



Table 



4. Changes in 



the configuration of s 



indbag 



breakwaters 



under 



wave ac 



tion. 





Wave condition 



Duration 



Bag 

 layers 



Structure 

 height 



Crest elevation 



Crest width 



Seaward- face 

 slope 



Hi 



T 



(h) 



No. of 



(ft) 



(m) 



Avg. of 

 crest area 



Change 

 in avg. 



(ft) 



(m) 





(ft) 





(s) 



(ft) 1 (m) 



(ft) 1 (m) 





Test I 1 















3 



3.2 



0.98 



2.9 



0.88 







7.1 



2.16 



1 on 4.2 



a 



4.0 



1.22 



6 



1.75 



1,050 













0.2 



0.06 





















3 



3.0 



0.92 



2.7 



0.82 







7.5 



2.29 



1 on 4.4 



b 



3.9 



1.19 



10 



2.00 



720 













0.1 



0.03 





















3 



2.9 



0.88 



2.6 



0.79 







8.2 



2.50 



1 on 4.6 















Tank drained and refilled 

























3 



2.6 



0.79 



2.3 



0.70 







8.0 



2.44 



1 on 4.0 



c 



5.8 



1.77 



6- 



3.58 



2,150 













0.1 



0.03 





















3 



2.5 



0.77 



2.2 



0.67 







7.4 



2.26 



1 on 2.4 



d 



5.7 



1.74 



10 



2.50 



900 





































3 



2.5 



0.77 



2.2 



0.67 







7.6 



2.32 



1 on 2.8 



Test II 1 















6 



7.0 



2.13 



6.9 



2.10 







7.0 



2.13 



1 on 2.2 



a 



4.0 



1.22 



6 



4.00 



2,400 













1.2 



0.36 





















S 



5.8 



1.77 



5.7 



1.74 







12.3 



3.75 



1 on 2.4 



b 



3.9 



1.19 



10 



1.25 



450 





































5 



5.9 



1.80 



5.7 



1.74 







12.3 



3.75 



1 on 2.4 



c 



5.8 



1.77 



6 



5.92 



3,550 













0.5 



O.IS 





















5 



5.3 



1.62 



5.2 



1.58 







13.7 



4.18 



1 on 2.8 



d 



5.7 



1.74 



10 



1.53 



552 





































5 



5.3 



1.62 



5.2 



1.S8 







13.4 



4.08 



1 on 2.6 



Test III 1 















11 



12.1 



3.69 



12.0 



3.66 







14.1 



4.30 



1 on 3.6 



a 



4.0 



1.22 



6 



1.15 



690 













1.1 



0.34 





















10 



11.3 



3.44 



10.9 



3.32 







23.5 



7.16 



1 on 3.2 



al 



4.0 



1.22 



6 



2.82 



1,690 













0.1 



0.03 





















10 



11. 1 



3.38 



10.8 



3.29 







25.2 



7.68 



1 on 3.4 



b 



3.9 



1.19 



10 



1.23 



444 





































10 



11. 1 



3.38 



10.8 



3.29 







24.4 



7.44 



1 on 3.5 



c 



5.8 



1.77 



6 



4.23 



2,540 













0.7 



0.21 





















10 



10.9 



3.32 



10.1 



3.08 







26.0 



7.92 



1 on 4.0 



d 



5.7 



1.74 



10 



1.22 



438 













0.2 



0.06 





















10 



10.5 



3.20 



9.9 



3.02 







25.6 



7.80 



1 on 4.2 



Test IV 1 















15 



16.4 



5.00 



16.0 



4.88 







13.8 



.4.21 



1 on 3.0 



a 



4.0 



1.22 



6 



1.20 



720 













0.1 



0.03 





















15 



16.1 



4.91 



15.9 



4.85 







8.6 



2.62 



1 on 4.2 



b 



3.9 



1. 19 



10 



0.70 



252 





































15 



15.0 



4.88 



15.9 



4.85 







8.7 



2.65 



1 on 4.2 



c 



5.8 



1.77 



6 



1.67 



1,000 













1.7 



0.52 





















14 



14.8 



4. 51 



14.2 



4.33 







9.0 



2.74 



1 on 5.3 



\After loss of top layer of bags. 



NOTE: Slope and elevation are measured from average profiles. 



60 



