This book discusses the subject of wave/current flow around a cylinder, the forces induced on the cylinder by the flow, and the vibration pattern of slender structures in a marine environment. The primary aim of the book is to describe the flow pattern and the resulting load which develops when waves or current meet a cylinder. Special attention is paid to circular cylinder. The development in the forces is related to the various flow patterns and is discussed in detail. Regular as well as irregular waves are considered, and special cases like wall proximities (pipelines) are also investigated. Contents: *Flow Around a Cylinder in Steady Current *Forces on a Cylinder in Steady Current *Flow Around a Cylinder in Oscillatory Flows *Forces on a Cylinder in Regular Waves *Mathematical and Numerical Treatment of Flow Around a Cylinder *Diffraction Effect. Forces on Large Bodies *Forces on a Cylinder in Irregular Waves *Flow-Induced Vibrations of a Free Cylinder in Steady Currents *Flow-Induced Vibrations of a Free Cylinder in Waves *Vibrations of Marine Pipelines *Mathematical Modelling of Flow-Induced Vibrations