Size-Gradation Effect on Sand Transport Rates under Oscillatory Sheet-Flows

Wael N. Hassan, David F. Kroekenstoel, Jan S. Ribberink

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    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.
    Original languageEnglish
    Title of host publicationCoastal Dynamics '01
    Subtitle of host publicationProceedings of the Fourth Conference on Coastal Dynamics
    EditorsHans Hanson, Magnus Larson
    PublisherAmerican Society of Civil Engineers
    Number of pages10
    ISBN (Print)9780784405666
    Publication statusPublished - 11 Jun 2001
    Event4th ASCE Conference on Coastal Dynamics 2001 - Lund, Sweden
    Duration: 11 Jun 200115 Jun 2001


    Conference4th ASCE Conference on Coastal Dynamics 2001
    Abbreviated titleCoastal Dynamics 2001


    • METIS-125186


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