Accession Number:

ADA128514

Title:

Acoustic Ray Tracing and Three-Dimensional Propagation Loss Representation in the Gulf Stream Region.

Descriptive Note:

Technical note,

Corporate Author:

NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS

Personal Author(s):

Report Date:

1977-09-01

Pagination or Media Count:

26.0

Abstract:

Acoustic ray traces and intensities for fixed and variable receiver depths were calculated for three cross sections in the Gulf Stream region using AXBT temperature profiles and historical sound velocity data. Two sections were in the Sargasso Sea and one crossed the Gulf Stream. It is shown that for shallow source and receiver depths, a 4 dB difference in intensity is found in the Sargasso Sea due to sonic layer depth differences. When sound intensities across the Gulf Stream were compared to intensities for similar situation without a front, it was found that the Gulf Stream North Wall could either increase or decrease propagation loss depending on distance of the receiver from the front the maximum difference was 18 dB. The South Wall of the Stream had no significant effect on sound intensity. Three-dimensional propagation loss diagrams show that effects of the North Wall on propagation loss persist at all receiver depths from sea surface to 1000 meters. Author

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE