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Accurate modelling of orbital velocities near seabed using a nonlinear dispersive wave model
Barlas, B.; Beji, S.; Nadaoka, K. (2000). Accurate modelling of orbital velocities near seabed using a nonlinear dispersive wave model, in: Trentesaux, A. et al. (Ed.) 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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Keyword
    Marine

Authors  Top 
  • Barlas, B.
  • Beji, S.
  • Nadaoka, K.

Abstract
    The recently proposed nonlinear wave model of Nadaoka et. al. (1997) is re-expressed in boundary fitted non-orthogonal curvilinear co-ordinate system for simulating wave motions in domains with irregular boundaries. The co-ordinate transformation converts an irregular physical domain into a rectangular computational domain, which allows for accurate numerical computations using finite-differences approximations. Thus, the boundary conditions for irregular vertical enclosures surrounding a typical physical domain, such as a port or harbour, are satisfied accurately. This improved numerical treatment of the boundaries increase the accuracy of wave model predictions of the velocities inside the domain and on the vertical enclosures, which in turn results in better estimation of wave orbital velocities over the entire water depth. Comparisons of computational results with experimental measurements of horizontal and vertical orbital velocities of nonlinear unidirectional waves propagating over a submarine bar show good agreement and prove the superiority of the new wave model over an improved Boussinesq model. These comparisons are taken to be indicative of the same order of accuracy for orbital velocity predictions of directional wave motions, which are important for sediment transport predictions.

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