Shore 



Direction of Littoral Drift 



OCEAN 



NOTE! Materiel passing 

 updrift jetty moves Into 

 submorine canyon 



FIGURE 52. ESSENTIALLY COMPLETE LITTORAL BARRIER 



Shore 



Erosion Zone 



;^ 



Accretion Zone 



Offshore Breakwater 



30 Depth Contour 



Direction of Littoral Drift 

 OCEAN 



FIGURE 53. SUBSTANTIAL LITTORAL BARRIER 



note; Only material moving 

 in woter depth greater then 

 30" pass this littoral barrier 



Shore 



Ultimate occretion zone if 

 horbor not maintained 



Accretion Zones 



Direction of Littoral Drift 



OCEAN 



note; This will be a complete 

 littoral barrier until shoal 

 inside harbor reaches shore 



FIGURE 54. TEMPORARY LITTORAL BARRIER 



61 



