CONTENTS 



Page 



CONVERSION FACTORS, U.S. CUSTOMARY TO METRIC (SI) 7 



SYMBOLS AND DEFINITIONS 8 



I INTRODUCTION 11 



II WEIR- JETTY SYSTEM 13 



III ELEMENTS OF A WEIR-JETTY SYSTEM 17 



1. Navigation Channel 17 



2. Jetty Structures 17 



3. Weir Structure 19 



4. Deposition Basin 23 



5. Updrift Beach 25 



6. Downdrift Beach 25 



IV WEIR HYDRAULICS 26 



V WAVE CONDITIONS IN DEPOSITION BASIN 35 



VI EFFECT OF PROJECT ON SEDIMENT BUDGET 41 



1. Preproject Sediment Budget 41 



2. Postproject Sediment Budget 44 



VII UPDRIFT BEACH AND DEPOSITON BASIN STORAGE ANALYSIS 48 



VIII WEIR SECTION LENGTH 49 



IX POSTCONSTRUCTION PROFILE ADJUSTMENT 53 



X DESIGN OF UPDRIFT BEACH 55 



XI APPLICATION OF HYDRAULIC MODELS TO THE DESIGN OF WEIR-JETTY 



SYSTEMS 59 



1. Hydraulics of Inlet Changes 59 



2. Scour, Deposition, and Sediment Transport 60 



3. Jetty Structure Stability 61 



LITERATURE CITED 62 



TABLES 



1 Characteristics of weir sections and wave conditions at existing 



weir-jetty complexes 20 



2 Weir discharge calculations for weir crest at MTL 30 



3 Weir discharge calculations for weir crest 1.5 feet below MTL 31 



4 Computation of wave overtopping rates for example problem 2 34 



5 Computation of wave transmission by overtopping for example problem 3.. 38 



6 Computation of wave transmission by overtopping for example problem 4.. 40 



