armor units to the highest vertical forces at the steep front of a plunging wave, which is 

 the worst case for armor stability. 



Table 6.1 



Depth-Limited Wave Damage Data from Van der Meer | 



1988) 



Test 



Toe 

 Depth 

 h„ 

 m 



Wave 

 Height 



m 



Mean 

 Per- 

 iod 



sec 



HJh, 



Ns 



Beach 

 Slope 



^for 

 Struc- 

 ture 

 Slope 



Sfor 

 1,000 



Sfor 

 3,000 



1 



0.4 



0.1253 



1.68 



0.31 



2.16 



0.198 



2.97 



8.51 



12.69 



2 



0.4 



0.0900 



1.69 



0.23 



1.55 



0.235 



3.52 



0.86 



1.56 



3 



0.4 



0.1088 



1.68 



0.27 



1.87 



0.212 



3.18 



2.85 



4.05 



4 



0.4 



0.1359 



1.67 



0.34 



2.34 



0.189 



2.83 



10.15 



18.15 



5 



0.4 



0.1286 



2.19 



0.32 



2.21 



0.255 



3.82 



6.04 



9.85 



6 



0.4 



0.1052 



2.19 



0.26 



1.81 



0.281 



4.22 



1.16 



2.15 



7 



0.4 



0.1555 



2.18 



0.39 



2.67 



0.231 



3.46 



8.78 



20.04 



8 



0.4 



0.1215 



2.20 



0.30 



2.09 



0.263 



3.94 



4.78 



7.19 



9 



0.2 



0.1345 



2.18 



0.67 



2.31 



0.248 



3.72 



4.50 



6.29 



10 



0.2 



0.1275 



2.17 



0.64 



2.19 



0.253 



3.80 



3.05 



3.00 



11 



0.2 



0.1415 



2.17 



0.71 



2.43 



0.241 



3.61 



5.13 



6.43 



12 



0.2 



0.1445 



2.18 



0.72 



2.49 



0.239 



3.58 



6.52 



12.45 



13 



0.2 



0.1270 



1.70 



0.64 



2.18 



0.199 



2.98 



2.27 



3.63 



14 



0.2 



0.1320 



1.73 



0.66 



2.27 



0.199 



2.98 



4.97 



7.97 



15 



0.2 



0.1350 



1.74 



0.68 



2.32 



0.197 



2.96 



6.65 



11.03 



16 



0.2 



0.1350 



1.77 



0.68 



2.32 



0.201 



3.01 



8.65 



11.38 



Consider Equations 3.7 and 3.8, which are Van der Meer's equations for 

 stability that include damage as a parameter. The stability number was a minimum at 

 the transition between plunging and surging waves occurring at 



119 



