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