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Experimental observation and modelling of roughness variation due to supply-limited sediment transport in uni-directional flow / Arjan P. Tuijnder in Journal of hydraulic research, Vol. 50 N° 5 (Septembre/Octobre 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 5 (Septembre/Octobre 2012) . - pp. 506-520 Titre : Experimental observation and modelling of roughness variation due to supply-limited sediment transport in uni-directional flow Type de document : texte imprimé Auteurs : Arjan P. Tuijnder, Auteur ; Jan S. Ribberink, Auteur Année de publication : 2012 Article en page(s) : pp. 506-520 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bedform  dimensions  Immobile  layer  Riverbed  roughness  Sand  gravel  mixture  Ssupply  limitation Résumé : This paper presents a study on the relationship between supply-limited bedform formation and the hydraulic roughness of the riverbed. The results of several new sets of flume experiments with supply-limited or partial transport conditions with bimodal sediment are presented. The results show that both the bedform and grain-related roughness show a clear dependency on the degree of supply limitation. This variation can be attributed to the reduction of the bedform dimensions with a decreasing availability of mobile sediment and an increasing exposure of the usually coarser sublayer (armour layer or pavement) that causes the supply limitation. In the present study, we present a new method to predict the exposure of the immobile sublayer, as well as the bedform and grain-related roughness under supply-limited conditions. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.719201 [article] Experimental observation and modelling of roughness variation due to supply-limited sediment transport in uni-directional flow [texte imprimé] / Arjan P. Tuijnder, Auteur ; Jan S. Ribberink, Auteur . - 2012 . - pp. 506-520. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 5 (Septembre/Octobre 2012) . - pp. 506-520 Mots-clés : Bedform  dimensions  Immobile  layer  Riverbed  roughness  Sand  gravel  mixture  Ssupply  limitation Résumé : This paper presents a study on the relationship between supply-limited bedform formation and the hydraulic roughness of the riverbed. The results of several new sets of flume experiments with supply-limited or partial transport conditions with bimodal sediment are presented. The results show that both the bedform and grain-related roughness show a clear dependency on the degree of supply limitation. This variation can be attributed to the reduction of the bedform dimensions with a decreasing availability of mobile sediment and an increasing exposure of the usually coarser sublayer (armour layer or pavement) that causes the supply limitation. In the present study, we present a new method to predict the exposure of the immobile sublayer, as well as the bedform and grain-related roughness under supply-limited conditions. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.719201