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A multifrequency scintillation method for ocean flow measurement.

I Fuks1, M Charnotskii, K Naugolnykh

  • 1Environmental Technology Laboratory, University of Colorado, CIRES/NOAA, Boulder 80305, USA.

The Journal of the Acoustical Society of America
|June 27, 2001
PubMed
Summary

This study introduces a frequency-domain method for measuring ocean current velocity by analyzing acoustic signal fluctuations. The technique leverages signal coherence to map fluid advection and ocean fine structure.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Oceanography

Background:

  • Transverse flow of inhomogeneous fluids causes acoustic signal fluctuations.
  • Signal coherence relates to medium advection, enabling current velocity measurement.
  • This frequency-domain approach is analogous to space-domain scintillation methods.

Purpose of the Study:

  • To develop and analyze a multifrequency method for transverse current probing.
  • To investigate the sensitivity of this method to ocean fine structure.
  • To assess the impact of internal waves and turbulence on acoustic signal coherence.

Main Methods:

  • Analyzing the coherence function of frequency-spaced acoustic signals.
  • Simulating signal propagation through frozen and moving internal wave fields.

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  • Considering acoustic propagation through turbulent fluid environments.

    • Main Results:

    • The coherence of frequency-spaced signals provides a basis for current velocity measurement.
    • Method sensitivity is influenced by ocean fine structure, including internal waves and turbulence.
    • Multifrequency signals enable simultaneous estimation of fine-structure parameters and current velocity.

    Conclusions:

    • The frequency-domain method offers a novel approach to acoustic current velocity measurement.
    • Understanding ocean fine structure is crucial for optimizing this measurement technique.
    • Multifrequency acoustic analysis can provide comprehensive insights into ocean dynamics.