SEAWALL 



Figure 38. Definition sketch for a semi-infinite seawall for 

 which no erosion occurs behind the seawall 



80. Figure 39 illustrates the case of erosion at the side and behind a 

 seawall, i.e., flanking of the seawall. This must be solved as a coupled 



problem. The incident breaking wave angle is 



oz 



outside the seawall and 



a . behind it. Wave energy is transported behind the seawall by the process 

 of diffraction. 



SHORELINE 



Figure 39. Definition sketch for a semi-infinite seawall 

 for which erosion occurs behind the seawall 



61 



