GEOMETRIC CHARACTERISTICS OF WAVE-GENERATED SAND RIPPLES: A FULL-SCALE EXPERIMENTAL STUDY
AbstractIn the coastal environment, wave-induced sand ripples are usually observed under moderate near-bed flow conditions. Their occurrence significantly changes the local hydrodynamics and sediment transport processes. Over the past few decades, some solid progresses have been made towards understating the ripple dimensions under wave-generated near-bed flows, e.g., O'Donoghue et al. , but very few studies are targeted on the more detailed geometric characteristics, e.g., the generic shape of ripples and the sharpness of ripple crests, which are closely related to the coherent vortex structures. This study is aimed at filling this knowledge gap.
Du Toit, C. k. and J. Sleath (1981). Velocity measurements close to rippled beds in oscillatory flow" Journal of Fluid Mechanics 112: 71-96.
O'Donoghue, T., J. S. Doucette, J. J. van der Werf and J. S. Ribberink (2006). The dimensions of sand ripples in full-scale oscillatory flows" Coastal Engineering 53(12): 997-1012.
Yuan, J., W. Dongxu and O. S. Madsen (2017). A laser-based bottom profiler system for measuring net sediment transport rate in an oscillatory water tunnel. Proceedings of Coastal Dynamics.