Non-uniformity and layering in sediment transport modelling 2 / Michael Tritthart in Journal of hydraulic research, Vol. 49 N° 3 (Mai/Juin 2011)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 49 N° 3 (Mai/Juin 2011) . - pp. 335-344 Titre : Non-uniformity and layering in sediment transport modelling 2 : river application Type de document : texte imprimé Auteurs : Michael Tritthart, Auteur ; Marcel Liedermann, Auteur ; Bernhard Schober, Auteur Année de publication : 2011 Article en page(s) : pp. 335-344 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bed-load Danube River Empirical equation Numerical model flow Sediment transport Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The objectives of this research are to verify a numerical sediment transport model based on field data from a reach of the Austrian Danube River, to identify the influence of non-uniform bed-load transport modelling and the selected bed schematization on the simulation results and to investigate the cause and the numerical reproducibility of spatio-temporal variations found in field data. Simulation results based on variants of the transport equation by Meyer-Peter and Müller were compared to basket sampler and radio tracer stone observations. The best agreement was obtained for a non-uniform formulation with an exchange layer, while the uniform formulation of the transport equation underestimated the transport rates for discharges lower than the mean flow since it predicts a later onset of bed-load transport. The consideration of an exchange layer in the numerical code led to the prediction of bed-load sheets due to sorting waves, allowing the model to account for the spatio-temporal variability of field data. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.583487 [article] Non-uniformity and layering in sediment transport modelling 2 : river application [texte imprimé] / Michael Tritthart, Auteur ; Marcel Liedermann, Auteur ; Bernhard Schober, Auteur . - 2011 . - pp. 335-344. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 3 (Mai/Juin 2011) . - pp. 335-344 Mots-clés : Bed-load Danube River Empirical equation Numerical model flow Sediment transport Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The objectives of this research are to verify a numerical sediment transport model based on field data from a reach of the Austrian Danube River, to identify the influence of non-uniform bed-load transport modelling and the selected bed schematization on the simulation results and to investigate the cause and the numerical reproducibility of spatio-temporal variations found in field data. Simulation results based on variants of the transport equation by Meyer-Peter and Müller were compared to basket sampler and radio tracer stone observations. The best agreement was obtained for a non-uniform formulation with an exchange layer, while the uniform formulation of the transport equation underestimated the transport rates for discharges lower than the mean flow since it predicts a later onset of bed-load transport. The consideration of an exchange layer in the numerical code led to the prediction of bed-load sheets due to sorting waves, allowing the model to account for the spatio-temporal variability of field data. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.583487

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