A LSPIV Measurement of the Unsteady Rip Current at Successive Ends of Breaking Wave Crests

Junwoo Choi
2020 Journal of Korean Society of Coastal and Ocean Engineers  
The experiment of unsteady rip current generated at the successive ends of breaking wave crests of honeycomb pattern waves was conducted in a laboratory wave basin, and its time-varying evolution was observed by using ortho-rectified images. The present experiment utilized the generation of a quasi nodal line of the honeycomb-pattern waves formed by out-of-phase motion of two piston-type wavemakers arranged in the transverse direction, instead of the original honeycomb pattern waves which are
more » ... n waves which are generated when two wave trains propagate with slightly different wave directions. The velocities of rip current were measured by using the LSPIV (Large-Scale Particle Image Velocimetry) technique. As a result, the unsteady rip current was generated between successive ends of wave crests, and evolved with its shear fluctuations in this experiment. Also, the time series of LSPIV velocity of the unsteady rip current showd its short component due to waves and its long component due to waveinduced currents.
doi:10.9765/kscoe.2020.32.6.411 fatcat:fdoj4zvkyvhhfphk7ata2r6mmi