Passive acoustic measurement of flow velocity in the Straits of Florida

Oleg A. Godin, Michael G Brown, Nikolay A. Zabotin, Liudmila Y. Zabotina, Neil J. Williams

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Group speed of sound in moving fluids depends on the propagation direction, which breaks acoustic reciprocity. Acoustic nonreciprocity provides a means to measure fluid motion. Using nonreciprocity, one can measure fluid velocities that may be small compared to uncertainties in sound speed. Interferometry of diffuse acoustic noise, with receivers replacing the transceivers employed in active techniques, offers a simple, low-cost means of measuring nonreciprocity. Here, the feasibility of using passive measurements of acoustic nonreciprocity to estimate current velocity in the ocean is experimentally demonstrated for the first time. Estimates of depth-averaged flow velocity are retrieved from cross-correlations of low-frequency noise recorded in the Straits of Florida by near-bottom hydrophones separated by 5 and 10 km.

Original languageEnglish (US)
Article number16
JournalGeoscience Letters
Volume1
Issue number1
DOIs
StatePublished - Dec 1 2014

Keywords

  • Acoustic oceanography
  • Florida current
  • Noise interferometry
  • Ocean acoustic tomography
  • Passive remote sensing
  • Reciprocity in acoustics

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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