Print Email Facebook Twitter The effect of river dunes on the morphodynamic response to overloading Title The effect of river dunes on the morphodynamic response to overloading Author Blom, A. Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 2010-09-08 Abstract A new two-layer model for conservation of mixed sediment for bedform-dominated condi-tions is proposed. There is a need for such a new bedlayer-type sediment conservation model, as (i) the commonly applied Hirano (1971) model does not account for the effects of bedform stochastics and ver-tical sorting on bed level changes, (ii) the Ribberink two layer model is not sufficiently generic, and (iii) the stochastic Blom et al (2008) sorting evolution model is cumbersome and requires a very small numer-ical time step. The new two-layer model is a combination of two sediment conservation models for mixed sediment: the Ribberink (1987) two layer model and the stochastic Blom et al. (2006) equilibrium sorting model. It incorporates the effects of both stochastics of bedform geometry and vertical sorting in the pre-diction of bed level changes in a parameterized form. After validating the new model against an aggrada-tional flume experiment, we study the morphodynamic response to an excessive sediment supply (over-loading) computed by the new two layer sediment conservation model and the commonly applied Hirano model in elementary numerical computations. Subject bedformsmorphodynamicspredictionssediment conservation To reference this document use: http://resolver.tudelft.nl/uuid:706543ee-5e8f-4b46-a7db-c5ae257e3978 Publisher Bundesanstalt für Wasserbau ISBN 978-3-939230-00-7 Source River Flow 2010: Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, 8-10 September 2010 Part of collection Institutional Repository Document type conference paper Rights (c) 2010 Blom, A. Files PDF 260566.pdf 717.64 KB Close viewer /islandora/object/uuid:706543ee-5e8f-4b46-a7db-c5ae257e3978/datastream/OBJ/view