U — w 



(b)- 



M(d) 



h(d) 





h(bj-'^ 

 1 



v M(b) 















3 



S> 













= 



2/3 



W(b) =0 



Figure 3. Schematic dune-berm profile, 



(a) with flat berm (b) without flat 



berm (after Kriebel 1984) 



The computational approach is based on the assumption that the onshore- 

 offshore directed transport of sediment in the surf zone is a function of 

 thedissipation of excess wave energy per unit volume according to the 

 relationship 



Q c = K(D-D ea ) 



(2) 



134 



