could be accomplished with minimum effort. Therefore, if a more suitable 

 equation becomes available, the change of a subroutine should be sufficient 

 for implementation of the equation. 



Although the model is limited by the omission of the aforementioned 

 parameters, it is reasonably correct. The ability to simulate various 

 physical situations (shore-perpendicular structures, beach fills, breakwater 

 and shore-perpendicular structures) has been demonstrated. In the CIH 

 simulation where the data were first transformed to monotonically decreasing 

 contours and LEO wave data were used, the model still predicts the prototype 

 shoreline changes in a reasonable fashion. 



Further research and model development should include exercising the 

 model in a number of different situations. Several theoretical cases should 

 be simulated, which if analyzed properly, would provide a tool for the 

 coastal engineer. Combined refraction and diffraction should be included, if 

 possible, along with any of the aforementioned parameters which have been 

 omitted and for which relationships exist. Perhaps the most difficult prob- 

 lem to researchers working on modeling sediment transport in the vicinity of 

 structures is the availability of field data. High-quality concurrent wave 

 and bathymetric change data in the vicinity of coastal structures do not 

 exist. One suggested field experiment is to monitor changes both updrift and 

 downdrift of a jettied inlet which has a bypassing plant. Monitoring should 

 begin immediately after bypassing, when the profiles are out of equilibrium. 

 The recorded bathymetric and wave data would then provide data with which to 

 calibrate, verify, and evaluate the existing models. 



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