The thesis deals with wave forces on a slender surface-piercing vertical cylinder. Measurements of the total wave force, the pressure distribution, the local water level and the particle kinematics under the wave were made. The major areas of findings concern: The importance of using relevant wave kinematics for the calculation of wave forces; The influence of a free water surface on the pressure distribution and resulting wave force; An alternative r.m.s. technique for the calculation of maximum forces along the cylinder. Further work is needed with regard to the effect of the free surface on a time dependent separated wave flow i.e. wave forces, near the actual water surface, caused by both non-breaking and breaking waves.
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