On the Bottom Friction Factors off Five Japanese Coasts

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Abstract
SYNOPSIS In forecasting ocean waves in shallow water, the value of the bottom friction factor must be known for the calculation of wave energy loss due to bottom friction. In this paper the attenuation data of both significant and mean wave height and the transformation data of wave spectra at five different Japanese coastal stations have been used to compute the bottom friction factor. The relationship between this factor and the wave Reynolds number is presented. It should be noted that the values of friction factor obtained from the studied areas are much greater than the Bretschneider's assumed factor of 0.01 which is generally used in forecasting ocean waves in shallow water.

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