Abstract
A numerical model to predict the formation processes of dunes in open channel flows is developed. Flows and bed shear stresses over dunes are calculated by the depth averaged model considering the effect of vertical acceleration. Inotational condition of flows far from a dune bed and the acceleration/de-acceleration effect near a bed are included in the depth averaged model. Formation processes of dunes are simulated incorporating the nonequilibrium sediment transport model proposed by Nakagawa·Tsujimoto. Calculated results on the temporal development processes and shape characteristics of dunes are compared with previous theoretical and experimental studies. It is indicated that the calculated wave length caused by initial instability is coincident with the resonant relation of open channel flows over a wavy bed, and the wave length and height of dunes in the equilibrium state are dependent on the step length.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
