The effect of bottom friction dissipation and of the different formulations used for this term on hte wave evolution has been investigated in the Belgian coastal regions.Two eddy viscosity models for the bottom friction dissipation,the madsen et al.(1998) model and Weber's (1991a) model have been implemented in the Cycle 4 version of the third generation WAM model (Gunther et al.,1992).the wave conditions for the area of the southern North Sea were hindcasted for the February 1993 storm.the resultis are ocmpaed with buoy data.It is found that the net effect of bottom friction dissipation on the significant wave height hindcast is quite big,in the order of 80
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