HF radar Lagrangian trajectory calculations accounting for Stokes’ drift and the nonlinear Bragg wave phase speed correction term
Calculations of the nonlinear correction term (filtered Stokes’ drift) of the Bragg wave phase speed and the full surface Stokes’ drift require a full directional-energy ocean wave spectrum. Wavewatch III (WWIII) hindcast reanalysis provides full spectra only at buoy locations and a partitioned data set of wave parameters covering most areas of HF radar coverage. Reconstruction of the full spectrum using the partitioned data set is used to calculate Stokes’ drift and filtered Stokes’ drift, which is found to compare favorably to calculations using the full spectrum at buoy locations from WWIII both in the South Atlantic Bight and the Southern California Bight. This reconstruction method is used for Stokes’ drift and filtered Stokes’ drift calculations over the HF radar coverage area in Long Bay for Lagrangian trajectory calculations.