AN EVALUATION OF SUSPENDED SEDIMENT CONCENTRATION MODELS UNDER BREAKING WAVES
AbstractImplementing the effects of turbulent kinetic energy (TKE) is essential in producing accurate suspended sediment concentration (SSC) models, especially under breaking wave conditions. SSC is commonly attributed to two different turbulent sources under breaking wave conditions: 1) bed-friction and 2) breaking-induced turbulent vortices. Numerous studies have endeavoured to quantify the effects of TKE and incorporate them into SSC models. To name a few: Mocke & Smith (1992, henceforth MS92), Shibayama & Rattanapitikon (1993, henceforth SR93), Jayaratne & Shibayama (2007, henceforth JS07), and Yoon et al. (2015, henceforth Y15). The present study evaluates these 4 existing SSC models and validates them against recently published datasets from the â€˜CROSSTEX' (Yoon & Cox, 2010), â€˜SandT-Pro' (Ribberink et al., 2014) and â€˜SINBAD' (vdZ et al. 2015) projects. Following critical evaluation, suggestions are made to enhance existing SSC models, and these findings are then incorporated into producing two new SSC models that indicate improved accuracy.
Beach, Sternberg, (1996): Suspended-sediment transport in the surf zone: Response to breaking waves. Continental Shelf Research 16(15), pp. 1989-2003.
Jayaratne, Shibayama, (2007): Suspended sediment concentration on beaches under three different mechanisms, Coastal Engineering Journal, World Scientific, vol. 49, pp. 357-392.
Mocke, Smith, (1992): Wave breaker turbulence as a mechanism for sediment suspension. Proc. 23rd ICCE, pp. 2279-2292
Nadaoka, Hino, Koyano (1989): Structure of the turbulent-flow field under breaking waves in the surf zone. Journal of Fluid Mechanics 204, pp. 359-387.
Peregrine, Svendsen (1978): Spilling breakers, bores and hydraulic jumps, Proc. 16th ICCE, pp. 540-550.
Ribberink, Van der A, Van der Zanden, O'Donoghue, Hurther, Cáceres, Thorne, (2014): SandT-Pro: Sediment transport measurements under irregular and breaking waves, Proc. 34th ICCE, Sediment.1.
Sato, Homma, Shibayama, (1990): Laboratory study on sand suspension due breaking waves. Coastal Engineering in Japan, JSCE, 33(2), pp. 219-231.
Shibayama, Rattanapitikon, (1993): Vertical distribution of suspended sediment concentration in and outside surf zone, Coastal Engineering in Japan, JSCE, 36, pp. 49- 65.
Van der Zanden, Van der A, Ribberink, O'Donoghue, Hurther, Cacares, Thorne, (2015): Sand transport process measurements under large-scale breaking waves, Coastal Sediments 2015, World Scientific. pp. 1- 14
Yoon, Cox, (2012): Cross-shore variation of intermittent sediment suspension and turbulence induced by depth limited wave breaking. Continental Shelf Research 47, pp. 93-106.
Yoon, Cox, (2010): Largeâ€scale laboratory observations of wave breaking turbulence over an evolving beach, Journal of Geophysical Research - Oceans, 115.
Yoon, Cox, Mori, (2015): Parameterization of time-averaged suspended sediment concentration in the nearshore, Water, MDPI, 7(11), pp. 6228-6243.