(a) Sloping Wall 



(b) stepped Wall 



(c) Nonreentrant Face Wall 



•••*•■.■- 



(d) Reentrant Face Wall 

 Figure 7-82. Wall Shapes 

 ************** EXAMPLE PROBLEM *************** 



GIVEN: A structure in water, dg = 7.5 ft. on a 1:20 nearshore slope is 

 subjected to breaking waves, H^, = 8.4 ft., and period T = 6 sees. The 

 angle of wave approach is, a = 80° and the wall has a shoreward sloping 

 face of 10 (vertical) on 1 (horizontal). 



FIND : 



(a) The reduced total horizontal wave force. 



(b) The reduced total overturning moment about the toe 

 (neglect the vertical component of the hydrostatic force) . 



SOLUTION : From the example problem of Section 7.331 for the given wave 

 conditions, 



R^ = 16,900 Ibs./ft. 



Ib.-ft. 

 M^ = 126,800 — -- 



and 



R^ = 4,380 Ibs./ft. 



Ib.-ft. 

 M, - 17,100 —;— 

 ^ ft. 



7-166 



