Estimates of Bottom Loss Upgrade Geoacoustic Parameters at Three Locations in the South Atlantic.

摘要

The objective of the Bottom Loss Upgrade Program (BLUG), cosponsored by the NORDA SEAS and TAEAS programs, is to increase the accuracy of low frequency acoustic predictions made by Fleet Numerical Oceanographic Center (FNOC) through an improved treatment of the acoustic interaction with the ocean floor. This objective is being achieved by replacing the limited set of bottom loss classes by a database containing a simplified set of geoacoustic parameters describing the ocean floor. Use of the BLUG database by suitably modified FNOC software will allow more accurate modeling of the effect of the ocean floor on both the amplitude and phase of the acoustic signal as well as providing dependence on frequency, grazing angle, and location in greater detail than currently possible. It is expected that the initial BLUG parameter values will be changed as new acoustical and geological data becomes available for analysis. The number and kind of geoacoustic parameters used in the BLUG profile are also expected to change in response to new research results, which will allow more complex bottom structures and higher frequencies to be treated accurately.