The theoretical study of acoustic field in shallow water excited by an aero source

The underwater acoustic field excited by an aero-source is studied when the air sound velocity is assumed as Epstein distribution, and the shallow water and the seabed are assumed as iso-speed layers (Epstein model). Acoustic pressure solution is obtained. The numerical analysis results indicate that normal modes with true eigenvalues exist when the shallow water column is excited by an aero-source and they can propagate over long distance. The normal mode is named "water wave" in this paper. The normal modes existing in the aero Epstein waveguide are lateral waves while traveling in the water layer with the sound speed of the air. And the lateral wave is named as "surface water wave", on which the Doppler shift caused by the aero moving source is greater than that on the "water wave".