Updrift Beach 



Jetfy 



BAY 



OCEAN 



Figure 1. Sand impounded in updrift 

 beach adjacent to jetty. 



Updrift Beach 



OCEAN 



Impoundment Area 



\ \ 



v \ Channel 

 \ \ 



Oowndrift Beach 



Placement Area 



Updrift Beach 



Offshore Breakwater 



mpoundment Area 



BAY 



OCEAN 



Figure 3c Impoundment area behind 



detached offshore breakwater. 



Figure 2. Impoundment area at distal end 

 of a shore-connected breakwater. 



Updrift Beach 



OCEAN 



BAY 



Figure 4. Weir jetty with impoundment 

 area between jetties. 



NOTE: — Figures 1 to 4 modified from Watts (1965). 



12 



