Secondary flow and bed slope effects contributing to ill-posedness in river modelling

Abstract (2018)

Authors

V. Chavarrias Borras Rivers, Ports, Waterways and Dredging Engineering - CEG
W. Ottevanger Deltares
R.M.J. Schielen University of Twente, Rijkswaterstaat
A. Blom Rivers, Ports, Waterways and Dredging Engineering - CEG
Research Group
Rivers, Ports, Waterways and Dredging Engineering (CEG) (TU Delft)
Ill-posed problems 2D morphodynamics
More Info
expand_more

Published Date

2018

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Rivers, Ports, Waterways and Dredging Engineering

Abstract

Two-dimensional fl ow models are widely used and necessary to predict phenomena such as the dynamics of bars. In these problems the effect of the bed slope in the direction of the sediment transport rate needs to be accounted for to obtain physically realistic results. This effect is included using an empirical closure relation. Even including bed slope effects, 2D models do not capture 3D phenomena such as secondary fl ow which occurs when the fl ow curvature
is large. This process is accounted for in a parameterized manner including one equation to model the advection and diffusion of the secondary fl ow intensity.