Figure 85. Simulation with and without seawall 



Profile with seawall and beach fill 



528. To evaluate the performance of the model for more complex condi- 

 tions , a simulation was carried out for a time period involving both mildly 

 erosive or accretionary waves, a storm event, and a recovery period. Further- 

 more, a seawall was located in the subaerial part of the profile, and beach 

 profile response was calculated both with and without beach fill. Two 

 different beach fill schemes and grain sizes were evaluated, one case where 

 material was added as an artificial berm above the still -water level and 

 another case where the material was spread out mainly below the still -water 

 level according to the equilibrium shape associated with the natural sand. 

 The wave height and water level of the simulated event are illustrated in 

 Figure 86 (note that the time scale is distorted) . 



529. During the first 21 days of the simulation, the wave height was 

 0.5 m and the wave period 8 sec, producing mildly erosional or accretionary 

 conditions depending on the grain size. The beach profile was thus allowed to 

 attain its equilibrium shape for the prevailing wave conditions. At day 21, a 



224 



