Sediment transport may occur during fast geomorphic transients as a consequence of strong upward momentum fluxes due to turbulence and/or of intense erosion of a loose bed. Under these circumstances, sediments will move with the distinctive features of bed-load in the region close to the bottom, whereas suspended sediment will follow the carrying fluid in the upper region of the flow. The paper presents a two-phase model able to describe both bed and suspended loads. While bed-load dynamics is modeled con-sidering the particle-bottom and particle-particle collisions and drag received by the fluid, the suspended one is considered just advected by carrying flow. The model is applied to analyzed the dam-break waves over erodible beds of light sediment. The numerical results reproduce the main features of the experiment, putting in evidence the different dynamics of bed and suspended loads.

Two-phase modelling of total sediment load in fast geomorphic transients

LEOPARDI, Angelo;
2012

Abstract

Sediment transport may occur during fast geomorphic transients as a consequence of strong upward momentum fluxes due to turbulence and/or of intense erosion of a loose bed. Under these circumstances, sediments will move with the distinctive features of bed-load in the region close to the bottom, whereas suspended sediment will follow the carrying fluid in the upper region of the flow. The paper presents a two-phase model able to describe both bed and suspended loads. While bed-load dynamics is modeled con-sidering the particle-bottom and particle-particle collisions and drag received by the fluid, the suspended one is considered just advected by carrying flow. The model is applied to analyzed the dam-break waves over erodible beds of light sediment. The numerical results reproduce the main features of the experiment, putting in evidence the different dynamics of bed and suspended loads.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11580/24599
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