(d + H + h^) (wd + Pi)_ „^2 



(21) 



(d + h^ -H H)'^ (vd + P^) ^3 



^^e 







6 







6 



R. 

 1 



~ 2 " 



(d 



'\ 



- H) 



(vjd - 



h^ 







2 







M 



= ^- 



(d 



'^ 



-H)2 



(wd 



-V 



i 







6 







(22) 



(23) 

 (2li) 



These formulas for pressures created by the clapotis are based upon the 

 assumption that the vertical wall rests upon the natural bottom. If the 

 vertical wall rests on a stone foundation, the action of the wave depends 

 on the profile of the foundation structure, 



208, Wall of Low Height . - If the height of the wall is less than the 

 predicted wave height at the wall, forces may be approximated by drawing 

 the force polygons as if the wall were higher than the iiipinging wave, then 

 analysing only that portion below the wall crest. Thus in Figure 77 the force 

 due to a wave crest at the wall is conputed from the area AFBSC, 



wall elevation ^^^yyyjA '' 



still water level 



FIGURE 77. Pressure on walls of low height 



106 



