selection guide for tide, current and waves
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Instrument Selection GuideFor tides, currents & waves
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Site DependentNo one type of instrument suits all types of sites. This guide reviews the possible platforms and the best instrument
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Bridge• Best location but can be difficult to get approvals to install. Fixed
position mounting. All non-contact instruments• Tide/Level = A Radar level sensor. Not ultrasonic – generally
short range and temperature influenced• Velocity = Surface velocity radar. Need multiple instruments for
wide rivers to cover range of seasonal flows. Velocity requires calibration to flow
• Waves = Generally not [email protected] linkedin.com/in/chrisgoding
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Riverbank or beach• Not without expensive civil works. • Recommend buoy or pylon mounting
instead
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Shore Mounted• Fixed position mounting. Generally in-situ instruments. Only
possible at locations with a rock, concrete, or weir type rigid structure
• Tide/Level = Hydrostatic level sensor. Unless an overhead structure is available, then follow the bridge site recommendations.
• Velocity = Side looking doppler current profiler• Waves = Generally not [email protected]
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Ports & Harbours• Fixed position mounting. A mounting point away from ships, such
as the dolphin in the photo above. Must be outside any hazardous zones
• Tide Only = Hydrostatic pressure sensor or Radar non contact• Tide & Current = Either sensor above with EMF current sensor (1
level) or Doppler profiler for current profiles• Tide, Current & Waves = Bottom mounted Doppler [email protected]
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Fixed or Floating Structures• Tide = RTK-GPS (no bottom mounted
instruments, <5km from shore) otherwise bottom mounted pressure sensor (higher accuracy, assumes structure does not rotate)
• Current = BuoyEMF for surface currents or down looking ADCP for current profiles
• Waves = RTK-GPS for operational purposes OR Bottom mounted ADCP for research purposes
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BuoysWhere no fixed mounting location exists.• Tide = RTK-GPS (no bottom mounted
instruments, <5km from shore) otherwise bottom mounted pressure sensor (higher accuracy, 2 point mooring)
• Current = BuoyEMF for surface currents or Buoy mounted ADCP for current profiles
• Waves = RTK-GPS for operational purposes OR Bottom mounted ADCP for research purposes (requires 2 or 3 point mooring and maintenance)
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Instrument Selection GuideEach instrument is selected to suit the possible location and the performance requirements. Contact us for advice on your specific sites
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