CONTENTS 



TABLES-Continued 



Page 



3 Sandbag weights in air and submerged 15 



4 Changes in the configuration of sandbag breakwaters under wave 



action 60 



5 Wave transmission by sandbag breakwaters 65 



FIGURES 



1 Sandbag exposed to sunlight, October 1967 .... 11 



2 Sandbag exposed to sunlight, September 1968 11 



3 Submerged bag weight versus time 16 



4 Ratio of submerged to dry bag weights versus time 18 



5 Wave tank test situation and survey ranges 19 



6 Calibration curves for the large wave tank with a 3-foot-deep 



sand layer on the bottom 21 



7 Structural scheme in profile 22 



8 Hanging bag for filling 24 



9 Filling bag 25 



10 Sewing bag opening closed 25 



11 Placing bag 26 



12 Test I. Changes in structure I average profile for four wave 



conditions 30 



13 Front face after midtest tank draining 31 



14 Backface after midtest tank draining 31 



15 Sand bed to seaward, midtest tank draining 32 



16 Wave "peaking up" during wave condition d 33 



17 Front face at end of test I 35 



18 Backface at end of test I 35 



5 



