CONTENTS— Continued 



FIGURES 



Page 



1 Sand impounded in updrift beach adjacent to jetty 12 



2 Impoundment area at distal end of a shore-connected breakwater 12 



3 Impoundment area behind detached offshore breakwater 12 



4 Weir jetty with impoundment area between jetties 12 



5 Key elements of a typical weir- jetty system 13 



6 Time history of longshore sand transport past a point on the 



shoreline 15 



7 Sand transport and storage at an Ideal weir-jetty system 16 



8 Typical weir cross section for a rubble-mound weir 22 



9 Deposition area in a spit at St. Lucie Inlet, Florida 23 



10 Training dike to control location of navigation channel in a 



weir-jetty system 24 



11 Phase lag between ocean tide and channel tide across a model 



weir jetty 27 



12 Definition sketch of flow across weir with aerated nappe 27 



13 Conditions of weir flow at various times during a tidal cycle 28 



14 Definition sketch of flow across weir with submerged nappe 29 



15 Discharge over weir as a function of time during a tidal cycle. 30 



16 Discharge over weir as a function of time during a tidal cycle 32 



17 Beach profile adjacent to weir section 33 



18 Time variation of overtopping rate... 35 



19 Water level at weir as a function of time 38 



20 Time variation of incident and transmitted wave heights 39 



21 Time variation of incident and transmitted wave heights 40 



22 Conceptual layout of Bogue Banks, Beaufort 42 



23 Schematized sediment budget analysis for Beaufort Inlet, 



North Carolina 43 



5 



