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Author: Ronald J. Lai Publisher: ISBN: Category : Ocean waves Languages : en Pages : 48
Book Description
A directional wave analysis computer program has been developed to analyze the measured directional wave data from an ENDECO Wave-Track buoy. Due to the nature of the buoy, the direction components must be adjusted in order to apply a conventional wave slope analysis. The choice of a Wave-Track buoy stems from the requirement of a light-weight, easy to handle directional sensing wave buoy. The results can be used to validate the directional spread of wave energy produced by the Spectral Ocean Wave Model (SOWM). Also, the resulting directional spread of energy, as produced by the buoy, may now be used with ship motions to produce ship response amplitude operator (RAO's), or combined with ship RAO's to estimate ship motions. The equations are developed to account for buoy motions in a current and in shallow water. Although electronic phase shifts have been adjusted, it is still necessary to develop some analytical solution to compensate for hydrodynamic responses and phase shifts. The analyzed results include frequencies, energy densities, Fourier coefficients, first and second harmonic mean wave directions and root mean square (rms) spreading. Also included is the directional spreading of energy calculated by four different methods. Results have agreed well with other wave measuring buoys as detailed in other sources. Keywords: Sea testing. (Author).
Author: Ronald J. Lai Publisher: ISBN: Category : Ocean waves Languages : en Pages : 48
Book Description
A directional wave analysis computer program has been developed to analyze the measured directional wave data from an ENDECO Wave-Track buoy. Due to the nature of the buoy, the direction components must be adjusted in order to apply a conventional wave slope analysis. The choice of a Wave-Track buoy stems from the requirement of a light-weight, easy to handle directional sensing wave buoy. The results can be used to validate the directional spread of wave energy produced by the Spectral Ocean Wave Model (SOWM). Also, the resulting directional spread of energy, as produced by the buoy, may now be used with ship motions to produce ship response amplitude operator (RAO's), or combined with ship RAO's to estimate ship motions. The equations are developed to account for buoy motions in a current and in shallow water. Although electronic phase shifts have been adjusted, it is still necessary to develop some analytical solution to compensate for hydrodynamic responses and phase shifts. The analyzed results include frequencies, energy densities, Fourier coefficients, first and second harmonic mean wave directions and root mean square (rms) spreading. Also included is the directional spreading of energy calculated by four different methods. Results have agreed well with other wave measuring buoys as detailed in other sources. Keywords: Sea testing. (Author).
Author: Robert C. Beal Publisher: ISBN: Category : Medical Languages : en Pages : 248
Book Description
Das Buch enthält insgesamt 33 Vorträge, die anlässlich des Symposiums "Measuring, Modeling, Predicting, and Applying Directional Ocean Wave Spectra" gehalten wurden, welches von 19890418 bis 19890420 am Applied Physics Laboratory der Johns Hopkins Universität stattfand. Das Symposium war den Ergebnissen des Labrador Sea Extreme Waves Experiment (LEWEX) gewidmet, welches mit internationaler Beteiligung unter Einsatz von zwei Schiffen, zwei Radar- Fernerkundungsflugzeugen sowie Radar-Fernerkundungssatelliten im März 1987 in der Labradorsee durchgeführt wurde. Ziel war die Bestimmung von richtungsbezogenen Meereswellenspektren. Nach zwei einführenden Vorträgen in das Experiment LEWEX sowie in die Bedeutung der Wellenspektren widmen sich die übrigen Fachbeiträge folgenden Themen: Physik von Wind und Wellen (Wind-Wave Physics); Seegangsverhalten und Messungen an der Meeresoberfläche (Seakeeping and Surface Measurement); Luftgestützte und weltraumgestützte Radarmessungen (Air and Space Measurement); Numerische Modellrechnungen (Numerical Model Estimates); Zukünftiger Forschungsbedarf (Future Directions). 300 der während LEWEX gemessenen 2000 Wellenspektren werden vorgestellt und verglichen.
Author: Ronald J. Lai
Author: Ronald J. Lai
Author: Robert C. Beal