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Modelling wave damping by fluid mud : derivation of a dispersion equation and an energy dissipation term and implementation into SWAN
Publication type | dissertatie
This study presents modelling of wave damping by fluid mud. To compute wave damping for situations in practice, the influence of mud is incorporated in the wave model SWAN. First, an energy dissipation term is derived that represents the mud-induced dissipation. The derivation is based on the used viscous two-layer model and consistent with the dispersion equation. This term is added as a sink term to the energy balance in SWAN. By making the mud-adjusted wave number available through the whole code, also influence of fluid mud on energy propagation is included in the model. The performance of the model for both energy dissipation and energy propagation is validated for some simple cases. The final result of this study is a modified version of SWAN which allows to model the decrease of energy during the propagation of a wave field over fluid mud.