Accession Number:

ADA237167

Title:

Relating Ocean Acoustic Ambient to Ocean Surface Dynamics

Descriptive Note:

Technical document,

Corporate Author:

NAVAL UNDERWATER SYSTEMS CENTER NEWPORTRI

Personal Author(s):

Report Date:

1991-05-29

Pagination or Media Count:

25.0

Abstract:

The acoustical significance of ocean surface dynamics is well known. Motivation for establishing the casual relations between these two physical processes has both underwater acoustic system noise reduction and oceanographic remote sensing objectives. The goal has eluded investigators because of the complexity of both the acoustic and oceanographic mechanisms involved. The work discussed here continues progression in spatial scales by utilizing a relatively deep water basin The Tongue of the Ocean, the Bahamas in a quasi-controlled environment which made a broadband measurement 40 to 4000 Hz of the vertical directional spectrum are dominated by local fetch limited water surface conditions over a wide range of environmental conditions. While the exploratory nature of the experiment limited the amount of supporting meteorological and oceanographic measurements made, the results give additional credence to the role of entrapped air bubbles and bubble clouds in the generation of acoustic ambient. Sea surface-generated acoustics is shown to be dependent on a fundamental nondimensional variable describing the air-sea boundary process and the rate of energy dissipation caused by wave-breaking in the gravity wave equilibrium range.

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE