(6) Height of Wave Crest Above Bottom (see Fig. 7-88) 



y = d + h + ^ t ^ H. 

 a s 2 ^ 



m 



y^ = 13.5 + 2.22 + 1^^-^) (6) 



y = 21.72 m 

 c 



Wave will overtop caisson by 1.2 meters; therefore assume structure is not 

 100 percent reflective. Use 0.9 and recalculate h 



h 



-rf- = 0.36 (see Fig. 7-93) 

 n . 



h = 0.36 H. = 0.36 (6) = 2.16 m 

 o ^ 



y = 13.5 + 2.16 + y- ^2'^ ] ^^^ " ^^'^^ ™ 



(7) Dimensionless Force (Wave Crest at Structure) (see Fig. 

 7-94) . For 



H H 



-^ J = 0.0101 , -T^ = -^ = 0.444 , and x = 0.9 



gT (9.806)(7.78)^ s 



F 



^ = 0.33, F = 0.33 (10.05) fl3.5l^ = 604.48 — (force due to wave) 



.la m 



w d 



s 



Hydrostatic force is not included. 



(8) Hydrostatic Force. 



„,2 .,. ... .,. .,2 



F = 



wd^ ^ (10.05) [13.5]^ ^ 915.81 ^^ 



2 2 ^^^.^^ ^ 



(9) Total Force. 



F = 604.43 + 915.81 = 1520.24 -^ 

 t m 



(10) Force Reduction Due to Low Height . 



b = 12.0 + 8.5 = 20.50 m 



y = 21.36 m 

 



8-77 



