for in the model. Wave setup is the superelevation of the water surface over 

 normal swl elevations and is due to wave breaking which causes radiation 

 stresses to develop. Seiche is a long-period oscillation which can occur in 

 an enclosed body of water and, in the case of wave tanks, depends mostly on 

 tank length and geometry, 



30. It was determined that both wave setup and seiche existed in vary- 

 ing degrees during the Virginia Beach tests. Measured values of wave setup 

 and calculated values of the seiche are reported in the tabulated data (Appen- 

 dix A) . A detailed discussion of wave setup and seiche effects is given in 

 Appendix C. The effects of wave setup were directly accounted for in the 

 model and thus were considered in any subsequent prediction calculations. The 

 main effect of the seiche was that it increased scatter in the data. This was 

 not thought to influence the overall data trend; thus its effect was not in- 

 cluded in the data analysis. 



27 



