<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>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.</p>
</abstract>

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.

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

Department of Geography, School of Social Sciences, History, and Philosophy

Department of Water Science and Engineering, Faculty of Agriculture

Department of Civil, Environmental, Architectural Engineering and Mathematics

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

This study aimed to comprehensively investigate the influence of substrate level difference and material composition on dam break wave evolution over two...

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

Publicado en línea: 08 feb 2024

Páginas: 80 - 94

Recibido: 14 ago 2023

Aceptado: 20 nov 2023

DOI: https://doi.org/10.2478/johh-2023-0040

Palabras clave
Dam break, Substrate level difference, Erodible bed, Sediment transport, Computational fluid dynamics CFD

© 2023 Alireza Khoshkonesh et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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

Publicado en línea: 08 feb 2024

Páginas: 80 - 94

Recibido: 14 ago 2023

Aceptado: 20 nov 2023

DOI: https://doi.org/10.2478/johh-2023-0040

Palabras claveDam break, Substrate level difference, Erodible bed, Sediment transport, Computational fluid dynamics CFD

© 2023 Alireza Khoshkonesh et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Palabras clave
Dam break, Substrate level difference, Erodible bed, Sediment transport, Computational fluid dynamics CFD