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Wave-current interaction over bedforms: observations and model predictions
Powell, H.J.; Voulgaris, G.; Collins, M.B.; Bastos, A.C. (2000). Wave-current interaction over bedforms: observations and model predictions, in: Trentesaux, A. et al. Marine Sandwave Dynamics, International Workshop, March 23-24 2000, University of Lille 1, France. Proceedings.
In: Trentesaux, A.; Garlan, T. (Ed.) (2000). Marine Sandwave Dynamics, International Workshop, March 23-24 2000, University of Lille 1, France. Proceedings. Université de Lille 1: Lille. ISBN 2-11-088263-8. 240 pp., more
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Document type: Conference paper
Keyword
    Marine/Coastal
Authors  Top 
  • Powell, H.J.
  • Voulgaris, G.
  • Collins, M.B.
  • Bastos, A.C.
Abstract
    Hydrodynamic data collected under the combined action of waves and currents are combined with sea bed observations, in order to investigate sea bed roughness and sediment transport. Six bottom roughness models are tested using field data from the southern North Sea. The results indicate that the model of Nielsen (1983) most closely predicts the bottom roughness encountered due to the presence of ripples on a sandy bed. A refined model is proposed that combines the widely-held dependence upon bedform height, and a dependence upon the angle made between the tidal current direction and the bedform crest orientation: log (ks) = 4.09 èta cos theta cr - 3.42
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