long. Then shoreline change to the right of S4-S5 is governed solely by wave 

 energy entering through windows E4 and E5. 



165. GENESIS will perform the shoreline calculation for the hypotheti- 

 cal project shown in Figure 16 by separating it into three sand transport 

 domains: the beach from the left boundary to structure S3, the beach between 

 structures S3 and S4-S5, and the beach from S4-S5 to the right boundary. Wave 

 energy windows, breaking waves, and longshore sand transport rates are 

 determined automatically by GENESIS for the three domains on the basis of the 

 input data. 



Multiple diffraction 



166. If an energy window is bounded by two sources of wave diffraction, 

 one on the left (L) and one on the right (R) , each will have an associated 

 diffraction coefficient, K DL and K DR , respectively. The internal wave 

 model calculates a combined diffraction coefficient K D for the window as 



Km Kn 



(22) 



as shown in Figure 17. If an energy window is open on one side, the diffrac- 

 tion coefficient for that side is set equal to 1.0. 



y/////////A 



0.5 - 



Y//////////, 



l DL 



DISTANCE ALONGSHORE 



Figure 17. Diffraction coefficient for two sources 



80 



