Author(s): A. Carravetta; R. Della Morte; M. Greco
Linked Author(s):
Keywords: Sediment removal; Fixed bed; Numerical model; Unsteady friction
Abstract: Sediment removal from a fixed bed is a problem having large implications in sewer and open channel design. There is a large experimental evidence that particle motion starts for bed shear velocities much smaller than the ones predicted by Shields theory and that the sediment transport rate is larger than the one on a mobile bed. The experiments of one of the writers confirm these evidences. An innovative quasi-3D model described in the paper, including additional bottom shear stress due to the unsteadiness produced by the large scale vortex, can predict transport, erosion and deposition of sediment on a fixed bed. Model results reported in the paper are in good agreement with experiments.
Year: 2001