Abstract
Numerical wave propagation models are commonly used as engineering tools for the study of wave transformation in coastal areas. In order to simulate waves in the nearshore zone correctly, the generation and absorption of waves at the boundaries of the models need to be modelled accurately. In numerical models, incident waves are usually generated by prescribing their horizontal velocity component at the boundary of the computational domain over the vertical direction. Additionally, in order to absorb and to prevent re-reflections in front of the numerical wave generator, a weakly reflective wave generation boundary condition is applied in which the total velocity signal is a superposition of the incident velocity signal and a velocity signal of the reflected waves. However, this method is based on the assumption that the reflected waves are small amplitude shallow water waves propagating perpendicular to the boundary of the computational domain and hence this method is weakly reflective for directional and dispersive waves. Within the present study, an internal wave generation method combined with sponge layers is applied in the non-hydrostatic model SWASH, in order to more accurately generate waves and avoid re-reflections at the boundaries.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/5M3aU03XJvI
Highlights
Numerical wave propagation models are commonly used as engineering tools for the study of wave transformation in coastal areas
The governing equations of the model are based on the nonlinear shallow water equations with added non-hydrostatic effects, which are derived from the incompressible Navier-Stokes equations
The implemented internal wave generation method is based on the technique proposed by Wei et al (1999) who developed a source function method in Boussinesq models based on a spatially distributed source
Summary
Numerical wave propagation models are commonly used as engineering tools for the study of wave transformation in coastal areas. NUMERICAL MODEL AND IMPLEMENTATION SWASH is an open source non-hydrostatic wave model (Zijlema et al, 2011).
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