The simulated test and depth averaged sediment concentration increases towards the shoreline but is underestimated, especially in deeper water where the modelled sediment concentration is smaller (\autoref{fig:Deltaflume2006_T01_default_fig9.eps} and \autoref{fig:Deltaflume2006_T01_default_fig10.eps}). In the proximity of the dune face the simulated mean sediment concentration is within a factor two with the measurements. Further offshore the discrepancy between simulations and measurements is larger. The sharp rise in the near dune sediment concentration compares well with the bore averaged near-bed turbulence intensity (\autoref{fig:Deltaflume2006_T01_default_fig11.eps}) that also increases towards the shoreline. This increase in turbulence intensity through the inner surf is explained by more intensive wave breaking (turbulence production at the water surface increases) and by decreasing water depth (generated turbulence at the water surface is more effective in reaching the bed). 
The simulated time averaged sediment transport compares well with the measured sediment transport computed from profile changes (\autoref{fig:Deltaflume2006_T01_default_fig12.eps}). Sediment is eroded from the dune face via avalanching and as a result the sediment transport associated with avalanching is dominant over the dune face and in the swash zone. From the swash zone seaward, the flow based sediment transport becomes more important. At 205 m from the wave board, in a water depth that varies between 0.1 m and 0.2 m, the flow related sediment transport is dominant.
The simulated flow related sediment transport is separated in sediment transports associated with nonlinear waves (SW), long waves (SL) and the short wave driven under-tow (SR) (\autoref{fig:Deltaflume2006_T01_default_fig13.eps}):
$ S_{W} = u_{A}ch$
$ S_{L} = u^{L}ch$
$ S_{R} = (u^{E}-u^{L})ch$
The offshore sediment transport results from the short wave and roller driven under-tow (SR) combined with the transport associated with the long waves (SL). The transport that follows from the short wave undertow is dominant in the present simu-lation but the long wave related sediment transport cannot be neglected (about 30% at the location of the maximum offshore transport). The wave related sediment transport (SW) is onshore and suppresses the offshore sediment transport with some 30%.
Profile evolution and dune erosion volumes are favourably predicted with the model during test T01 (\autoref{fig:Deltaflume2006_T01_default_fig15.eps} and \autoref{fig:Deltaflume2006_T01_default_fig17.eps}). Between t = 2.04 and 6.0 hours (interval E) the dune erosion rate is slightly underestimated. At the offshore edge of the developing foreshore, the model seems not capable to reproduce the steep transition from the original (unaffected) profile towards the newly developed foreshore. A bar type feature is observed at this transition that is hypothesized to be related to (partly) plunging breakers that generate a water jet, which penetrates in the water column and causes additional sediment stirring when it reaches the bed. Though the effect of wave breaking induced turbulence on sediment suspension is included in the simulation, the applied model only considers spilling breakers, which are expected to be less efficient than plunging breakers in stirring up sand.