where T is held constant at 7.0 seconds because the maximum wave 

 period results in the highest relative runup for each value of 

 dg/H^. The maximum runup of 7.05 meters (Table 3) does not occur 

 for the largest wave height since the largest waves break seaward 

 of the structure for the given wave period. 



Table 3. Example runup for T = 7 seconds, constant 



depth, and (H'l = 5.0 meters. 



r ' >. o j max 



Fig. 



i l 



H i 

 (m) 



gT 2 



ft_ 2 



R 

 Cm) 



20 



0.6 



5.0 



0.01041 



1.35 



6.75 



21 



1.0 



3.0 



0.00625 



2.35 



7.05 3 



22 



1.5 



.2.0 



0.00416 



2.8 



5.6 



23 



3.0 



1.0 



0.00208 



2.6 



2.6 



Mg/H^ values selected to correspond with values in 



figures; d s = 3.0 meters. 



2 cot e = 2.0. 

 3i 



*V 



7.05 meters, 



(b) For the second condition where T max = 13.0 seconds, the 

 maximum runup would occur for the lowest dg/H^ value. To check 

 l/l, for d = 15.0 meters: 



15(2) Q) 

 (9.8)(13) 2 



= 0.057 



j- = 0.1013 



L = 148. 1 meters ; 



120 

 148.1 



= 0.81 > 0.5 



Table 4 may be constructed for d s = 3.0 meters, T = 13.0 seconds, 

 gT 2 = 1,656.20 meters (5,434 feet) and using Figures 20 to 23. 

 Table 4 shows that, in this case, not only is the runup higher for 

 the longer wave period, but the maximum runup occurs at a lower 

 dg/H^ value for the maximum deepwater wave height. 



(c) For the third condition, suppose that wave steepness is 

 expected to be most important, and that the structure is being 

 designed for a constant wave steepness of H^/gT 2 = 0.0104 and a 

 maximum period of 7.0 seconds. 



58 



