Series D' and E' were similar to Series B' except with different target peak 

 periods. The different spectra also produced different characteristic wave heights at the 

 toe of the structure. Series F' and G' were similar to Series B' and D' except that riprap 

 was used as armoring. Series F' had the same wave peak periods as Series B' while 

 Series G' had the same wave peak periods as Series D'. Therefore, Series B',D', £", F', 

 and G' provide comparative damage measurements with systematic variation of armor 

 gradation and wave period. 



As shown in Table 7.1, the order of water levels, individual storm durations, 

 and series durations for Series D', E', F', and G' were identical to Series B'. Four storms 

 were run within each test series following 30 min of shakedown waves, with the low- 

 water-level storms run first followed by the high-water-level ones. The duration of each 

 of 4 storms was 2 hours yielding 8.5 hours of waves for each series. Wave heights were 

 incrementally raised at each water level to simulate increasing storm severity. The 

 waves were run in 15 min bursts, with the water completely settling between bursts. As 

 was done for Series A', B', and C, the 2 structures were profiled every 30 min using 

 eight profile rods across the center portion of each structure. Each storm series was 

 repeated to yield 32 profiles alongshore for the undamaged underlayer and armor layer 

 and after every 30 min of waves. As discussed in Chapter 5, the mean and standard 

 deviation of E, C, L, and S for these 32 profiles were computed. 



The armor stone for Series F' and G' was widely graded riprap with a 

 median mass M^^ = 256 g, nominal diameter Z)„5o = (M,(/pa)"^ = 4.58 cm, stone density 



129 



