Wave height transformation and wave setup (\autoref{fig:Deltaflume2006_T01_default_fig1.eps}) are favourably reproduced with the model. The long wave height is slightly underestimated whereas the wave setup is slightly overestimated. The correlation between measured short wave variance and long wave water surface elevations (\autoref{fig:Deltaflume2006_T01_default_fig2.eps}) corresponds reasonably well with the measurements. Towards the shoreline this correlation increases (Abdelrahman and Thornton, 1987; Roelvink and Stive, 1989) meaning the highest short waves travel on top of long waves, which likely causes that more short wave energy gets closer to the dune face. 
Short wave skewness and asymmetry are reasonably predicted with the extended Rienecker Fenton model (\autoref{fig:Deltaflume2006_T01_default_fig3.eps}). However, in the inner surf zone both wave skewness and asymmetry are overestimated. Possible explanations are wave breaking, which limits the steepness and height of waves and the presence of free harmonics in the flume. Both these effects are not included in the wave shape model but indeed are present in the flume test (see Van Thiel de Vries, 2009). From simulated skewness and asymmetry it follows that the total nonlinearity of a short wave is overestimated close to the dune face (\autoref{fig:Deltaflume2006_T01_default_fig4.eps}). The phase Beta is favourably simulated with the model but is underestimated further offshore.