Coherence of Sound using Navy Sonars: Deep Water Acoustics
Abstract
The long term goals are 1) to determine when methods can be used to reliably and accurately predict the temporal and spatial coherence of sound at low frequencies in the sea, 2) to develop reliable and accurate methods to make such predictions and, 3) to determine the physical mechanisms affecting coherence. The first two goals are to be achieved without tuning with data in any way whatsoever. The primary objective is to determine when the temporal and spatial scales of temporal and spatial coherence are accurately predicted by solving an approximation of the acoustic wave equation for climatological conditions in the ocean perturbed by a time-evolving field of internal gravity waves following a standard spectrum. These waves have long been thought responsible for coherence in the deep ocean at low frequencies. However despite decades of theoretical work to predict coherence, theoretical models to date are highly unreliable, often been inaccurate by several orders of magnitude. We are comparing numerical predictions for coherence with data collected with Navy sonars.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2010
- Accession Number
- ADA542058
Entities
People
- John L. Spiesberger