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A directional spectrum evolution model for wind-generated ocean noise.

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This study models wind-generated ocean noise as a directional spectrum excited at the sea surface. The subsurface noise structure is constrained by a radiation transport equation, showing sensitivity to environmental factors.

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Area of Science:

  • Oceanography
  • Acoustics
  • Environmental Science

Background:

  • Wind-generated ocean noise is traditionally described empirically.
  • Existing models depend on measurement depth and wind speed.
  • A new approach models noise as a slowly varying directional spectrum.

Purpose of the Study:

  • To model wind-generated ocean noise using a directional spectrum approach.
  • To analyze the subsurface structure of this noise.
  • To investigate the influence of environmental factors on noise propagation.

Main Methods:

  • Modeling wind-generated noise as a directional spectrum excited by dipole radiators at the sea surface.
  • Utilizing a radiation transport equation to constrain subsurface noise structure.
  • Initializing the model with empirical spectral density of downward propagating noise.
  • Employing a ray-based algorithm to solve the radiation transport equation.

Main Results:

  • Computed directional spectra illustrate sensitivity to receiver location.
  • Ocean sound speed structure significantly impacts noise propagation.
  • Seafloor bathymetry and geoacoustic bottom parameters influence subsurface noise.
  • The model provides a new framework for understanding wind-generated ocean noise.

Conclusions:

  • The directional spectrum model offers a more comprehensive understanding of wind-generated ocean noise.
  • Environmental factors play a crucial role in shaping underwater acoustic propagation.
  • This research advances the modeling of underwater acoustic environments.