Accession Number : AD0616303

Title :   A REFRACTIVE TECHNIQUE FOR MEASUREMENT OF WATER WAVE SLOPE.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Williams,Kingsley G.

Report Date : SEP 1964

Pagination or Media Count : 26

Abstract : A method for study of the slope and radius of curvature spectra of wind-driven water surfaces based on recording the peregrinations of a beam of light projected vertically upward from beneath the water surface to a horizontal plane is examined. The ratios between receiver height, anticipated wave amplitude and receiver diameter control the accuracy of the method. For a 1 degree accuracy in slope measurement and a 5% accuracy in radius of curvature measurements, the method appears feasible for wave amplitudes of up to four inches. Resolution capability of 1-2 mm is expected. A preliminary model, tested in sheltered water, provided a record which proved amenable to analysis within the limits imposed by design expediencies in the apparatus. Descriptive data is given of the distribution of apparent wave period, mean slope and angular dispersion of wave slope maxima. (Author)

Descriptors :   (*WATER WAVES, MEASUREMENT), REFRACTION, OCEAN WAVES, OPTICAL PROPERTIES, OPTICAL EQUIPMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE