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Combined slope-height measurements of short wind waves: first results from field and laboratory measurements

A new optical instrument has been designed for combined slope/height measurements of the small-scale structure of the ocean surface. The compact and rugged sensor head contains two light sources and a short-base CCD stereo camera setup mounted 4 - 6 m above the water surface and looking straight down onto the water surface. It takes stereo images of the specular reflexes on the water surface representing slope zero-crossings in a sector of about 30 X 40 cm2. The height of the reflexes can be determined with a precision of about 2 mm. Experiments have been performed in the wind/wave flume of Delft Hydraulics, at the Scripps pier, and at the Noordwijk research platform in the North Sea. In these campaigns, a total of about half a million stereo images have been taken with continuous time series of up to 8 min at 30 frames/s. Some preliminary results are shown.