Effect of particle density and inflow concentration of suspended sediment on bedload transport in rill flow

Auteur(s) et Affiliation(s)



Description :
Laboratory flume experiments were carried out to evaluate the effect of particle density on bedload transport of sand-sized particles and the effect of a suspended load of clay particles (kaolinite) on bedload transport of sand-sized particles in rill flow conditions. In the two first experiments, two different methods were applied to determine bedload transport capacity of coarse particles for various conditions of flow discharge. In the third experiment, clear water was replaced with kaolinite-water mixture and bedload transport capacity of crushed brick particles was determined for a 4% slope and different concentrations of kaolinite. The results showed that bedload transport increased significantly with the decrease in particle density but the effect of particle density on transport rates was much less important than flow discharge. Velocity measurements of clear flow, flow mixed with coarse particles and coarse particles confirmed the existence of a differentiation between suspended load and bedload. Three transport capacity formulae were tested against observed bedload rates.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2009, vol. 34, n°. 2, p. 253-263, nombre de pages : 11, Références bibliographiques : 1 p.

Date :
2009

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley