SUBMERGED ROCK OUTCROP 



PREDOMINANT 

 LONGSHORE 

 TRANSPORT 



PREDOMINANT WAVE DIRECTION 

 AT STRUCTURE DURING SUMMER 



AVERAGE WAVE DIRECTION 

 AT STRUCTURE 



PREDOMINANT WAVE DIRECTION 

 AT STRUCTURE DURING WINTER 



Figure B2. Layout of design for a series of unconnected salients 



transported through the project area to avoid such problems. A protection 

 scheme should be devised by the use of a detached breakwater that will halt 

 the erosion of the historic site and provide a recreational beach without any 

 adverse effects to the adjacent nonpark property. 

 Solution 



5. Because the project is relatively long and the longshore drift dur- 

 ing the summer is to be maintained as much as possible, a technique for trans- 

 mitting sand past the structure must be used. One solution would be the use 

 of a segmented structure designed to cause salients to develop. Because the 

 erosion is caused by longshore transport and not offshore transport, the 

 shoreline opposite the gaps can be stabilized in a significantly advanced 

 position. Tombolos should not be allowed to form in order to minimize inter- 

 ruption of the longshore transport and to keep bathers away from the struc- 

 ture. A beachfill is placed, advancing the eroded shoreline to the position 

 of the updrift beach. The gap size and orientation of the breakwater segments 



B3 



