Contents 



Preface vi 



Conversion Factors, Non-SI to SI Units of Measurement vii 



1 — Introduction 1 



Overview of Study Site 1 



Problem Statement.... 2 



Units of Measurement 4 



Organization of tliis Report 4 



2 — Summary of Acting Coastal Processes 5 



Long Branch Gauge Analysis 5 



Beach Profile 6 



3 — Functional Design 12 



Empirical Evaluation of Groin Performance 12 



GENESIS Simulation of Physical Model Results 15 



Calibration 17 



Modeling T-head groins 17 



Model Evaluation of Design Alternatives 19 



Calibration 20 



Design alternatives 24 



Recommended alternatives 32 



Variability 34 



Summary and Conclusions 36 



4 — Structure Design 38 



Existing Structures 38 



Structure Design 41 



Design wave 41 



Calculation of stone size and damage potential 44 



Construction Details 51 



Stone Volume/Weight Estimate 53 



5 — Conclusions 56 



Functional Design 56 



