WAVE FORCES ON A VERTICAL SLENDER CYLINDER.

This thesis deals with wave forces on a slender surface-piercing vertical circular cylinder in shallow water. Measurements of the total wave force, the pressure distribution, the local water level, and the particle kinematics under the wave were made. The Reynolds numbers attained ranges between 0. 3 multiplied by (times) 10**5 and 2. 3 multiplied by (times) 10**5, the orbital shape parameter between 0. 03 and 0. 86 and the Keulegan-Carpenter number between 1 och 11. The basic phenomena for a time dependent separated flow are reviewed and applied for a wavy flow around a surface-piercing vertical cylinder. 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; and an alternative r. m. s. technique for the calculation of maximum forces along the cylinder.