL

Personal Author(s):

Report Date:

1998-09-30

Pagination or Media Count:

6.0

Abstract:

The long-term goal of this research is to understand environmental effects on acoustic propagation to and scattering from a known object buried in the ocean bottom. Enhanced acoustic transmission into sandy ocean sediments has been observed when a sound field incident on the bottom impinges at grazing angles below critical but the mechanism for the enhancement is not clear. Of particular interest here is a mechanism suggested by researchers from the Applied Physics Laboratory at the University of Washington APLUW, who propose small-scale surface roughness can enhance acoustic penetration by diffracting energy down according to the spatial wavelengths exhibited by the roughness. The goal of this work is to isolate and quantify the role of ocean bottom roughness on the transmission process and understand its implications to modifying the acoustic response of an object buried at extended ranges from an acoustic source.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Hydrology, Limnology and Potamology
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE