Acoustic-gravity waves in atmospheric and oceanic waveguides.
A theory of guided propagation of sound in layered, moving fluids is extended to include acoustic-gravity waves (AGWs) in waveguides with piecewise continuous parameters. The orthogonality of AGW normal modes is established in moving and motionless media. A perturbation theory is developed to quantify the relative significance of the gravity and fluid compressibility as well as sensitivity of the normal modes to variations in sound speed, flow velocity, and density profiles and in boundary conditions. Phase and group speeds of the normal modes are found to have certain universal properties which are valid for waveguides with arbitrary stratification. The Lamb wave is shown to be the only AGW normal mode that can propagate without dispersion in a layered medium.
CIRES, University of Colorado, and Physical Sciences Division, NOAA Earth System Research Laboratory, DSRC, Mail Code R/PSD99, 325 Broadway, Boulder, Colorado 80305-3328, USA. oleg.godin@noaa.gov
Oleg A
OA
Godin
D000162:Acoustics; D001272:Atmosphere; D006112:Gravitation; D016014:Linear Models; D009038:Motion; D009792:Oceans and Seas; D011312:Pressure; D013016:Sound; D013997:Time Factors; D014867:Water
D014867:Water