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Nonlinear random wave-induced drag force on a vegetation field
Authors:Dag Myrhaug  Lars Erik HolmedalMuk Chen Ong
Affiliation:Department of Marine Technology, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
Abstract:This paper provides a practical method by which the drag force on a vegetation field beneath nonlinear random waves can be estimated. This is achieved by using a simple drag formula together with an empirical drag coefficient given by Mendez et al. (Mendez, F.J., Losada, I.J., Losada, M.A., 1999. Hydrodynamics induced by wind waves in a vegetation field. J. Geophys. Res. 104 (C8), 18383–18396). Effects of nonlinear waves are included by using Stokes second order wave theory where the basic harmonic motion is assumed to be a stationary Gaussian narrow–band random process. An example of calculation is also presented.
Keywords:Vegetation field   Drag force   Nonlinear random waves   Stochastic method
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