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Calculating wave orbital velocity from Acoustic Doppler Velocimeter data

dataset
posted on 2024-06-27, 08:32 authored by Cai Ladd, Alejandra Vovides, T. (Thorsten) Balke, Marie Christin-Wimmler, Christian Schwarz

This dataset was used to derive near-bottom wave orbital velocities using two methods: linear wave theory and direct velocity measurements. Both methods were then used to compare calibrations between velocity and acceleration data gathered by low-cost and open-source bottom-mounted floats called ‘Mini Buoys’. The dataset contains water velocity data gathered by Acoustic Doppler Velocimeters, and acceleration data gathered from the B4+ Mini Buoy design.

Data collection method: Data to build a calibration between wave orbital velocity and acceleration was gathered at Caerlaverock, Scotland (54°58′05′′ N, 3°31′58′′ W) and Black Scar, Wales (51°45′54′′ N, 4°26′12′′ W).

Acceleration

B4+ Mini Buoys sampled y-axis acceleration at 1 Hz within 5 m of an ADV.

Velocity

Wave orbital velocities were measured using an ADV. Height of the ADV pressure sensor and velocity cell being measured above the bed at Black Scar was 4 and 30 cm respectively. For the ADV deployed at Caerlaverock, the pressure sensor and velocity cell were 9 and 32 cm above the tidal flat respectively. Velocities were recorded at a rate of 16 Hz in 13-minute bursts every 30 minutes at Black Scar and 1Hz frequency in 20-minute bursts every 1 hour at Caerlaverock. Nominal velocity range was set to 0.3 m/s and ‘Surf Zone’ default settings were used.

Data processing:

Acceleration

No processing was done to the acceleration data.


Velocity

Mean beam correlation of all three receiver arms was calculated.

Funding

UK Research and Innovation, Grant/Award Number: NE/S008926/1

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