Figure 1 1 . Inlet through a barrier stabilized by jetties. Note the large amount of sand 

 trapped by the larger jetty and recession of the shore across the inlet 



Figure 12. Beach protection structures, Cartagena, Columbia (1981). Although the city is 

 built on the barrier beaches which protected the original Spanish anchorage, the 

 present shoreline suffers from a lack of sand, and the beaches are narrow or are 

 entirely missing in some areas 



