Chapter
Dec 31, 2015
Non-Stationary Spectrum Analysis of Ocean Waves
Publication: Coastal Engineering 1972
Abstract
Priestley's method [1, 2, 3]** of non-stationary spectral analysis is extended to the case of digitally sampled records. A computation procedure previously proposed in an earlier work [4] is further investigated. This procedure compensates for the inherent difficulties in the theory and computes time-dependent spectra from a sample in an iterative manner. Validities of the theory and the iterative procedure are tested with a simulated non-stationary process. Results establish a general agreement with theory, especially when spectra vary smoothly with time and frequency. Consequently, the procedure is applied to estimate non-stationary spectra for two wave records. A comparison is made between the non-stationary estimates and the stationary results derived from the same set of wave records.
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© 1973 American Society of Civil Engineers.
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Published online: Dec 31, 2015
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Mehmet Aziz Tayfun
Research Fellow of Civil Engineering, Professor of Civil Engineering and Assistant Professor of Mathematics, respectively; University of Delaware, Newark, Delaware, 19711.
Cheng Yi Yang
Research Fellow of Civil Engineering, Professor of Civil Engineering and Assistant Professor of Mathematics, respectively; University of Delaware, Newark, Delaware, 19711.
George Chia-Chu Hsiao
Research Fellow of Civil Engineering, Professor of Civil Engineering and Assistant Professor of Mathematics, respectively; University of Delaware, Newark, Delaware, 19711.
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