MODELING SHEET FLOW UNDER BREAKING WAVES ON A SURF ZONE SANDBAR
AbstractWave-driven sediment transport is one of the main drivers of beach morphodynamics. However, the creation of a comprehensive numerical model remains to be a challenging task due to complex mechanisms associated with unsteadiness and free-surface effects. Particularly for highly non-linear and skewed-asymmetric breaking waves, the boundary layer approximation (i.e., assuming horizontal pressure gradient is equal to local free-stream acceleration) is questionable. Moreover, wave-breaking-induced turbulence may approach the bed and further enhance sediment transport. Thus, a numerical model that can resolve the entire water column from the bottom boundary layer to the free-surface can be a powerful tool to understand wave-driven sediment transport.
BerberoviÄ‡, van Hinsberg, JakirliÄ‡, Roisman, Tropea (2009): Drop impact onto a liquid layer of finite thickness: Dynamics of the cavity evolution, Phys. Rev., E79, 036306.
Cheng, Hsu, Calantoni (2017): SedFoam: A multi-dimensional Eulerian two-phase model for sediment transport and its application to momentary bed failure, Coastal Eng., 119, 32-50.
Jacobsen, Fuhrman, Fredsøe (2011): A wave generation toolbox for the open-source CFD library: OpenFoamâ"‡ , Int. J. Numer. Methods Fluids, 70(9), 1073-1088.
Kim, Cheng, Hsu, Mieras, Puleo (2017): A numerical investigation of sheet flow under non-breaking and breaking waves, Coast. Dyn. 2017, Helsingør, Denmark.
Mieras, Puleo, Anderson, Cox, Hsu (2017): Large-scale experimental observations of sheet flow on a sandbar under skewed-asymmetric waves, J. Geophys. Res. Oceans, 122, 5022-5045.