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Active intensity vortex and stagnation point singularities in a shallow underwater waveguide.

Peter H Dahl1, David R Dall'Osto1, William S Hodgkiss2

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Underwater acoustic vortex regions were studied using vector acoustics. Observations and modeling revealed these regions deepen with range due to sediment attenuation, confirming theoretical predictions.

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Area of Science:

  • Ocean acoustics
  • Underwater acoustics
  • Geoacoustics

Background:

  • Acoustic fields in underwater waveguides exhibit complex properties influenced by source characteristics and environmental factors.
  • Understanding acoustic intensity patterns, including vortex regions, is crucial for acoustic propagation modeling.

Purpose of the Study:

  • To investigate vector acoustic properties of a narrowband acoustic field as a function of range.
  • To study vortex regions and singular points of active acoustic intensity.
  • To compare observational data with interpretative modeling based on normal modes and geoacoustic models.

Main Methods:

  • Measurements of vector acoustic properties using a towed source in a shallow-water waveguide.
  • Analysis of acoustic pressure and velocity data, including inverse Hankel transforms for wavenumber spectra.
  • Comparison of observed data with a normal mode model using a geoacoustic profile.

Main Results:

  • Three trapped modes were supported at 43 Hz, with mode 2 weakly excited.
  • Vortex regions with singular points (vortex and stagnation points) were identified.
  • Model-data comparisons showed agreement, confirming vortex region properties.
  • Both observations and modeling indicated a gradual deepening of vortex regions with increasing range.

Conclusions:

  • Vector acoustics provide valuable insights into underwater acoustic field properties.
  • The study confirms the existence and behavior of acoustic vortex regions in a shallow-water environment.
  • Sediment attenuation plays a significant role in the observed deepening of vortex regions with range.