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Journal of Korean Society of Coastal and Ocean Engineers > Volume 32(6); 2020 > Article
J Korean Soc Coast Ocean Eng 2020;32(6): 411-419. doi: https://doi.org/10.9765/KSCOE.2020.32.6.411
연속된 쇄파 파봉선 끝단의 비정상 이안류 LSPIV 계측연구
한국건설기술연구원 해안항만연구실 연구위원
A LSPIV Measurement of the Unsteady Rip Current at Successive Ends of Breaking Wave Crests
Junwoo Choi
Research Fellow, Coastal and Harbor Research Division, Korea Institute of Civil Engineering & Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si, Gyeongggi-do 10223, Korea
Corresponding author: Junwoo Choi ,Tel: +82-31-910-0772, Email: jwchoi@kict.re.kr
Received: November 10, 2020;  Revised: November 30, 2020.  Accepted: November 30, 2020.
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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 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 wave-induced currents.
Keywords: Laboratory experiment, breaking wave crests, honeycomb patterned waves, unsteady rip current, LSPIV
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