The experiments supporting Table 3.1 were conducted with regular waves, so measured 

 damage approached an equilibrium after a relatively short duration. Therefore damage 

 is not a function of storm duration in Equation 3.6. Figure 3.2 shows data from Table 

 3. 1 and damage given by Equation 3.6. The relation utilizes H, the regular wave height, 

 and Hjg, the no-damage regular wave height corresponding to to 5 percent damage by 

 the eroded volume method. This damage relation shows how damage varies with wave 

 height but it assumes starting with an undamaged structure and damage approaching an 

 equilibrium level. 



50 



^ 40 

 Q 



30 



D) 

 CO 



1 20 



10 

 











i \ ^' 





Best Fit Line 



Equation 3.6 







\ \ 



■' 



; ; 



\ 



• 







.m-' 





1 — 1 — 1 — 1 1 — 



1 — > — i — > — j — 1 — 



1 



1.1 1.2 1.3 1.4 1.5 1.6 



HIH. 



do 



Figure 3.2. Damage, characterized as eroded volume, as a function of monochromatic 

 wave height for angular stone (SPM 1984) 



Van der Meer (1988) reanalyzed data from Thompson and Shuttler (1976) 

 and conducted a number of additional experiments and found the damage index 5 to be 

 related to the number of waves A^„., the significant wave height H^,^, and the mean wave 



46 



