Note the large increase in n^ above the Airy estimate of H/2 = 5.0 £t. 

 and the relatively small change of drag and inertia forces along the 

 pile. Tlie wave condition approaches that of a long wave or shallow- 

 water wave. 



************************************* 



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



GIVEN : Same wave conditions as preceding problem H = 10 ft. and 

 T = 10 sec; however, the depth d = 100 ft. 



FIND : Crest elevation above Stillwater level, wavelength, and the 

 relative variation of force components along the pile. 



SOLUTION : Calculate, 



d 100 



gT^ 32.2(10)^ 

 H 10 



0.031 , 



= 0.0031 . 



gT^ 32.2 (10)^ 

 From Figure 7-40, 



L^ = 0.89 L^ = 0.89 (5.12) T^ = 455 ft., 

 K = 0.46 . 

 From Figure 7-41, 



T]^ = 0.52 H = 5.2 ft. 

 From Figure 7-42, 



L = 1.01 L^ = 460 ft. 



and 



^i (z = -d) 

 K = -Y = 0.46. 



^D (z = -d) 

 K2 = —^ = 0.21 . 



^D(z = 0) 



Note the large decrease in forces with depth. The wave condition 

 approaches that of a deepwater wave. 



************************************* 



7-73 



