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Sediment transport rates over bedforms: observations and model predictions
Powell, H.J.; Voulgaris, G.; Collins, M.B.; Bastos, A.C. (2000). Sediment transport rates 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., meer
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Documenttype: Congresbijdrage
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  • Powell, H.J.
  • Voulgaris, G.
  • Collins, M.B.
  • Bastos, A.C.
Abstract
    Hydrodynamic data and sea bed observations were collected from an autonomous multi-sensor tripod (STABLE) in the vicinity of the Broken Bank, off the Norfolk coast, UK. The performance of 10 existing predictive sediment transport formulae are compared against sediment transport rates inferred from observed ripple migration rates. A refined bottom roughness model proposed by Powell et al. (in this volume) is adopted here: Log (k5) = 4.09 èta cos thètaalpha - 3.42Wide variation between the sediment transport rate results is evident. A recalibrated formula is suggested, similar to those proposed by Soulsby (1993), Williams et al. (1989) and Hardisty (1983).Lb = Bg(1 - rho/ rho5)(taub - taucr)U100 This formula offers considerable improvement over those proposed previously.
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