Smooth Impermeable 



0.5 



1.0 m 



BWl 



Figure A-1. Breakwater 1 cross section. 



BWl is a smooth impermeable structure tested for wave transmission by 

 overtopping and reflection. Note that simultaneous measurements of wave 

 runup were being made on a smooth 1 on 1.5 slope in an adjacent flume by 

 Ahrens (1978) while the breakwater tests were underway (see Fig. 1). 



B = 30 cm 



hs = 70 cm 



Figure A-2. Breakwater 2 cross section. 



BW2 is similar to a casson breakwater that has been rehabilitated by 

 adding rock armor units. The major emphasis of these tests was to examine 

 the effects of wave period and height on transmission and reflection. Armor 

 material was randomly placed. 



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