Dam-break waves over an erodible embankment: experiments and simulations

Cristo, Cristiana Di; Evangelista, Stefania; Greco, Massimo; Iervolino, Michele; Leopardi, Angelo; Vacca, Andrea

doi:10.1080/00221686.2017.1313322

Cited by 42 publications

(16 citation statements)

References 36 publications

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“…Aureli et al [12] experimentally investigated the impact of dam-break wave on a structure. Di Cristo et al [13] performed a few experiments of dam-break wave over an erodible embankment.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Shock Wave Propagation Due to Dam-Break Over a Wet Channel

Turhan¹,

Özmen-Çağatay²,

Kocaman³

2019

Pol. J. Environ. Stud.

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We investigated the propagation of shock waves in a prismatic rectangular channel with a horizontal wet bed. Saltwater was used as a Newtonian fluid within the entire channel instead of normal water for representing the different density fluids. It aims to point out seawater where tsunamis occur as an extreme example of shock waves. The shock waves were generated by sudden lifting of a vertical gate that separated a reservoir and a downstream channel with three different tailwater depths. The experimental data were digitized using image processing techniques. Furthermore, the flow was numerically solved by using Reynolds Averaged Navier-Stokes (RANS) equations and a DualSPHysics program (a code version of smoothed particle hydrodynamics (SPH)). After sudden removal of the vertical gate the propagations of shock waves were experimentally examined via image processing, which can yield both free surface profiles at several times and variations of flow depth with time at four specified locations. Solution successes of two different numerical methods for this rapidly varied unsteady flow are tested by comparing the laboratory data. The results indicate that the disagreements on graphs of time evolutions of water levels obtained from two numerical simulations decrease when the initial tailwater levels increase.

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“…Aureli et al [12] experimentally investigated the impact of dam-break wave on a structure. Di Cristo et al [13] performed a few experiments of dam-break wave over an erodible embankment.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Shock Wave Propagation Due to Dam-Break Over a Wet Channel

Turhan¹,

Özmen-Çağatay²,

Kocaman³

2019

Pol. J. Environ. Stud.

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“…Better results can be obtained by RANS with turbulence closures, but requiring more computational effort for the 3D dam-break flow, whereas the SWEs-based numerical models need less computing power and shorter computational time in large-scale problems with reasonable accuracy. If the flow, in fact, is truly 3D just upstream of the contraction, then it can be assumed to be 2D except at the converging part of the obstacle and for the initial stage of the dam break; therefore the SWE approach can be accepted overall for the reasonable prediction of the dam-break flow [31,53,54].…”

Section: Comparison Between Experimental and Numerical Results For Trmentioning

confidence: 99%

Experimental and Numerical Analysis of a Dam-Break Flow through Different Contraction Geometries of the Channel

