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Author: Li-hwa Lin Publisher: ISBN: Category : Ocean waves Languages : en Pages : 408
Book Description
Directional wave spectra have been estimated in this study based upon simultaneous subsurface measurements of current and pressure. Two previously developed methods, the stochastic and deterministic approaches, have been reviewed and restudied. It is demonstrated by means of the Correlation Theorem that the stochastic and deterministic approaches are, under certain conditions, identical. In order to improve directional spectrum results obtained from the combined stochastic/deterministic approach, a new method, the geometric approach, has been developed as part of this research effort. The geometric approach matches Fourier transformed wave properties to frequency dependent wavelet pairs in each frequency interval. The amplitude, direction and phase of each wavelet are uniquely specified by equating kinematic and dynamic properties for each frequency component. Wavelets evaluated in each frequency interval do not have an artificially imposed phase constraint in the geometric approach as they have in the stochastic/deterministic approach, providing a more realistic model to represent the directional properties of ocean random waves. This study shows that the geometric approach provides more reliable predictions of the water surface one-dimensional spectra as well as directional spectra. Finally, some semi-empirical equations are proposed and combined to represent the directional spectrum model. A least square error minimization analysis is used to quantify empirical equation parameters. The resulting directional spectra obtained from alternative methods are compared based on either real ocean data or computer simulated data.
Author: Li-hwa Lin Publisher: ISBN: Category : Ocean waves Languages : en Pages : 408
Book Description
Directional wave spectra have been estimated in this study based upon simultaneous subsurface measurements of current and pressure. Two previously developed methods, the stochastic and deterministic approaches, have been reviewed and restudied. It is demonstrated by means of the Correlation Theorem that the stochastic and deterministic approaches are, under certain conditions, identical. In order to improve directional spectrum results obtained from the combined stochastic/deterministic approach, a new method, the geometric approach, has been developed as part of this research effort. The geometric approach matches Fourier transformed wave properties to frequency dependent wavelet pairs in each frequency interval. The amplitude, direction and phase of each wavelet are uniquely specified by equating kinematic and dynamic properties for each frequency component. Wavelets evaluated in each frequency interval do not have an artificially imposed phase constraint in the geometric approach as they have in the stochastic/deterministic approach, providing a more realistic model to represent the directional properties of ocean random waves. This study shows that the geometric approach provides more reliable predictions of the water surface one-dimensional spectra as well as directional spectra. Finally, some semi-empirical equations are proposed and combined to represent the directional spectrum model. A least square error minimization analysis is used to quantify empirical equation parameters. The resulting directional spectra obtained from alternative methods are compared based on either real ocean data or computer simulated data.
Author: Carl M. Bennett Publisher: ISBN: Category : Ocean waves Languages : en Pages : 102
Book Description
An introductory discussion of the mathematics behind the directional analysis of ocean waves is presented. There is sufficient detail for a reader interested in applying the methods; further, the report can serve as an entry into the theory. The presentation is basically tutorial but does require a reasonably advanced mathematical background. Results of a program for the measurement of directional ocean wave bottom pressure spectra are included as an appendix. This second edition makes corrections to the first and adds some details of an iterative directional analysis method. (Author).
Author: Orville T. Magoon Publisher: ISBN: Category : Science Languages : en Pages : 1080
Book Description
Proceedings of the Second International Symposium on Ocean Wave Measurement and Analysis, held in New Orleans, Louisiana, July 25-28, 1993. Sponsored by the Waterways, Port, Coastal and Ocean Division of ASCE. This collection, which honors Professor Robert L. Wiegel, contains 79 papers that explore major advances in wave measurement and quantification of ocean and lake waves, including technical knowledge and applications on wave theory, characteristics, design and techniques. Papers are both national and international in scope and include practical examples and case histories. Topics include: wave transformation, data analysis and reliability, wave modeling, applications, long waves, extreme wave statistics, and other topics relating to wave research over the last two decades. This collection will serve as a primary reference to the latest information in the field of wave measurement and analysis for anyone working with coastal technology.
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: Li-hwa Lin
Author: Li-hwa Lin
Author: Carl M. Bennett
Author: Orville T. Magoon
Author: Robert C. Beal
Author: D. Karunakaran
Author: COST Action 714
Author: Marshall Delph Earle
Author: Mohammad Asmatullah Khalid
Author: Robert L. Wiegel
Author: James Cheng Liu