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1 December 2014 Observation of Rip Current Velocity at an Accidental Event by using Video Image Analysis
Sung Bum Yoon, Won Kyung Park, Junwoo Choi
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Yoon, S.B.; Park, W.K., and Choi, J., 2014. Observation of rip current velocity at an accidental event by using video image analysis.

In order to investigate the magnitude of rip currents of an accident event, in which dozens of people were rescued by coast guards at Haeundae beach, the floating velocities of swimming tubes of people caught by the rip current were estimated by using an analysis of video camera images. The analysis was conducted by tracking the locations of the floating tubes in the video images, converting the image coordinate system into the conventional map coordinate system, and evaluating their Lagrangian velocities. The rip current was strongly developed southwardly from the shore at the center of the beach and its maximum velocity was about 1.12 m/s when observing waves with Hs =0.9 m, Ts=8.2 sec, and θp =S4°E. The observation results was used for a verification of the numerical simulation performed using the nonlinear Boussinesq model FUNWAVE which can resolve wave-phase interactions and simulate rapid wave-induced currents with generation, evolution, and dissipation of vortex pairs. The observation and the computation reasonably agreed with each other.

© 2014 Coastal Education and Research Foundation
Sung Bum Yoon, Won Kyung Park, and Junwoo Choi "Observation of Rip Current Velocity at an Accidental Event by using Video Image Analysis," Journal of Coastal Research 72(sp1), 16-21, (1 December 2014).
Received: 10 September 2014; Accepted: 27 October 2014; Published: 1 December 2014
Haeundae Beach.
numerical simulation
rip current
video image
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