Accession Number:

ADA151168

Title:

Sound Propagation through Directional Internal Wave Fields.

Descriptive Note:

Research rept. 1 Jun 82-1 Jun 83,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

• Neubert,J. A.

Report Date:

1984-11-01

Pagination or Media Count:

25.0

Abstract:

Acoustic propagation can be used to discern directional internal waves in ambient ocean internal wave fields. The Rytov method gives the mean square sound-level fluctuations and the mean square phase fluctuations as a function for the fluctuating component of the refractive index. These relations are valid throughout the unsaturated regime of sound fluctuations. The propagating vertical displacement of the directional internal wave field is formed, and from its correlation lengths the necessary correlation lengths the necessary correlation function can be obtained. Thence, for the directional internal wave field are found. Next and for expected horizontally isotropic ambient internal wave field are determined by manipulation of the Garrett and Munk spectrum. This technique can be applied to the detection of a directional internal wave in a background field of horizontally isotropic ambient internal waves as shown in the example. Keywords include underwater acoustics, Acoustic propagation, Rytov method.

Descriptors:

• *SOUND TRANSMISSION
• *INTERNAL WAVES
• OCEAN WAVES
• REFRACTIVE INDEX
• CORRELATION TECHNIQUES
• UNDERWATER ACOUSTICS
• DIRECTIONAL

Subject Categories:

• Physical and Dynamic Oceanography
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE