SOLUTION: The runup on a 1 on 3 slope (tan = 0.33) is first calculated to 

 determine whether the runup will exceed the berm elevation. Calculate 



'^ 1-2=0.8 



% 1.5 



and 



H- 



° ^'^ = 0.0024 



gT^ (9.8) (8)2 



From Figure 7-10 for 

 d. 



1P= 0.8 



with 



and 



cot (0) = 1/tan (0) = 3.0 



— r- = 0.0024 

 gT 



|.=2.8 

 o 

 This runup is corrected for scale effects by using Figure 7-13 with tan = 

 0.33 and H « 1.5 m (4.9 ft). A correction factor k = 1.15 is obtained, 

 and 



R = 2.8 k H^ = 2.8 (1.15) (1.5) 



R = 4.8 m (15.7 ft) 



which is 3.0 m (9.8 ft) above the berm elevation (see Fig. 7-21). There- 

 fore, the composite-slope method must be used. 



The breaker depth for the given design wave is first determined with 



H' 



= 0.0024 



calculate 



8X2 



^= 2.(1.5) ^ 0^0,3 



^o (9.8) (8)^ 



2 

 Enter Figure 7-3 with H'/gT = 0.0024 , using the curve for the given slope 



m = 0.050 (1:20) , and find 



7-37 



