Abstract
Swell develops an orbital motion of fluid particles, excluding any technique of measurement of the velocities using a material support, because the disturbance induced by the probe comes back to the point of measurement. Laser Doppler velocimetry allows a sharp measurement of instantaneous velocities and turbulence in fluid flows, without disturbing the movement of the fluid particles. Accordingly, we have adapted this technique so as to analyze: (1) the oscillatory boundary layer generated by swell on the sea-bed; and (2) the swell effect on structures. Our results impose restraints on certain modelizations.
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