Accession Number : ADA322491

Title :   Environmental Ocean-Bottom Backscattering Strength Based on the Mourad-Jackson Model.

Descriptive Note : Final rept. 1993-1996,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC ACOUSTICS SYSTEMS BRANCH

Personal Author(s) : Baer, Ralph N. ; Fromm, David M.

PDF Url : ADA322491

Report Date : 15 FEB 1997

Pagination or Media Count : 18

Abstract : Current formulations used by the Navy to model reverberation in active-acoustic-system performance scenarios are heuristic in that they do not include physical descriptors of the environment. Here we investigate a model developed originally by Pierre Mourad and Darrell Jackson of APL/UW for the backscatter component of reverberation that includes environmental descriptors in the form of eight environmental parameters, most of which can be experimentally determined in a given scenario. This model is being considered as a candidate for future incorporation into NRL's active acoustic systems performance models such as RASP, BiRASP, and BiKR. Special consideration is given to littoral (near-coastal) scenarios. The water-sediment interface contribution to backscatter is, in general, benign. Although there can be more structure in the sediment volume contribution to backscatter, it is usually benign, except for when extreme values of some parameters are used. Thus, the Mourad-Jackson model can probably be incorporated into active-acoustic-system performance prediction models by fitting the parameter space and using table look-ups.

Descriptors :   *ACOUSTIC SCATTERING, *REVERBERATION, *SEDIMENTS, MATHEMATICAL MODELS, SCENARIOS, BACKSCATTERING, HEURISTIC METHODS, UNDERWATER ACOUSTICS, ACOUSTIC VELOCITY, LITTORAL ZONES, OCEAN MODELS, OCEAN ENVIRONMENTS, OCEAN BOTTOM SOILS.

Subject Categories : Acoustics
      Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE