A parabolic equation solution for advected acousto-gravity waves

It is relatively difficult to account for advection in parabolic equation solutions. An effective solution was recently derived for the acoustic case [J. Acoust. Soc. Am. 111, 729–734 (2002)]. This work is currently being extended to include buoyancy effects. In the initial study, emphasis is placed on wave numbers near the Lamb wave, where buoyancy and compressibility both have a significant effect. An approximate parabolic solution is derived and tested for range-indendent cases using a spectral solution. The limiting cases of small ambient flow and/or no gravity are compared to the extended result for consistency. [Work sponsored by the ONR.]