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1 December 2014 Numerical Modeling of Surf Zone Hydrodynamics over Movable Bed
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Abstract

Shin, S.; Cox, D., and Yoon, H.D., 2014. Numerical modeling of surf zone hydrodynamics over movable bed.

Understanding of hydrodynamics over moveable bed is crucial for predicting rip current generation. The capability of a numerical model based on Reynolds-averaged Navier–Stokes equations, COBRAS (COrnell BReaking waves And Structures), to simulate hydrodynamics over a movable barred beach was verified. The numerical simulation results were validated with the data collected from a large-scale two-dimensional experiment, which was conducted at the Hinsdale Wave Research Laboratory at Oregon State University. In this study, numerical model results were compared with the experimental results in terms of significant wave heights, wave setup, time-averaged horizontal velocities, and turbulent kinetic energy in different cross-shore locations. The COBRAS model successfully predicted the significant wave heights and setup from the offshore boundary to the vicinity of the bar location, but it slightly overestimated the significant wave heights when broken waves propagated to the shoreline. The numerical simulation was able to predict time-averaged horizontal velocities and turbulent kinetic energy well for all measurement locations. Overestimation of the turbulent kinetic energy at bar trough is because of the limitation of the turbulence closure scheme. Overall, based on the results of this study, the COBRAS model can be used to predict hydrodynamics in barred beaches, but improvement of the turbulence closure scheme is still required.

© 2014 Coastal Education and Research Foundation
Sungwon Shin, Daniel T. Cox, and Hyun Doug Yoon "Numerical Modeling of Surf Zone Hydrodynamics over Movable Bed," Journal of Coastal Research 72(sp1), 139-144, (1 December 2014). https://doi.org/10.2112/SI72-026.1
Received: 10 September 2014; Accepted: 27 October 2014; Published: 1 December 2014
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