The accumulation of sediments in sewers is responsible for various hydraulic and environmental problems. Among the existing cleansing devices, flushing gates have recently proven to be a valid cost-effective solution for the cleansing of sediments. This paper reports the results of the numerical modelling of sediment flushing in a combined sewer reach. Simulations were performed using a numerical model based on the solution of the De Saint Venant-Exner equations by the TVD MacCormack scheme. The model, which had been initially validated against data derived from several laboratory experiments, was compared with the results of the field experimental campaign carried out in the Lacassagne trunk sewer in Lyon (France), where a Hydrass flushing gate had been put into operation in 2003 to remove sediments accumulated during 3 years. The model is able to reproduce correctly the global evolution of the sediment profiles as they change with the number of flushes.

Modelling the flushing of sediments in a combined sewer

CREACO, Enrico Fortunato;
2007

Abstract

The accumulation of sediments in sewers is responsible for various hydraulic and environmental problems. Among the existing cleansing devices, flushing gates have recently proven to be a valid cost-effective solution for the cleansing of sediments. This paper reports the results of the numerical modelling of sediment flushing in a combined sewer reach. Simulations were performed using a numerical model based on the solution of the De Saint Venant-Exner equations by the TVD MacCormack scheme. The model, which had been initially validated against data derived from several laboratory experiments, was compared with the results of the field experimental campaign carried out in the Lacassagne trunk sewer in Lyon (France), where a Hydrass flushing gate had been put into operation in 2003 to remove sediments accumulated during 3 years. The model is able to reproduce correctly the global evolution of the sediment profiles as they change with the number of flushes.
2007
2950933793
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1409547
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