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Numerical Simulation of Regular Wave Transformation due to Wave-induced Current over a Submerged Elliptic Shoal  

Choi, Jun-Woo (Dept. of Civil Engineering, Hanyang University at Ansan)
Baek, Un-Il (Dept. of Civil Engineering, Hanyang University at Ansan)
Yoon, Sung-Bum (Dept. of Civil & Environ.)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.19, no.6, 2007 , pp. 557-564 More about this Journal
Abstract
The effect of wave and current interactions on regular wave transformation over a submerged elliptic shoal is investigated based on numerical simulations of the Vincent and Briggs experiment [Vincent, C.L., Briggs, M.J., 1989. Refraction-diffraction of irregular waves over a mound. Journal of Waterway, Port, Coastal and Ocean Engineering, 115(2), pp. 269-284]. The numerical simulations are conducted by constituting two numerical model systems: a combination of SWAN(a wave model) plus SHORECIRC(a current model) and a combination of REF/DIF 1(a wave model) plus SHORECIRC. A time dependent phase-resolving wave-current model, FUNWAVE, is also utilized to simulate the experiment. In the simulations, the breaking-induced currents defocus waves behind the shoal and bring on a wave shadow zone that shows relatively low wave height distributions. The computed results of the two model systems agree better with the measurements than the computed results obtained by neglecting wave-current interaction do. However, it is found that the radiation stresses for standing waves are misevaluated in the wave models. In addition, the results of FUNWAVE show very good agreement with the measurements. The agreement indicates that it is necessary to take into account the effect of breaking-induced current on wave refraction when wave-breaking occurs over a submerged shoal.
Keywords
submerged elliptic shoal; wave-breaking-induced current; wave-current interaction; regular wave transformation;
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