CONTENTS 



Page 



PREFACE 1 



LIST OF FIGURES 3 



PART I : INTRODUCTION 4 



Overview 4 



Purpose of Seawalls 4 



Seawalls and the Shoreline Change Model 5 



Limitations of the Method 7 



PART II : BACKGROUND FOR THE SEAWALL BOUNDARY CONDITION 9 



Action of a Seawall on a Beach 9 



Seawall at Oarai Beach , Japan 10 



Idealized Seawall Boundary Condition 11 



PART III : SHORELINE MODEL AND THE SEAWALL BOUNDARY CONDITION 15 



Shoreline Model Review 15 



Model Input Requirements and Boundary Conditions 16 



Explicit Numerical Model 19 



Implicit Numerical Model 24 



PART IV : EXAMPLE CALCULATIONS . , 31 



General Comments 31 



Example 1 : Jetty and Detached Breakwater 32 



Example 2 : Pocket Beach 34 



Comparison of Accuracy and Efficiency of the Explicit 



Scheme and Implicit Scheme 36 



PART V : EXPLANATION OF COMPUTER PROGRAMS 38 



General Comments 38 



Programs YSEXP and YSIMP 39 



Programs CORRE and CORRI 40 



REFERENCES 41 



APPENDIX A: COMPUTER PROGRAM LISTINGS A1 



APPENDIX B: NOTATION B1 



