D = 8oO +• 



160 

 20 



I60O feet 



for 



D/L^ = ^ = 0.031 



d/Lj3 = 0„073 and L^ 



219 feet 



Lt68„ The total T,ave pressure of a wave normal to a vertical irall is 

 comprised of dynamic pressure and static pressurej in lidiich the dynamic 

 pressure of the breaking wave is 



^ ? \ 



d(D -f d) 



TT e X 6 X 6[|-,2 



219 



15 



X 2)4 



(157) 



21[t0 pounds per square foot 



The static pressure is 



^s = 



wH 



61io2 X 6 



193 pounds per square foot. 



U69o Fig'oce IU8 shows the wave pressure diagram for the x-ra.ve 

 breaking on the groin o 



li70„ The maximum wave pressure P is 

 P 



(P„ X ? ) + P^ (d + I) 



(158) 



= r2iUo X |) + 193 (8 + ^) = U280 + 1830 



= 6110 pounds per foot of wall 



This force acts at an angle (Of ) to tlie stimctureo Tte angle ( OC ) that 

 the waves strike is determined from the refraction diagram. The majcimum 

 angle of possible wave attack should be used. See Figur-e llj.9. Assuming 

 this angle as 30 degrees, the component of force normal to the structure 

 per unit length of structure would be 



P = (P X 

 n m. 



H 



) sin'a + Pg (d + I ) 

 U26O X 0.25 + 1830 = 2^900 pounds per linear foot of wall* 



221+ 



