VERTICAL-DISPLACEMENT 

 WAVE GENERATOR 



TEST 

 SECTION 



1:100 SLOPE 



CATCH 

 BASIN 



WAVE 

 ABSORBER 



Figure 1 1 . Wave flume cross section 



The recommended breakwater plan (Figure 12) demonstrated acceptable stability 

 on the crown and sea-side slope. It was recommended that placed-stone construc- 

 tion techniques be used during prototype construction and that 50 percent of the 

 stone used in the primary armor layers be parallelepiped in shape and the remaining 

 stones be rough angular in shape. Also, the two stone shapes should be kept well- 

 mixed on the structure. It was also noted that the sea-side toe should be constructed 

 with the Ml weight range of 16,330-kg (18-ton) stone, and care should be taken to 

 ensure good construction placement of the randomly placed toe stones. The place- 

 ment of a row of 16,330-kg (18-ton) stone (2 stones wide) was recommended on the 

 crest of the structure to reduce overtopping rates to within acceptable levels. These 

 stones should be placed with the long axis of the stones parallel to the longitudinal 

 axis of the breakwater. A model view of the recommended plan is shown in 

 Figure 13. 



SEA SIDE 



.1.0 FT "►! 210 "^T 



•>^ 



^^^"t^ 



^ 





20.6 FT 





HARBOR SIDE 



+ 10.0 FT 





i* — !. 





( T ; 



+ 34.6 F 



^^ 



+ 18.0 FT 



^^wH2 O^S. 



+ 11.0 FT 





^^ +5.5 FT ? 



•2S.0 FT 



^ 





.l,;sfT MiS-OFtI^ 





QUARRY RUN 



-22.0 R -HlOOFf/^ 2 TON STONE 



^ 





Figure 12. Cross section of recommended breakwater 



The recommended breakwater plan tested in the 2-D model differed slightly fi-om 

 the design ctoss section. The underlayer stone was constructed to its design el and 

 two layers of 16,330-kg (18-ton) armor stone were specially placed. The design 

 indicated the thickness of two layers of armor stone would be 4.3 m (14 ft); how- 

 ever, after placement in the model, surveys indicated the thickness was 5.1 m 

 (16.6 ft). This resulted in a crest el of +10.5 m (+34.6 ft) for the primary armor 

 layer as opposed to the +9.8-m (+32-ft) design el. After placement of the extra 

 layer of armor stones on the crest (with the long axis of the stone parallel to the 



14 



Chapter 1 Introduction 



