New experiments with graded sand were conducted in the large oscillating tunnel of Delft Hydraulics. The measured transport rates show that size gradation of sand particles has a small effect on the total net transport rates. However, the transport rates of individual grain-size fractions are strongly affected due to the interactions between the sizes. Finer sizes in the mixture are less transported as part of a mixture than as `uniform' material. Moreover, the transported sand mixture is coarser than the original sand bed. Comparing the new experimental results with three different transport models show that using the hiding/exposure correction factor of Day with the model of Ribberink leads to better predictions for the composition of the transported sand. The model of Dibajnia & Watanabe overestimates the transport rates of the two fractions under investigation. The model of Bailard overestimates the transport rates and the contribution of the fine fraction in the transported sand.
Size-Gradation Effect on Sand Transport Rates under Oscillatory Sheet-Flows
Fourth Conference on Coastal Dynamics ; 2001 ; Lund, Sweden
Coastal Dynamics '01 ; 928-937
2001-05-18
Conference paper
Electronic Resource
English
Sediment Transport in Oscillatory Sheet Flow
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