Experimental and numerical modelling of sedimentation in a rectangular shallow basin

Kantoush, Sameh A.; Bollaert, E.; Schleiss, Anton

doi:10.1016/s1001-6279(08)60020-7

Cited by 37 publications

(23 citation statements)

References 18 publications

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“…Three-dimensional turbulence processes are partly accounted for through the two-length scale k-ε turbulence closure, as detailed below. Complementarily, in experimental work of Kantoush (2008) with a similar geometric setup, measured vertical velocity components using ultrasonic velocity profiler were verified to remain low compared to velocity components in the horizontal plane (Kantoush et al, 2008a) and two-dimensional numerical models were applied (Kantoush et al, 2008b), yet without careful consideration for the inflow boundary conditions as done here and in our previous work (Dewals et al, 2008). In the shallow-water approach, the friction makes the link between the bed shear stress and the depth-averaged velocity.…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical Investigation of Flow Patterns in Rectangular Shallow Reservoirs

Dufresne

Dewals

Erpicum

et al. 2011

Engineering Applications of Computational Fluid Mechanics

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In this study, the capability of a two-dimensional shallow-water numerical model to simulate the symmetric and asymmetric flows that can take place in rectangular shallow reservoirs with different lateral expansion ratios and dimensionless lengths is investigated. Numerically, the main difficulty is to properly reproduce the transition between symmetric and asymmetric flows. For a large lateral expansion ratio, the use of two protocols of simulation highlighted a high sensitivity of the simulated flow pattern to the initial condition. Comparison between simulated results and experimental data showed a good agreement for the critical shape parameter (combination of the lateral expansion ratio and the dimensionless length) between symmetric and asymmetric flows. A good agreement was also found for the value of the shorter reattachment length of asymmetric flows. For small lateral expansion ratios, the agreement was not so good. The model was used for even larger lateral expansion ratios in order to numerically extend the experimental dataset. This predictive work showed that the shape parameter, whose expression was only based on experiments carried out for small lateral expansion ratios, was also relevant for larger values. Moreover, the predicted values of the shorter reattachment length were also consistent with a regression only based on experimental results.

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Section: Numerical Modelmentioning

confidence: 99%

Numerical Investigation of Flow Patterns in Rectangular Shallow Reservoirs

Dufresne

Dewals

Erpicum

et al. 2011

Engineering Applications of Computational Fluid Mechanics

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“…assuming a plug flow); and therefore a detailed knowledge of the flow field developing in the reservoir is needed. It has been shown that this flow field is strongly influenced by the shape of the reservoir (Dufresne, Dewals, Erpicum, Archambeau, & Pirotton, 2010a;Kantoush, Bollaert, & Schleiss, 2008), the bottom roughness (Choufi, Kettab, & Schleiss, 2014) and the sediment load (Camnasio et al, 2013). In this study we focus on reservoirs with a relatively smooth bottom roughness without sediment loads.…”

Section: Introductionmentioning

confidence: 99%

Maximum energy dissipation to explain velocity fields in shallow reservoirs

Westhoff

Erpicum

Archambeau

et al. 2017

Journal of Hydraulic Research

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Shallow reservoirs are often used as sediment traps or storage basins, in which sedimentation depends on the flow pattern. Short rectangular reservoirs reveal a straight jet from inlet to outlet with identical recirculation zones on both sides. In longer reservoirs, the main jet reattaches to the side of the reservoir leading to small and large recirculation zones. Previous studies have found an empirical geometric relation describing the switch between these two flow patterns. In this study, we demonstrate, with a simple analytical model, that this switch coincides with a maximization of energy dissipation in the shear layer between the main jet and recirculation zones: short reservoirs dissipate more energy when the flow pattern is symmetric, while longer reservoirs dissipate more energy with an asymmetric pattern. This approach enables the prediction of the flow patterns without detailed knowledge of small scale processes, potentially useful in the early phase of reservoir design.

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“…The reviewed studies for sedimentation in shallow ponds involved experimental modeling in laboratory scale ponds, where the impact of environmental factors is minimal (Kantoush et al, 2008;Dufresne et al, 2010;Camnasio et al, 2013). The numerical model studies such as that of (Alvarado et al, 2012a;Ouedraogo et al, 2016;Coggins et al, 2017) looked at the impact of sludge accumulations in pond hydraulics, without accounting much for what influences the sludge accumulations.…”

Section: Introductionmentioning

confidence: 99%