Accession Number : ADA329217

Title :   Ocean Wave Data Analysis Using Hilbert Transform Techniques.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Lopez, Moises N.

PDF Url : ADA329217

Report Date : DEC 1996

Pagination or Media Count : 52

Abstract : A novel technique to determine the phase velocity of long-wavelength shoaling waves is investigated. Operationally, the technique consists of three steps. First, using the Hilbert transform of a time series, the phase of the analytic signal is determined. Second, the correlations of the phases of analytic signals between two points in space are calculated and an average time of travel of the wave fronts is obtained. Third, if directional spectra are available or can be determined from time series of large array of buoys, the angular information can be used to determine the true time of travel. The phase velocity is obtained by dividing the distance between buoys by the correlation time. Using the Hilbert transform approach, there is no explicit assumption of the relation between frequency and wavenumber of waves in the wave field, indicating that it may be applicable to arbitrary wave fields, both linear and nonlinear. Limitations of the approach are discussed.

Descriptors :   *OCEAN WAVES, *INTEGRAL TRANSFORMS, SIGNAL PROCESSING, OCEAN CURRENTS, OCEAN SURFACE, TIME SERIES ANALYSIS, THESES, OCEAN BOTTOM TOPOGRAPHY, PHASE VELOCITY.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE