Author(s): David F. Hill; Brian D. Younkin PhD

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Keywords: Bed shear stresses; Boundary layers; Scour; Sediment transport; Turbulent jets

Abstract: A simple procedure for predicting the time evolution and equilibrium size of the two dimensional bedform created by a turbulent wall jet is presented. The model applies to a planar jet discharging flush with and parallel to an initially horizontal bed of cohesionless sediment. Additionally, the water is assumed to be deep relative to the initial jet thickness. The model is developed using existing free- and wall-jet boundary layer relations and existing sediment incipient motion and bedload transport equations. The model is validated against live-bed experiments from previous studies and from a new set of laboratory experiments. The agreement between the predictions for and observations of equilibrium size is quite good. The agreement regarding the time evolution is also good. These results suggest that several key characteristics of jet-induced bedforms are captured with a limited physical approach.

DOI: https://doi.org/10.3826/jhr.2009.3469

Year: 2009