Turbulence experiments in the swash zone

Turbulence and water surface elevation measurements were carried out in the swash zone which was induced by plunging and collapsing breakers in a wave flume. Three different period regular waves were generated on a 1/10 smoot h impermeable concrete beach and the water surface elevations were collecte d by a number of wave gauges and a run-up meter lying on the bottom. Veloci ty measurements were carried out by a Laser Doppler velocimeter system, at spatial steps of 1 mm from the bottom, alone three vertical sections in the swash zone. The data have been used to describe the wave front dynamics, to derive the length and velocity macro and micro scales and the Eulerian frequency spect rum. In some points, it shows a double structure. The results add to and expand on similar results obtained by other research ers in the surf zone. (C) 2001 Elsevier Science B.V. All rights reserved.