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Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/20.500.12222/164
Título : Effect of sediment transport boundary conditions on the numerical modeling of bed morphodynamics
Autor(es) : Alejandro Mendoza, 0000-0002-2479-9799
Autor(es) sin ID: Abad, Jorge D.; Langendoen, Eddy J.; Wang, Dongchen; Tassi, Pablo; El Kadi Abderrezzak, Kamal
Fecha de publicación : 2016
Tipo de resultado Científico: article
Materia o Disciplina: CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA
Palabras clave: River Morphodynamics; Telemac; Hydrodynamic Model; River Numerical Model
Descripción : Experimental sediment transport and river morphologic studies in laboratory flumes can use two sediment-supply methods: an imposed feed at the upstream end, or a recirculation of sediment from the downstream end to the upstream end. These methods generally produce similar equilibrium bed morphology, but temporal evolution can differ. The adjustment of natural rivers may be reproduced by both modes. Nevertheless, computer models of river morphodynamics typically use a sediment-feed boundary condition, which can impact the simulated evolution of transient features such as bedforms. The effect of sediment transport boundary conditions on bedform dynamics was analyzed through numerical experiments using a two-dimensional, depth-averaged sediment transport model. Two different boundary conditions were imposed at the inlet (constant sediment feed and sediment recirculated from the outlet) for two bedform scales (dunes and bars). The type of sediment transport boundary condition greatly influenced dune development. The sediment-recirculating condition produced a more dynamic bed morphology with dunes of higher amplitude. The associated zones of higher shear stress had a direct impact on the hydrodynamics and patterns of sediment transport. In the case of the bar bed morphology, the simulated bars had similar mean length and height for both sediment boundary conditions. However, the sediment-recirculating case produced a more dynamic bed, in which the dominant bar length varied over time. Finally, the simulated bed morphology with bars, agreed much better with that observed when using a calibrated sediment transport equation to match sediment discharges instead of the standard empirical sediment transport equations available in literature.
Editor: American Society of Civil Engineers
URI : http://hdl.handle.net/20.500.12222/164
Condiciones de licencia: https://creativecommons.org/licenses/by/4.0/deed.es
Se autoriza la reproducción total o parcial de los textos aquí publicados siempre y cuando sea sin fines de lucro y se cite la fuente completa y la dirección electrónica de la publicación.
Fuente: Journal of Hydraulic Engineering (4) vol.143 (2016)
ISSN: 0733-9429
Aparece en las colecciones: Artículos Científicos

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