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Vessel Based Instruments: Acoustic Doppler Current Profiler (ADCP)
Instrument Type: RD Instruments 600-kHz Workhorse Mariner
Description: Acoustic Doppler Current Profiler (ADCP) produces a vertical profile of current velocities. The ADCP transmits sound at a fixed frequency and listens for the Doppler (frequency) shift in the echoes returning from sound scatters in the water. The ADCP uses multiple beams pointed in different directions to compute water velocities in three dimensions. Echoes with different delays allow measurements of current velocities at different depths.
Location: R/V Mussel Point, hull mounted centerline, aft of transom, forward of jets
Installed: March 2005
Specifications:
Velocity Accuracy: 0.3% of water velocity relative to ADCP ± 0.3 cm/s
Velocity Resolution: 0.1 cm/s
Velocity Range: ± 5 m/s
Range: < 50 m
Acquisition Settings:
Depth Cell Size: 1 m
Number of Depth Cells: 100
First Depth Cell: 2 m
Ambiguity Velocity: 330 cm/s
Short Term Average: 60 s
Long Term Average: 300 s
Profile Ping Normalization Reference Layer: Enabled (Start 3, End 10)
Heading Source: Internal compass
Tilt Source: Internal sensor
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