Accession Number:

ADA571437

Title:

Estimation of Ocean and Seabed Parameters and Processes Using Low Frequency Acoustic Signals

Descriptive Note:

Corporate Author:

RHODE ISLAND UNIV NARRAGANSETT DEPT OF OCEAN ENGINEERING

Personal Author(s):

Report Date:

2011-09-01

Pagination or Media Count:

10.0

Abstract:

The long term goals of our research are to 1. Understand, model and exploit the acoustic propagation physics in shallow water in the presence of ocean fronts and internal waves. This goal conforms to the major theme of the Shallow Water 06 experiment i.e. 3-D acoustic effects. The effects of oceanographic variability such as frontal meander, and internal solitary waves on 3-D acoustic reflection and refraction will be investigated. 2. Improve inversion schemes for the estimation of sediment geoacoustic properties using low frequency broadband acoustic signals. The existing inversion method has been shown to successfully map compressional wave speed. The new work will focus on understanding the frequency and depth dependence of compressional wave attenuation and develop new inversion schemes for shear wave properties. We hypothesize that water-borne acoustic arrival properties such as their Airy Phase are sensitive to sediment shear properties. We hope to validate this hypothesis over the next period of investigation.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Geology, Geochemistry and Mineralogy
  • Acoustics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE