Analysis of the Influence of Long-Wavelength Surface Waves on the Formation of the Wind-Wave-Scattered Acoustic Field in Oceanic Waveguides

Abstract

The paper considers the interference structure during underwater pulsed sounding in the ocean associated with acoustic field diffraction by wind waves. When calculating the matrix of waveguide modes scattered by an agitated surface in oceanic waveguides, a two-scale surface wave model was used, in which the acoustic field is scattered by a resonance harmonic of waves, the phase velocity of which is modulated by larger waves. It is shown that when wind waves are undeveloped, i.e., the wave spectrum is nonisotropic and described by the JONSWAP model, the frequency matched filter response during observations of surface reverberations becomes asymmetric along the frequency axis and depends on the wind direction.