Forces exerted by waves on a sloping board

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Abstract
A piece of plywood was mounted on six strain‐gage cells in a wave tank to determine wave forces on a mildly sloping plane. Wave heights upwind and downwind were measured to find its effectiveness as a stilling device. The measurements showed that the reactions of the supports did not exceed those that would be produced by a uniform hydrostatic loading equal to 0.8 of the wave height applied alternately upward and downward. A properly placed board reduced wave heights downwind to less than 60 per cent of the height upwind provided their length was not more than four times the board width measured parallel to the direction of wave propagation. Waves about as long as the board width were reduced as much as 90 per cent. A method of estimating wave loading is suggested.

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