PREBREAKINGZQNE 



Figure 2. Definition sketch of sand transport zones 



swash zone extends from an arbitrary depth, typically 0.5 m, to the limit of 

 wave runup . 



In the profile change model , the net transport rate in the broken wave 

 zone (Zone III) determines movement of sand over the entire active profile, 

 directly in that zone and indirectly in other zones through matching condi- 

 tions at boundaries. The magnitude of the transport rate in the broken wave 

 zone is governed by energy dissipation per unit volume in excess of an equi- 

 librium energy dissipation as introduced by Moore (1982) and applied by 

 Kriebel (1982, 1986) and others. A second term is included in the present 

 model to represent the effect of beach slope. The magnitude of the transport 

 rate q in the broken wave zone is given by 







e dh 



K (D 



D + 

 eq 



K dx ) 











D > D 



eq 



e dh 

 K dx 



D < above quantity 



(4) 



95 



