Accession Number:

ADA183047

Title:

Frequency Spectra of Acoustic Fluctuations Caused by Oceanic Internal Waves and Other Finestructure,

Descriptive Note:

Corporate Author:

LA JOLLA INST CA CENTER FOR THE STUDY OF NONLINEAR DYNAMICS

Personal Author(s):

• Flatte, Stanley M.
• Leung, R.
• Lee, S. Y.

Report Date:

1980-12-01

Pagination or Media Count:

7.0

Abstract:

The frequency spectrum of log-amplitude fluctuations is substantially modified flattened by a previously neglected effect the vertical advection of short internal waves by the more energetic internal waves with large vertical wavelength. The log-amplitude spectrum is sensitive to this vertical advection and to curvature of the equilibrium sound ray, whereas the phase spectrum is not. Noninternal wave frozen finestructure contributes to the log-amplitude frequency spectrum through vertical advection, but not to the phase spectrum. The Cobb Seamount experiment is treated as an example, the spectrum of the modified theory agrees well observations except at high frequency near the buoyancy frequency. Reprints

Descriptors:

• *INTERNAL WAVES
• *OCEAN WAVES
• *SEAMOUNTS
• ACOUSTIC SIGNALS
• ADVECTION
• BUOYANCY
• ENERGETIC PROPERTIES
• EQUILIBRIUM(GENERAL)
• FREQUENCY
• HIGH FREQUENCY
• PHASE
• REPRINTS
• SOUND
• SPECTRA
• VARIATIONS
• VERTICAL ORIENTATION

Subject Categories:

• Physical and Dynamic Oceanography
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE