Accession Number : AD0692124

Title :   THE ESTIMATION OF VECTOR WAVENUMBER SPECTRA BY MEANS OF DATA OBTAINED FROM A RAPIDLY MOVING HYDROFOIL VEHICLE.

Descriptive Note : Final technical rept. 1 Jan 68-31 Jul 69,

Corporate Author : OCEANICS INC PLAINVIEW N Y

Personal Author(s) : Pierson,Willard J. , Jr. ; Raff,Alfred I.

Report Date : NOV 1968

Pagination or Media Count : 52

Abstract : A method is presented for the estimation of the vector wavenumber spectrum and the directional wave spectrum of the sea surface elevation. The method assumes that an athwartship array of wave height sensors are mounted on a rapidly moving foil-borne hydrofoil vehicle and that simultaneous surface elevation records are obtained from each sensor. The estimated wave spectrum is expressed in terms of the encounter spectrum and the set of encounter cross-spectra obtained from these records. The method is evaluated by means of an artificial analytical example (without sampling variability). It appears that a wide range of wave frequencies can be resolved quite well. The basic limitation is the length of the array with respect to the longer wave lengths in the spectrum. (Author)

Descriptors :   (*HYDROFOIL CRAFT, OCEAN WAVES), (*OCEAN WAVES, MEASUREMENT), DETECTORS, FREQUENCY, RESOLUTION

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE