Dam-break flows over mobile beds: experiments and benchmark tests for numerical models

Frazao, Sandra Soares; Canelas, Ricardo B.; Cao, Zhixian; Cea, Luís; Chaudhry, Hanif M.; Morán, Andrés Die; Kadi, K. El; Ferreira, Renata Marques; Fraga, Ignacio; Gonzalez-Ramirez, Noemi; Greco, Massimo; Huang, Wei; Imran, Jasim; Coz, Jérôme Le; Marsooli, Reza; Paquier, André; Pender, Gareth; Pontillo, Marianeve; Puertas, Jerónimo; Spinewine, Benoît; Swartenbroekx, Catherine; Tsubaki, Ryota; Villaret, Catherine; Wu, Weiming; Yue, Zhiyuan; Zech, Yves

doi:10.1080/00221686.2012.689682

Cited by 100 publications

(55 citation statements)

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“…It is recognized that environmental flows may induce active sediment transport and morphological evolution, which in turn modify the flows. One of the most telling cases is dam-break flow over an erodible sediment bed [14][15][16]. To date, however, most studies using AMR have been limited to cases either without involving sediment transport at all [4, [9][10][11]13,17] or featuring the assumption of sediment transport capacity, which is not normally justified.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that deviations of the computed water lev-els and bed profiles from the measured ones are in a similar magnitude to the discrepancies of water levels and bed profiles among different experiment runs (see Figures 4 and 5 and the related text in ref. [16]). Figure 10 shows the computed and measured bed topographies at t =20 s. In the local area near the expanded corner, bed evolution is difficult to accurately model even in a qualitative sense (Figure 10 in ref.…”

Section: Dam Break Flow Over Mobile Bedmentioning

confidence: 99%

“…A 2D mobile-bed dam-break experiment was performed at UCL-Belgium to investigate the hydrodynamics and morphological evolution [16]. The flume was 3.6 m wide and about 36 m long (Figure 7).…”

Section: Dam Break Flow Over Mobile Bedmentioning

confidence: 99%

See 2 more Smart Citations

Coupled flood and sediment transport modelling with adaptive mesh refinement

Huang

Cao

Pender

et al. 2015

Sci. China Technol. Sci.

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Coupled flood and sediment transport modelling in large-scale domains has for long been hindered by the high computational cost. Adaptive mesh refinement is one of the viable ways to solving this problem without degrading the accuracy. This goal can be accomplished through mesh adaptation, e.g., mesh coarsening and refining based on the dynamic regime of the flow and sediment transport along with bed evolution. However, previous studies in this regard have been limited to cases either without involving sediment transport or featuring flow-sediment-bed decoupling and the assumption of sediment transport capacity, which are not generally justified. Here, a coupled hydrodynamic and non-capacity sediment transport model is developed on adaptive non-uniform rectangular mesh. The proposed model is validated against experimental tests and numerical results based on the fixed meshes. It is demonstrated that the proposed model can properly capture shock waves, resolve the wetting/drying transition and reproduce morphological evolution. Compared with models based on the fixed meshes, the proposed model features great advantage in computational efficiency and holds promise for wide applications.shallow water flow, sediment transport, adaptive mesh Citation:Huang W, Cao Z X, Pender G, et al. Coupled flood and sediment transport modelling with adaptive mesh refinement.

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Section: Introductionmentioning

confidence: 99%

Section: Dam Break Flow Over Mobile Bedmentioning

confidence: 99%

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Coupled flood and sediment transport modelling with adaptive mesh refinement

Huang

Cao

Pender

et al. 2015

Sci. China Technol. Sci.

