Figure 34 concludes the display o£ effects of pile channels with 

 three data sets for the 2x2 H-pile, two sets from 96-foot tank tests, 

 and the other from an 85-foot tank test. The relative water depth, _ d/L, 

 is identical for the three tests. The data are presented as [H(6)/H], 

 because Stillwater datum is not clearly indicated on the record of the 

 85-foot tank test. The Reynolds and Froude numbers for the 85-foot tank 

 test are each bracketed by those for the 96-foot tank tests (see Table 8) 

 The plots of first and second angular differences show scatter but simi- 

 lar data trends, demonstrating that the pattern shapes are similar in 

 these situations. 



Table 



8. Calculations 



for [H(e)/H] patterns in F 



igure 34 . ^ 



Data set 

 in Fig. 34 



Wave 

 period, 

 T 

 (s) 



Water 



depth, 



d 



(ft) 



Wave 

 height, 

 H 

 (ft) 



Calculated 

 Reynolds number, 

 UX/v 



Calculated 



Froude number, 



u2/gX 



X 



+ 



2.35 

 1.55 

 1.55 



2.33 

 1.00 

 1.00 



0.56 

 0.24 

 0.37 



3.1-10'+ 

 2.0-10'+ 

 3.5-10'+ 



0.33 

 0.14 

 0.43 



^X = 0.22 foot and velocities calculated using stream-function tables. 



3. Conclusions . 



The peak water patterns for high waves ,at thin piles are somewhat 

 independent of pile shape. Basically similar patterns are obtained 

 with circular and channeled piles (Figs. 20 and 26); all patterns show 

 a front maximum region, a lesser maximum at the rear, and intervening 

 symmetrically located minimums . As incident crest height increases, 

 in patterns normalized by crest height, the front maximum becomes higher 

 in a manner consistent with crest stagnation, the rear maximum becomes 

 slightly lower, and the minimums generally become deeper (Figs. 21, 22, 

 23, 27, and 28). 



The patterns show several definite dependencies on pile shape. The 

 pattern minimums are farthest toward the rear for the smooth piles 

 (circular or flat plate), and the Tninimums are farther toward the front 

 for deeper pile channels (Figs. 26, 27, 28, and 31). Patterns for smooth 

 piles are less articulated than those for channeled piles (Figs. 20, 27, 

 and 28). At H-piles, maximum water level may occur away from g = 0° 

 (Figs. 20 and 28). The angular width of the front maximum region is 

 linearly related to an angle measuring the shallowness of the pile 

 channels (Table 7) . 



Piles of different size but identical shape give very similar peak 

 water patterns (Figs. 21, 23, 32, and 33). Similar stagnation effects 

 are recorded in test situations that are geometrically similar (identical 

 Froude number but different scale), although the Reynolds number has a 

 definite effect on the pattern away from the front maximum region 



59 



