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Direct measurement of vertical and longitudinal sediment fluxes on migratingsandy bedforms are extremely difficult to perform in both the field andlaboratory. In this study we use the LES--DEM (large eddy simulation--discreteelement method) solver SediFoam to examine the individual particle motions andresulting fluxes in a domain of self-generated dunes. In SediFoam, the motionsof, and collisions among, the sediment grains as well as their interactionswith surrounding turbulent flows are resolved. The numerical simulations areperformed over a range of transport settings, spanning bedform inceptionthrough washout conditions, to examine the individual particle dynamics. Thespace-time evolution of dune surfaces is demonstrated. The self-generated dunesare stable at relatively low Reynolds numbers, but then become increasinglyunstable at higher Reynolds numbers; eventually washing out as the number ofbypass grains and particles in suspension increase. Data from the simulationare used to examine the vertical entrainment rate of particles and thefractionation of total sediment load into bed and suspended fractions as afunction of transport conditions. The study also compares the sedimenttransport rate obtained using the bedform geometry and celerity to the truetransport rate at different transport stages.

Particle dynamics in self-generated dunes over a range of hydraulic and sediment transport conditions using LES--DEM