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“…It is a freely distributed numerical model for simulating turbulent free surface unsteady flow. It has been successfully used for a wide range of applications, including modeling of river flow and quality [39][40][41], geomorphic impacts of dam failure [12], sedimentation and flushing in reservoirs [42] or check dam hydraulics [43]. For a detailed description of model equations and numerical methods, the reader is referred to [26] and the references therein.…”

Section: Hydraulic Model Descriptionmentioning

confidence: 99%

Two-Dimensional Dam-Break Flood Analysis in Data-Scarce Regions: The Case Study of Chipembe Dam, Mozambique

Álvarez

Puertas

Peña

et al. 2017

Water

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This paper presents the results of a modeling study of the hypothetical dam break of Chipembe dam in Mozambique. The modeling approach is based on the software Iber, a freely available dam break and two-dimensional finite volume shallow water model. The shuttle radar topography mission (SRTM) online digital elevation model (DEM) is used as main source of topographic data. Two different DEMs are considered as input for the hydraulic model: a DEM based on the original SRTM data and a hydrologically-conditioned DEM. A sensitivity analysis on the Manning roughness coefficient is performed. The results demonstrate the relevant impact of the DEM used on the predicted flood wave propagation, and a lower influence of the roughness value. The low cost modeling approach proposed in this paper can be an attractive option for modeling exceptional flood caused by dam break, when limited data and resources are available, as in the presented case. The resulting flood-inundation and hazard maps will enable the Regional Water Management Administration of Mozambique (ARA) to develop early warning systems.

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“…Among other, cases of dam-break flow over mobile bed with a sudden enlargement of the valley (e.g. Goutière et al 2011or Soares-Frazão et al 2012) take advantage of the possibility to compute distinct sediment and water velocity directions.…”

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confidence: 99%

Modelling of fast hydraulic transients: issues, challenges, perspectives

2015

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ABSTRACT. -The paper proposes an overview of different modelling approaches used for severe transients, particularly dam-break waves. One-, two-and three-dimensional approaches are briefly recalled with some examples in order to highlight their strengths and weaknesses, especially regarding the accurate speed of information through the numerical schemes. Two examples are developed with more details in order to highlight the result sensitivity to the selected model: the classical circular dam break and its dependency on the mesh, and the behaviour of the dam-break flow in a 90° bend. Experimental data are also presented in order to show that, even in the near-field, hydrostatic pressure assumption has a limited impact on the accuracy. Some results from Smoothed Particle Hydrodynamics are also compared to common Eulerian approaches. In order to use the best of each approach, hybrid methods are also considered through the example of the 90° bend. Fast transients generally induce erosion and deposition of large amounts of sediment. The challenge is now to account for the inertia of the sediments suddenly mobilised. A two-layer model is proposed, with some assumptions, not wholly in line with experimental observations, but with promising results. Several improvements are tested but closure equations remain delicate and require more fundamental investigations.Key-words: Dam-break, hybrid approaches, sheet flow, two-layer approach Modélisation des transitoires hydrauliques sévères : enjeux, défis, perspectivesRÉSUMÉ. -Le papier propose un survol de différentes approches utilisées pour modéliser des transitoires sévères, en particulier l'onde de rupture de barrage ou de digue. Les principes des approches uni-, bi-ou tridimensionnelles sont rappelés avec leurs forces et leurs faiblesses, spécialement concernant la célérité de l'information au sein du schéma numérique. Deux exemples sont développés pour illustrer la sensibilité des résultats au choix du modèle : la rupture d'un barrage circulaire et l'onde de rupture dans un coude à 90°. Des mesures expérimentales sont aussi présentées pour montrer l'impact limité de l'hypothèse de distribution hydrostatique de pression. En vue de tirer bénéfice des avantages de chaque approche, des méthodes hybrides sont illustrées à travers l'exemple du coude à 90°. Les transitoires sévères induisent généralement une grande quantité d'érosion et de dépôt. Dans ce cas, l'enjeu est de tenir compte de l'inertie des sentiments brusquement mobilisés. Un modèle à deux couches est proposé, avec des hypothèses non parfaitement conformes aux observations, mais avec des résultats prometteurs. De récentes pistes d'améliora-tion ont été testées mais les équations de fermeture demeurent délicates.

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Dam-break flows over mobile beds: experiments and benchmark tests for numerical models

Cited by 100 publications

References 15 publications

Coupled flood and sediment transport modelling with adaptive mesh refinement

Coupled flood and sediment transport modelling with adaptive mesh refinement

Two-Dimensional Dam-Break Flood Analysis in Data-Scarce Regions: The Case Study of Chipembe Dam, Mozambique

Modelling of fast hydraulic transients: issues, challenges, perspectives

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