A new look to the applicability of classical models for ripple prediction
Delgado Blanco, M.R.; Bell, P.; Monbaliu, J. (2005). A new look to the applicability of classical models for ripple prediction, in: McKee Smith, J. (Ed.) Proceedings of the 29th International Conference: Coastal Engineering 2004. pp. 1909-1921
In: McKee Smith, J. (Ed.) (2005). Proceedings of the 29th International Conference: Coastal Engineering 2004. World Scientific Publishing: Singapore. ISBN 981-256-298-2. 4 vol. pp., meer
Recent comparisons between different sand transport models (Davies et al., 2002) point out, once more, a need for in depth investigation of physical processes under rippled bed conditions. Ripple dimensions and evolution control the magnitude of bed shear stresses, nearbed flow structure and suspended sediment distribution along the water column. Therefore it is a key element in coastal dynamics and the performance of sediment transport models largely depends on the accuracy of the implemented roughness model. One of the constraints to the improvement of the available bed roughness models is the lack of full scale measurements. Field data acquisition is expensive and still limited by instrument performance. Most often ripple predictors have been obtained from scaled models where interactions between sandy bed and waves cannot be reproduced in a fully realistic manner. In 2001 full scale experiments were performed in the Deltaflume (Delft Hydraulics, NL). Bed profiles were measured for different irregular wave conditions ranging between 0.3 and 1.6 m Hs and a constant Tp of 6 s. As alternative to empirical models the suitability of a probabilistic approach to model ripple geometry for different wave conditions will be introduced.
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