Coupled fully 3D numerical modelling of local sediment flushing scour at dam bottom outlet
- 1ère Edition de Workshop sur la modélisation des systèmes complexes : 8-9
Résumé
Reservoir sedimentation is not only a serious threat to water storage capacity, but it could also undermine some hydraulic structures such as hydropower intakes and bottom outlets. This paper first describes the development of a coupled fully three-dimensional (3D)
numerical model for the prediction of the local pressured sediment flushing scour upstream of the bottom outlet. The presented numerical model solves Navier-Stokes equations in conjunction with the k - ɛ turbulent model which include both sediment transport and hydrodynamic parameters. The proposed coupled fully 3D numerical model is later used to simulate an experimental test based on non-cohesive sediments. Results from these simulations are in good agreement with the measurements in terms of the geometric features of the scour hole.
Mots-clés
Reservoir sedimentation, hydraulic modelling, sediment transport modelling, CFD (Computational Fluid Dynamics), local scour.