5.4 Temporal Damage Development 



The means and standard deviations of 5, £, and C are used hereafter to 

 examine damage progression. Figure 5.5 shows the structures prior to Series A'. 

 Figures 5.6 through 5.8 show the measured profiles at the beginning, midway through, 

 and at the end of Series A '. In Figure 5.6, one profile and the average of all eight 

 profiles on one of the structures at the beginning of Series A' are shown. In Figure 5.7, 

 the average profile is shown along with a photo of the structures at the midway point of 

 the series. This figure corresponds to an average damage level of S= 6.5. It may be 

 seen from the photo that the top stones in the cover layer have been eroded sporadically 

 over a wide region near the still water level. Figure 5.8 shows one profile and the 

 average profile at the end of Series A', where the underlayer is exposed through a hole of 

 D„5o diameter. Figure 5.9 shows photos of the structures following Series A '. It is clear 

 that most of the armor layer has been mobilized. 



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