Publication Date:
2022-05-26
Description:
Underwater Acoustic Measurements (UAM) 4th International Conference and Exhibition on "Underwater Acoustic Measurements: Technologies & Results." 20-24 June 2011, Kos, Greece
Description:
Propagation of sound through shallow-water internal waves of various types
is discussed. The anisotropy of the waves imparts an anisotropy to their effects on sound.
The internal waves are of two types: Long-wavelength internal tides and short-wavelength
high-frequency waves. On the continental shelf both types of waves tend to move
shoreward from deep water (i.e. have anisotropic motion and anisotropic correlation
scales). The internal tides are less predictable than the surface tides that generate them.
The short-wavelength nonlinear internal waves are also somewhat unpredictable, and
also have anisotropic correlation scales, having crests of tens of kilometres in length but
wavelengths of order 300 to 1000 m. Coupled-mode propagation dominates across-shelf
sound propagation, which in the direction of short internal wave correlation scale.
Refracted-mode propagation dominates along-shelf propagation. Data from two sea
exercises illustrate the character of the waves and their effects on sound.
Description:
Funding for this work is from the
Office of Naval Research, Ocean Acoustics Program.
Keywords:
Internal waves
;
Nonlinear internal waves
;
Internal tides
;
Coherence
;
Shallow-water acoustics
Repository Name:
Woods Hole Open Access Server
Type:
Working Paper
Format:
application/pdf
