The present study consists of a new mathematical-experimental investigation on local scour downstream of a rigid bed. New scouring experiments, under both steady and unsteady flow conditions, were carried out and the scour patterns were measured with a 3D Laser Scanner. The initial bed shear stress induced by the turbulent flow over the sand bed was estimated by analysing velocity profiles. A mathematical model simulating the local scour downstream of a rigid bed and using both information relating to the turbulent flow and the physical and mechanical properties of the sand was developed. The mathematical structure of the model includes a second order partial differential parabolic equation with the shape of the mobile bed as unknown parameter. The sediment transport was computed by the Einstein approach. The space-time evolution of the simulated scour holes are in good agreement with the measured ones for both steady and unsteady flow tests.

An experimental and numerical study on the spatial and temporal evolution of a scour hole downstream of a rigid bed

CALOMINO, Francesco;GAUDIO, Roberto;
2014

Abstract

The present study consists of a new mathematical-experimental investigation on local scour downstream of a rigid bed. New scouring experiments, under both steady and unsteady flow conditions, were carried out and the scour patterns were measured with a 3D Laser Scanner. The initial bed shear stress induced by the turbulent flow over the sand bed was estimated by analysing velocity profiles. A mathematical model simulating the local scour downstream of a rigid bed and using both information relating to the turbulent flow and the physical and mechanical properties of the sand was developed. The mathematical structure of the model includes a second order partial differential parabolic equation with the shape of the mobile bed as unknown parameter. The sediment transport was computed by the Einstein approach. The space-time evolution of the simulated scour holes are in good agreement with the measured ones for both steady and unsteady flow tests.
978-1-138-02674-2
Scour; Fixed bed; Mathematical modelling
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/166740
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