CONTENTS 



FIGURES-Continued 



Page 



41 Front face before wave action 50 



42 Backface before wave action 50 



43 Wave breaking on front face after loss of seaward row of bags on 



breakwater crest during wave condition a 51 



44 Breaking wave overtopping after loss of seaward row of bags on 



breakwater crest during wave condition a 51 



45 Front face slumping after 30 waves during wave condition a . . . 52 



46 Front face after 50 waves shows seaward row of bags missing from 



breakwater crest during wave condition a 53 



47 Backface after 50 waves shows shoreward row of bags across crest 



intact during wave condition a 53 



48 Test IV. Changes in structure IV average profile for three 



wave conditions 54 



49 Front face at end of test IV 56 



50 Backface at end of test IV 56 



51 First bag-grip design picking up bag 57 



52 First bag-grip design holding bag 57 



53 Improved bag-grip design picking up bag 58 



54 Improved bag-grip design holding bag 58 



55 Effects of wave action on structure configuration 61 



56 Wave attenuation versus relative crest elevation for sandbag 



breakwater 67 



