Nonlinear deterministic decomposition of short-crested ocean waves /
Short-crested irregular ocean surface waves are intuitively
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739667971&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Short-crested irregular ocean surface waves are intuitively modeled by the superposition of free-wave components with different frequencies and propagating in different directions. The interaction among these free-wave components may change their characteristics (amplitude, frequency. wavelength and propagating direction) and the changes are usually described as bound-waves in conventional perturbation methods [Donelan et al. 1985-- Zhang et al. 1993]. To predict the wave characteristics other than the measured or the measured values somewhere near the location where the measurements are taken., the decomposition of an irregular short-crested wave field into its free-wave components is necessary. Whereas the bound-wave components can be calculated straightforwardly if the free-wave components are known, conversely, the decomposition of resultant wave measurements into their free-wave components is much more complicated because the measurements record the resultant properties of the free-wave and bound-wave components [Long, 1986]. Decomposition of measured wave field into free-wave components is crucial to a variety of offshore and coastal engineering and environmental science applications. Based on its free-wave components, the characteristics of a related wave field, such as elevation, pressure, velocity, acceleration, and slope can be predicted. The primary objective in this study is to develop a deterministic methodology for decomposition of nonlinear short-crested irregular wave field into a characteristic set of free-wave components. The novelty of the study is that no a priori assumptions are made regarding functional or statistical properties of free-wave characteristics, such as amplitude, direction of propagation, and initial phase. In addition, there is no limit to the number of free-wave components at each frequency. This study is the first attempt of nonlinear deterministic decomposition of short-crested irregular ocean waves, based exclusively on the resultant measured records. The accuracy of the proposed methodology (DHWM) for deterministic decomposition of short-crested ocean waves was examined by means of numerical simulations and field wave data analyses. The results are highly congruent with both simulated and measured waves. |
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| Item Description: | Vita. "Major Subject: Ocean Engineering". |
| Physical Description: | xiv, 162 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 129-133. |