Abstract
Methods are presented for calculating directly from a known wave height, period and water depth the orbital velocity produced at the sea bed by surface waves. Two curves are sufficient to allow the root-mean-square bottom orbital velocity to be calculated for wave-spectra having any one of the JONSWAP, Pierson-Moskowitz, Bretschneider, ISSC or ITTC forms. A third curve covers the monochromatic case. Other curves allow the ratio of the peak periods of bottom orbital velocity and surface elevation to be calculated for the above five spectral forms. Values are deduced for the height and period of the monochromatic wave which most closely matches the bottom orbital velocity obtained from a full spectral representation, optimised over water depths ranging from deep water to breaking.
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