A surface kinematics buoy (SKIB) for wave–current interaction studies
|Author(s)||Veras Guimaraes Pedro1, 2, Ardhuin Fabrice5, Sutherland Peter6, Accensi Mickael6, Hamon Michel6, Perignon Yves2, Thomson Jim3, Benetazzo Alvise4, Ferrant Pierre2|
|Affiliation(s)||1 : Univ Brest, CNRS, IFREMER, IRD,LOPS, F-29280 Plouzane, France.
2 : Ecole Cent Nantes, LHEEA Lab, UMR6598, F-44300 Nantes, France.
3 : Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA.
4 : ISMAR, I-2737 Venice, Italy.
|Source||Ocean Science (1812-0784) (Copernicus Gesellschaft Mbh), 2018-11 , Vol. 14 , N. 6 , P. 1449-1460|
|WOS© Times Cited||5|
Global navigation satellite systems (GNSSs) and modern motion-sensor packages allow the measurement of ocean surface waves with low-cost drifters. Drifting along or across current gradients provides unique measurements of wave–current interactions. In this study, we investigate the response of several combinations of GNSS receiver, motion-sensor package and hull design in order to define a prototype “surface kinematics buoy” (SKIB) that is particularly optimized for measuring wave–current interactions, including relatively short wave components that are important for air–sea interactions and remote-sensing applications. The comparison with existing Datawell Directional Waverider and Surface Wave Instrument Float with Tracking (SWIFT) buoys, as well as stereo-video imagery, demonstrates the performance of SKIB. The use of low-cost accelerometers and a spherical ribbed and skirted hull design provides acceptable heave spectra E(f) from 0.09 to 1 Hz with an acceleration noise level (2πf)4E(f) close to 0.023 m2 s−3. Velocity estimates from GNSS receivers yield a mean direction and directional spread. Using a low-power acquisition board allows autonomous deployments over several months with data transmitted by satellite. The capability to measure current-induced wave variations is illustrated with data acquired in a macro-tidal coastal environment.