Estimation of bed protection damage using numerical flow modelling

Estimation of bed protection damage using numerical flow modelling

Hoan, N.T.
Booij, R.
Hofland, B.
Stive, M.J.F.
Verhagen, H.J.

Civil Engineering and Geosciences

Hydraulic Engineering

2008-01-01

The current research is aimed at evaluating the applicability of a numerical flow model to predict bed damage. First, an experimental study was carried out to get more inside into the relation between flow forces acting on a bed and the bed response (damage). The experiments were then used as the basis for the evaluation. Second, the flow was modeled using Deft incompressible flow solver developed at Delft University of Technology. Comparison between measurements and calculations of the flow fields shows a good agreement. The velocity distribution is reproduced very well while in most cases the turbulence intensity is underestimated in the bottom region. The measured and calculated stability parameters are in good agreement (error within ±10% ) though. The calculated bed damage (dimensionless entrainment rate, ?E ) has larger error (within ±50% ) due to its high sensitivity to the value of the stability parameters. However, this is reasonably good for bed damage prediction as the measurement of ?E already has an error within ±100% compared to its mean value.

bed stability
decelerated flow
shields
bed roughness

http://resolver.tudelft.nl/uuid:4a5c608d-daba-4b43-9c5e-292eb594f6be

Copedec

Proceedings of the International Conference on Coastal and Port Engineering in Developing Countries, COPEDEC VII, 2008, Dubai

Institutional Repository

conference paper

© 2008 TU Delft