Kocaman

Güzel

Evangelista

et al. 2020

Water

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Dam-break wave propagation usually occurs over irregular topography, due for example to natural contraction-expansion of the river bed and to the presence of natural or artificial obstacles. Due to limited available dam-break real-case data, laboratory and numerical modeling studies are significant for understanding this type of complex flow problems. To contribute to the related field, a dam-break flow over a channel with a contracting reach was investigated experimentally and numerically. Laboratory tests were carried out in a smooth rectangular channel with a horizontal dry bed for three different lateral contraction geometries. A non-intrusive digital imaging technique was utilized to analyze the dam-break wave propagation. Free surface profiles and time variation of water levels in selected sections were obtained directly from three synchronized CCD video camera records through a virtual wave probe. The experimental results were compared against the numerical solution of VOF (Volume of Fluid)-based Shallow Water Equations (SWEs) and Reynolds-Averaged Navier-Stokes (RANS) equations with the k-ε turbulence model. Good agreements were obtained between computed and measured results. However, the RANS solution shows a better correspondence with the experimental results compared with the SWEs one. The presented new experimental data can be used to validate numerical models for the simulation of dam-break flows over irregular topography.Water 2020, 12, 1124 2 of 22 to limited available dam-break real-case data [5,6], laboratory and numerical modeling studies are significant for understanding this type of complex flow problems [7][8][9].The analysis of the literature shows several laboratory experiments aimed at investigating the propagation of a dam-break flow over irregular flumes [2,3,[10][11][12][13][14][15][16]. The galloping progresses in the evolution of the imaging technology have led to a wiser use of the digital image processing in laboratory experimental measurements of dam-break flows [17][18][19][20], with significant contribution to better understand the physics of real processes [21,22].Investigation of dam-break flows over complex topography can be performed through numerical analysis and validated through the comparison of numerical solutions obtained with different methods against experimental data [23][24][25][26][27][28]. Most of previous works simulated the dam-break flow through the Shallow Water Equations (SWEs) [2,[29][30][31][32]. The complete 3D Reynolds-Averaged Navier-Stokes (RANS) equations involving the turbulence modeling can more accurately describe the dam-break wave propagation over complex topography [27,28,33,34]. Recently, 3D VOF (Volume of Fluid) based CFD (Computational Fluid Dynamics) modeling software, such as FLOW-3D (Flow-Science Co, New Mexico, NM, USA) have been widely applied to the simulation of unsteady free-surface flows and also tested on dam-break flows [35][36][37][38][39][40].The present research focuses on the dam-break flood wave propagation over the downstream ...

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“…In order to validate the ability of the present model to deal with dam-break flow over movable bed, an experiment of dam-break flow in an erodible channel with a sudden enlargement conducted in the laboratory of Université catholique de Louvain (UCL) in Belgium [48,49] , which had been used by many researchers [14,[17][18][19]22,27] to test their models, is simulated here. As shown in Figure 9, the experimental flume is 6 m long with a sudden enlargement of width from 0.25 m to 0.5 m at 4 m downstream of the inlet.…”

Section: Dam-break Flow In An Erodible Channel With a Sudden Enlargementmentioning

confidence: 99%

“…In recent years, some numerical models have been proposed in the literature to simulate dam break flows on movable beds [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In order to improve the accuracy of simulating dam-break flow-induced sediment transport, the numerical models are evolving from equilibrium description to non-equilibrium description of sediment transport [21,22]. Equilibrium sediment transport models based on the assumption that the bed load or the total load are instantaneously adapted to equilibrium state have been widely used for morphodynamic problems [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A Non-Equilibrium Sediment Transport Model for Dam Break Flow over Moveable Bed Based on Non-Uniform Rectangular Mesh

Yang

Zhang

et al. 2018

Water

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The use of multiple-level non-uniform rectangular mesh in coupled flow and sediment transport modeling is preferred to achieve high accuracy in important region without increasing computational cost greatly. Here, a robust coupled hydrodynamic and non-equilibrium sediment transport model is developed on non-uniform rectangular mesh to simulate dam break flow over movable beds. The enhanced shallow water and sediment transport equations are adopted to consider the mass and momentum exchange between the flow phase and sediment phase. The flux at the interface is calculated by the positivity preserving central upwind scheme, which belongs to Godunov-type Riemann-problem-solver-free central schemes and is less expensive than other popular Riemann solvers while still capable of tracking wet/dry fronts accurately. The nonnegative water depth reconstruction method is used to achieve second-order accuracy in space. The model was first verified against two laboratory experiments of dam break flow over irregular fixed bed. Then the quantitative performance of the model was further investigated by comparing the computational results with measurement data of dam break flow over movable bed. The good agreements between the measurements and the numerical simulations are found for the flow depth, velocity and bed changes.

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Dam-break waves over an erodible embankment: experiments and simulations

Cited by 42 publications

References 36 publications

Experimental and Numerical Investigation of Shock Wave Propagation Due to Dam-Break Over a Wet Channel

Experimental and Numerical Investigation of Shock Wave Propagation Due to Dam-Break Over a Wet Channel

Experimental and Numerical Analysis of a Dam-Break Flow through Different Contraction Geometries of the Channel

A Non-Equilibrium Sediment Transport Model for Dam Break Flow over Moveable Bed Based on Non-Uniform Rectangular Mesh

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