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Experimental and Numerical investigation of Flushing in Combined sewer Networks – Case study of a Parisian Trunk Sewer

Abstract : Sediment accumulation on the invert of sewer channels has been recognized as one of the important sources of problems for the management of sewer networks. In the two most recent decades, flushing has been put forward as one of the most common methods of sewer cleaning, to limit sediment accumulation especially in large trunk sewers. Sewer sediment transport processes are not fully understood yet, due to numerous unknown variables and difficult measuring conditions. The current research aimed firstly to setup a field experimental campaign to obtain high-quality data. This data allowed understanding of the processes associated with flushing operation in sewers. In addition, this study aimed to model the flushing processes properly in order to set-up an adequate and practical numerical tool able to predict sediment removal of flushing in the sewer network of Paris. To this purpose, two models were used: (i) a simple model for uniform sediment transport, which is the most common used approach; and (ii) a more complex model for non-uniform sediment transport of mixtures. A comparative analysis was carried out to highlight advantages and drawbacks of either. Overall, the results pointed out that the numerical modelling is able to reproduce faithfully hydrodynamics and sediment transport during flushing operations. In fact, both models enabled evaluation of flush behaviour and associated sediment transport. However, despite its higher complexity and computational burden, the latter model provides better insight into the prediction of the removal effectiveness of flushes.
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Submitted on : Wednesday, April 24, 2019 - 3:51:56 PM
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Gashin Shahsavari. Experimental and Numerical investigation of Flushing in Combined sewer Networks – Case study of a Parisian Trunk Sewer. Engineering Sciences [physics]. Université Sorbonne Paris Cité, 2018. English. ⟨tel-02109107⟩

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