TOMAWAC

• wind
• wave
• energy
• level
• per frequency
• per direction
• Hm0
• Tm02
• wave force

Equations: conservation of action density N(t,x,y,kx,ky)

• generation by wind
• dissipation by depth-induced wave breaking
• dissipation by bottom friction
• dissipation by white capping
• Non-linear wave-wave interaction (quadruplet and triad (shallow waters))
• Refraction (by bottom and current gradient)
• Blocking (by opposing current)
• Blocking and transmission (due to obstacles and vegetation)
• Wave-current interaction

default in physical and spectral space

• fully absorbing for leaving wave energy

in open boundaries

• the boundary spectrum is specified by the incoming wave energy

shape of spectrum at the boundary of the computational grid could be:

• JONSWAP spectrum,
• simulated results provided by external model predictions (nested TOMAWAC) (KUL)

For model set-up:

• Bathymetry
• Wind
• E.g. ERA-interim (at KUL)
• Measured wind (at KUL)

For B.C.:

• Nesting on coarse TOMAWAC run

Model generated data:

• Wave energy spectra
• Integrated wave parameters Hm0, Tm02, …

Cartesian/Spherical

• Not very well documented (manuals and within the code)
• Under continuous improvement (multiple bugs have been reported and solved in the last year)

Comparison

• Parametric (integrated spectral parameters, Hm0, Tm02)
• Spectral (spectral score)

Calibration tools

• Sources (wind generation coef.)
• Sinks (bottom roughness, …)
• Numerical (dt, conv. crit., …)
• Discretization (dx, dy, df, dθ, …)

Parametric Comparison (Hm0, Tm02)

• Multiple measurement stations in southern North Sea
• Shallowest at ~5 m. MSL at Trapegeer

Spectral comparison (1D or 2D)

• Directional (f-θ) and non-directional (freq. only) buoys