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Title: Wave transformation at isolated vertical piles in shallow water
Authors: Hallermeier, Robert J.
Ray, Robert E.
Keywords: Surface waves (Oceanography)
Ocean waves
Piling (Civil engineering)
Water waves
Publisher: Coastal Engineering Research Center (U.S.)
Series/Report no.: Technical paper;no. 78-1
Abstract: Abstract: Water level was measured within the flanges of a channeled pile, or near the surface of a circular pile, for isolated piles in a periodic wave train. Measurements are plotted as 160 patterns of crest height versus orientation with respect to wave direction. All patterns have a maximum at the front, facing into the wave, and a lesser maximum at the rear. Intervening minimums are symmetrically located at the sides of the pattern, usually slightly toward the rear. As wave height increases, the front maximum becomes higher, depending on calculated velocity head. The angular width of the front maximum depends on channel geometry of the pile, tending to be very broad for a pile without channels and narrow for a pile with deep channels. With H-piles having deep channels, the pattern minimums occur farther forward than with unchanneled piles. Geometrically similar piles of different size result in similar patterns. The patterns for finned and smooth circular piles are similar, except that the finned pile results in slightly higher and narrower front and rear maximums. Applications of the reported conclusions to the design of nearshore pilesupported structures are briefly discussed. Twelve different vertical piles were tested, including circular, circular with radial fins, and various H-sections. Pile cross section and water depth were small compared to wavelength, corresponding to typical nearshore situations. Electrical gage records and photos show complicated surface effects occur near the piles. Crest stagnation can be similar at circular and channeled piles with three stagnation regimes: smooth, breaking, and jetting runup. Smooth runup occurred in most tests, with a nonbreaking bow wave formed at the front of the pile during peak forward flow.
Description: Technical Paper
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Paper

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