A two-phase model for fast geomorphic shallow flows

Greco, Massimo; Iervolino, Michele; Leopardi, Angelo; Vacca, Andrea

doi:10.1016/s1001-6279(13)60001-3

Cited by 60 publications

(29 citation statements)

References 55 publications

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“…The results of the laboratory experimental campaign have been utilized to validate the capability of a numerical model by Greco et al [28] (see also [34,35]) of predicting the physical evidence. The above-described experiments have been reproduced numerically, in order to check if the model could be hereafter reliable for analyzing a greater number of scenarios.…”

Section: Methodsmentioning

confidence: 99%

“…The aim of the present work is, instead, to investigate a significantly different condition, in which the impact of a sudden wave provokes the dike overtopping. The consequent erosion process, in fact, is certainly affected by the fact that the overtopping does not occur in steady conditions, but rather, in strongly unsteady ones [28]. The pursued objective is to provide a contribution to understanding the evolution of the wave overtopping and consequent dike erosion processes, with a new view toward dynamic waves.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental data have been also used to test the predictive capability of a numerical code based on a morphodynamic depth-integrated two-phase approach [28] and here adopted for the simulations. The model neglects cohesion, suspended load sediment transport and seepage effects, but it is still capable of catching some features of the physical evidence and, thus, offering some indications for prediction and practical use.…”

Section: Introductionmentioning

confidence: 99%

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Experiments and Numerical Simulations of Dike Erosion due to a Wave Impact

Evangelista

2015

Water

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Dike erosion is a crucial issue in coastal and fluvial flood risk management. These defense structures appear vulnerable to extreme hydrological events, whose potential occurrence risk seems to be recently increased due to climate change. Their design and reinforcement is, however, a complex task, and although numerical models are very powerful nowadays, real processes cannot be accurately predicted; therefore, physical models constitute a useful tool to investigate different features under controlled conditions. This paper presents some laboratory experimental results of erosion of a sand dike produced by the impact of a dam break wave. Experiments have been conducted in the Water Engineering Laboratory at the University of Cassino and Southern Lazio, Italy, in a rectangular channel: here, the sudden opening of a gate forming the reservoir generates the wave impacting the dike, made in turn of two different, almost uniform sands. The physical evidence proves that the erosion process is strongly unsteady and significantly different from a gradual overtopping and highlights the importance of apparent cohesion for the fine sand dike. The experimental results have also been compared against the ones obtained through the numerical integration of a two-phase model, which shows the reasonable predictive capability of the temporal free surface and dike profile evolution.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experiments and Numerical Simulations of Dike Erosion due to a Wave Impact

Evangelista

2015

Water

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“…Different fluid mechanic models have been proposed for studying these flows, either based on two-phase approaches (Greco et al, 2012;Iverson, 1997;Jackson, 2000;Pitman and Le, 2005) or on a single-phase description of the flow rheology. Within the latter category, which will be considered herein, the literature offers several formulations: linear and non-linear viscoplastic models Garcia, 1997, 1998;Johnson, 1970;Liu and Mei, 1989;O'Brien and Julien, 1988), dilatant fluid models (Bagnold, 1954;Mainali and Rajaratnam, 1994;Takahashi, 1978) biviscous modified Bingham models (Dent and Lang, 1983).…”

Section: Introductionmentioning

confidence: 99%

On the applicability of minimum channel length criterion for roll-waves in mud-flows

Cristo¹,

Iervolino²,

Vacca³

2013

Journal of Hydrology and Hydromechanics

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Abstract:The paper addresses the prediction of roll-waves occurrence in mud-flows. The spatial growth of a point-wise disturbance is analytically described, based on the linearized flow model of a Herschel and Bulkley fluid, in the neighborhood of an initial uniform base condition. The theoretical achievements allow to generalize to mud-flows the minimum channel criterion commonly used for the prediction of roll-waves in clear-water. The applicability of the criterion is discussed through the comparison with literature laboratory data concerning unstable flows without rollwaves.

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“…Capart and Young, 2002;Li et al, 2013;Savary and Zech, 2007;Swartenbroekx et al, 2010) or multi-phase (e.g. Evangelista et al, 2013a;Garegnani et al, 2011;Greco et al, 2012;Rosatti and Begnudelli, 2013) models have been proposed, which account for the mass and momentum conservation for both water and sediments (Evangelista et al, 2015c). The increased complexity of the morphodynamic models is rewarded by the possibility to better reproduce fast geomorphic transients.…”

Section: Introductionmentioning

confidence: 99%

A multi-parameter calibration method for the numerical simulation of morphodynamic problems

Evangelista

Giovinco

Kocaman

2017

Journal of Hydrology and Hydromechanics

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Calibration of parameters of mathematical models is still a tough task in several engineering problems. Many of the models adopted for the numerical simulations of real phenomena, in fact, are of empirical derivation. Therefore, they include parameters which have to be calibrated in order to correctly reproduce the physical evidence. Thus, the success of a numerical model application depends on the quality of the performed calibration, which can be of great complexity, especially if the number of parameters is higher than one. Calibration is traditionally performed by engineers and researchers through manual trial-and-error procedures. However, since models themselves are increasingly sophisticated, it seems more proper to look at more advanced calibration procedures. In this work, in particular, an optimization technique for a multi-parameter calibration is applied to a two-phase depth-averaged model, already adopted in previous works to simulate morphodynamic processes, such as, for example, the dike erosion by overtopping.

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A two-phase model for fast geomorphic shallow flows

Cited by 60 publications

References 55 publications

Experiments and Numerical Simulations of Dike Erosion due to a Wave Impact

Experiments and Numerical Simulations of Dike Erosion due to a Wave Impact

On the applicability of minimum channel length criterion for roll-waves in mud-flows

A multi-parameter calibration method for the numerical simulation of morphodynamic problems

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