Abstract
The application of Particle Image Velocimetry (PIV) to the measurement of velocity distributions under water waves is described. Two-dimensional water waves are generated in a laboratory wave flume with the measurement area illuminated by a powerful CW Argon ion laser. Photographic recording and subsequent electro-optical analysis of the film provides the displacement and hence velocity field for passing waves. The accuracy and reliability of the technique is illustrated by typical experimental results and a comparison with Linear wave theory.
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