Abstract
A novel nonintrusive optical wave gauge is developed to simultaneously measure three components of the wave field. The synchronous single point measurement of temporal variation of surface elevation and its orthogonal slope components allowed us to estimate directional spectra. Unlike in field experiments, where the directional wave spreading is affected also by variation in the wind direction, in a laboratory facility the wind is unidirectional thus allowing characterization of directional spreading as an intrinsic property of wind waves.
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