investigated to the same level as the sediment transport rate for the 

 subaqueous profile. We also note that the energetics approach may not be 

 applicable seaward of the wave breaker line. 



63. At present, no theoretical model of beach profile change or dune 

 erosion exists which can be applied for engineering purposes now or in the 

 immediate future. Considerably more theoretical and numerical groundwork 

 must be laid. Little is known about the onshore boundary condition required 

 for such models. In addition, sediment transport rate predictive equations 

 would be best evaluated by comparison to sediment transport rate data and not 

 solely by comparison to the resultant beach profile change. 



32 



