| Titre : | Experimental observation and modelling of roughness variation due to supply-limited sediment transport in uni-directional flow (2012) |
| Auteurs : | Arjan P. Tuijnder, Auteur ; Jan S. Ribberink, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Journal of hydraulic research (Vol. 50 N° 5, Septembre/Octobre 2012) |
| Article en page(s) : | pp. 506-520 |
| Note générale : | Hydraulique |
| Langues : | Anglais |
| Tags : | 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 |
