Abstract

The wave forces in the surface zone for a single pile have been measured with regular waves in a laboratory. Reynolds numbers of up to 6×104 were used and the KC numbers were in the range 10–55. The wave force was found to be zero at a height ucr2/2g above the wave crest elevation and at a maximum approximately ucr2/2g below the wave crest elevation. The results have been analyzed in view of the Morison equation, and CD and CM coefficients have been obtained. Due to the fact that the measurements have been carried out with Reynolds numbers less than 6×104, it is recommended for design purposes to use the trend of the CD and CM values versus location on the pile as found from the laboratory tests in conjunction with CD and CM values as found for the appropriate flow regimes in full scale.

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