An ADCP measures the currents velocity and direction on a vertical profile.
Principle:
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Ultrasonic signal transmission of fixed frequency along several beams.
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signal partly reflected by the impurities in the water column.
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Frequency of received echo shifted by Doppler effect.
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This shift allows to compute the speed and direction of particles and therefore speed and direction of the currents.
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This processing occurs simultaneously at several water column levels and allows to record a current profile.
Some ADCP types allow, by precise analyze of orbital eddies generated by waves movements, to determine amplitudes period and direction of waves and swell.
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The ADCP can be installed on the seabed or close to the surface on a buoy or on a boat-hull, looking downwards.
Data can be recorded in situ in the memory of the equipment or transmitted on line to shore trough an acoustic and/or wireless modem.
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Real Time Utilization:
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Aid to marine navigation and vessel berthing and mooring.
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Sea conditions monitoring for worksite supervision, water sports, health and security of persons and goods.
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Aid to oceano-meteorological forecast.
Offline Utilization:
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Metocean data base design
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Structures Dimensioning
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Climatic Models
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