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Novel Deep-Water Tidal Meter for Offshore Aquaculture Infrastructures.

Javier Sosa1, Juan-A Montiel-Nelson1

  • 1Institute for Applied Microelectronics (IUMA), University of Las Palmas de Gran Canaria, 35015 Las Palmas de Gran Canaria, Spain.

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A new tidal current meter uses inertial acceleration for offshore aquaculture. This ultra-low-power device achieved over 180 days of operation with <1% error, outperforming existing technologies.

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Area of Science:

  • Oceanography
  • Marine Engineering
  • Sensor Technology

Background:

  • Offshore infrastructures, particularly in aquaculture, require accurate tidal current monitoring.
  • Existing tidal measurement systems often face limitations in power consumption and deployment duration.
  • Deep-water applications necessitate robust and efficient measurement solutions.

Purpose of the Study:

  • To develop and validate an ultra-low-power tidal current meter for offshore aquaculture.
  • To assess the feasibility of using inertial acceleration for tidal force measurement at depth.
  • To analyze the long-term performance and accuracy of the developed device.

Main Methods:

  • Utilized the inertial acceleration principle with a commercial MEMS triaxial accelerometer.
  • Developed and deployed a prototype tidal measurement unit on an offshore aquaculture infrastructure.
  • Recorded acceleration data at 15 m depth over extended periods (short, medium, and long term).
  • Analyzed data in time and frequency domains to understand tidal current dynamics.

Main Results:

  • The prototype operated continuously for over 180 days on a single lithium-ion battery, exceeding alternatives by three times.
  • Achieved a measurement accuracy error below 1% and a resolution of 0.01 cm/s.
  • Demonstrated performance comparable to state-of-the-art Doppler-based solutions.
  • Data analysis confirmed the device's capability to measure tidal current frequencies.

Conclusions:

  • The proposed inertial acceleration-based tidal current meter is a viable, ultra-low-power solution for offshore applications.
  • The device offers extended operational duration and high accuracy, suitable for long-term monitoring in aquaculture.
  • This technology presents a significant advancement for deep-water marine infrastructure monitoring.