ON THE THEORY OF ACOUSTIC WAVE SCATTERING AND REFRACTION BY INTERNAL WAVES.
NAVY UNDERWATER SOUND LAB NEW LONDON CONN
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A theoretical treatment of the interaction between an acoustic plane wave and a stationary internal wave of a two-layer fluid is presented. The acoustic plane wave is incident from below upon a sinusoidal boundary separating two liquidhalf-spaces. The incident radiation undergoes reflection, scattering, and refraction at the interface. An integral method is employed to obtain two, exact, simultaneous infinite sets of equations relating the complex boundary amplitude coefficients. Exact expressions for the acoustic velocity potentials for the scattered and transmitted fields have also been found. From the general relations approximate equations have been developed for nine special cases. Two of these cases, important in underwater acoustics, are for small and large values of the product of the acoustic wavenumber and the internal wave amplitude. Author