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SailBuoy Ocean Currents: Low-Cost Upper-Layer Ocean Current Measurements.

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This study presents the SailBuoy, an unmanned vehicle for measuring ocean currents using an acoustic Doppler current profiler (ADCP). It shows promising correlations with traditional methods, though high sea conditions present challenges.

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Area of Science:

  • Oceanography
  • Marine Technology
  • Instrument Development

Background:

  • Traditional ocean current measurement methods can be resource-intensive.
  • There is a need for autonomous and cost-effective oceanographic monitoring solutions.

Purpose of the Study:

  • To introduce and validate the SailBuoy, an unmanned surface vehicle (USV), as an alternative method for measuring ocean currents.
  • To assess the performance of the SailBuoy's integrated acoustic Doppler current profiler (ADCP) against established techniques.

Main Methods:

  • Deployment of the SailBuoy, an autonomous USV powered by wind and solar energy.
  • Navigation to predefined waypoints for data collection.
  • Recording ocean current velocity profiles using an integrated downward-looking ADCP.
  • Comparison of SailBuoy data with traditional methods: bottom-mounted, moored current profilers, and moored single-point current meters.

Main Results:

  • Satisfactory correlation observed between SailBuoy current records and traditional observation techniques.
  • Highest correlations achieved during tidal signals, strong currents, and calm weather.
  • Reduced correlation noted under low current speeds and high wave/wind conditions.
  • A systematic offset of ±0.03 m/s was observed between SailBuoy and reference instruments.

Conclusions:

  • The SailBuoy offers a viable alternative for ocean current measurement, particularly in favorable conditions.
  • Filtering data from high sea surface roughness events may improve ADCP performance.
  • Further investigation is needed to resolve the systematic measurement offset, potentially due to instrument differences or environmental noise.