CONTENTS 



CHAPTER 6 



STRUCTURAL FEATURES 



Page 



I INTRODUCTION 6-1 



II SEAWALLS, BULKHEADS, AND REVETMENTS 6-1 



1 . Types 6-1 



2. Selection of Structural Type 6-13 



III PROTECTIVE BEACHES 6-14 



1 . General 6-14 



2. Existing Protective Beaches 6-16 



IV SAND DUNES 6-37 



1 . Sand Movement 6-37 



2 . Dune Formation 6-38 



3 . Dune Construction Using Sand Fencing 6-38 



4 . Dune Construction Using Vegetation 6-43 



V SAND BYPASSING 6-53 



1 . Fixed Bypassing Plants 6-54 



2 . Floating Bypassing Plants 6-59 



3 . Additional Bypassing Schemes 6-75 



VI GROINS 6-76 



1 . Types 6-76 



2. Selection of Type 6-84 



3 . Design 6-84 



VII JETTIES 6-84 



1 . Types 6-84 



VIII BREAKWATERS , SHORE-CONNECTED 6-88 



1 . Types 6-88 



IX BREAKWATERS, OFFSHORE 6-93 



1 . Types 6-93 



2. Segmented Offshore Breakwaters 6-95 



X CONSTRUCTION MATERIALS AND DESIGN PRACTICES 6-95 



1 . Concrete 6-95 



2 . Steel 6-96 



3 . Timber 6-96 



4 . Stone 6-97 



5. Geotextiles 6-97 



6 . Miscellaneous Design Practices 6-97 



LITERATURE CITED 6-99 



