CROSSTEX - Wave breaking, Boundary Layer Processes, the Resulting Sediment Transport and Beach Profile Evolution
2006
Hsu, Tian-Jian | Trowbridge, John
Two numerical models focused on different scales are revised and extended to model surf zone hydrodynamics and sand transport driven by random waves in order to test with data measured during CPOSSTEX and other field experiments. The two-phase model is successfully revised to be driven by measured time series of wave-current velocities and breaking wave turbulence during CROSSTEX experiment. When breaking wave turbulence is incorporated, the model is able to predict the strong suspension event observed during CROSSTEX. The new model will be used to study and evaluate the effect of breaking wave turbulence on sediment transport fluxes. A 2nd order implicit scheme is implemented into the 2D PANS wave model (COBRAS). The new model is more numerically stable and accurate. We find that with a more accurate scheme, the predicted breaking wave turbulence kinetic energy is generally 30 to 100% smaller than the original 1$%order explicit scheme. Hence, this new scheme will improve our future plan to use COBRAS to study surf zone sediment transport.
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