Modelling time varying scouring at bed sills

Auteur(s) et Affiliation(s)

TREGNAGHI, M.

School of Engineering, Design and Technology, Univ., Bradford, Royaume-Uni

MARION, A.

Dep. of Hydraulic, Maritime, Environmental and Geotechnical Engineering, Univ., Padua, Italie

BOTTACIN-BUSOLIN, A.

Water and Environmental technology (WET) Engineering S.r.l., Treviso, Italie

TAIT, S.J.

School of Engineering, Design and Technology, Univ., Bradford, Royaume-Uni

Description :
A modelling approach is presented to predict local scour under time varying flow conditions. The model is based on a number of hypotheses concerning the characteristics of the flow hydrograph, the temporal evolution of the scour and the geometry of the scour hole. A key assumption is that, at any time, the scour depth evolves at the same rate as in an equivalent steady flow. Experimental data are presented that show the scour hole development downstream of bed sills due to flood hydrographs follow a predictable pattern. Numerical simulations are performed with the same input parameters used in the experimental tests but with no post-simulation calibration. Comparison between the experimental and model results indicates good correspondence, especially in the rising limb of the flow hydrograph. This suggests that the underlying assumptions used in the modelling approach are appropriate.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 13, p. 1761-1769, nombre de pages : 9, Références bibliographiques : 48 ref.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais