Accession Number:

ADA571590

Title:

Experimentally-Based Ocean Acoustic Propagation and Coherence Studies

Descriptive Note:

Corporate Author:

WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEEP SUBMERGENCE LAB

Personal Author(s):

Report Date:

2011-09-01

Pagination or Media Count:

11.0

Abstract:

LONG TERM GOALS The long term goal is to better understand fluctuating sound propagation conditions in two distinct ocean acoustic environment types. The first type is stratified shallow water where sound is highly bottom interacting. The second type is the mostly non bottom-interacting temperate deep-ocean sound channel. Reliable predictions of temporal and spatial variability of received underwater sound can improve processing and handling of signals of interest, including remediation of signal degradation and exploitation of available sonic information. Acoustic field fluctuations have time scales from less than a minute to hours, and horizontal spatial scales from tens of meters as short as a few wavelengths at our lowest frequencies to kilometers, and thus impact exploitation of underwater sound. OBJECTIVES An overarching objective is to explain observed sound fluctuation behavior in environments with three-dimensional structure at all significant scales. For the shallow-water ocean environment, the objective is to develop knowledge of factors controlling acoustic field mean and variability both transmission loss and phase at frequencies from 50 to 3000 Hz. For the deep-ocean sound channel, the objective is to better characterize coupled-mode propagation at 50 to 100 Hz, which may have some behavior in common with shallow-water coupled-mode propagation.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE