Numerical investigation of dam break flow over erodible beds with diverse substrate level variations

This study aimed to comprehensively investigate the influence of substrate level difference and material composition on dam break wave evolution over two different erodible beds. Utilizing the Volume of Fluid (VOF) method, we tracked free surface advection and reproduced wave evolution using experim...

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Bibliographic Details
Published in:	Journal of Hydrology and Hydromechanics Vol. 72; no. 1; pp. 80 - 94
Main Authors:	Khoshkonesh, Alireza, Nsom, Blaise, Okhravi, Saeid, Dehrashid, Fariba Ahmadi, Heidarian, Payam, DiFrancesco, Silvia
Format:	Journal Article
Language:	English
Published:	Bratislava Sciendo 01-03-2024 De Gruyter Poland
Subjects:	Advection Air water interactions Bed load Composition Computational fluid dynamics CFD Dam break Dam failure Entrapment Erodible bed Evolution Finite element method Flow velocity Fluid flow Free surfaces Large eddy simulation Large eddy simulations Parameters Sea surface Sediment load Sediment transport Sensitivity analysis Substrate level difference Substrates Transport equations Turbulence Wave fronts Wave propagation
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Summary:	This study aimed to comprehensively investigate the influence of substrate level difference and material composition on dam break wave evolution over two different erodible beds. Utilizing the Volume of Fluid (VOF) method, we tracked free surface advection and reproduced wave evolution using experimental data from the literature. For model validation, a comprehensive sensitivity analysis encompassed mesh resolution, turbulence simulation methods, and bed load transport equations. The implementation of Large Eddy Simulation (LES), non-equilibrium sediment flux, and van Rijn’s (1984) bed load formula yielded higher accuracy compared to alternative approaches. The findings emphasize the significant effect of substrate level difference and material composition on dam break morphodynamic characteristics. Decreasing substrate level disparity led to reduced flow velocity, wavefront progression, free surface height, substrate erosion, and other pertinent parameters. Initial air entrapment proved substantial at the wavefront, illustrating pronounced air-water interaction along the bottom interface. The Shields parameter experienced a one-third reduction as substrate level difference quadrupled, with the highest near-bed concentration observed at the wavefront. This research provides fresh insights into the complex interplay of factors governing dam break wave propagation and morphological changes, advancing our comprehension of this intricate phenomenon.
ISSN:	1338-4333 0042-790X 1338-4333
DOI:	10.2478/johh-2023-0040