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      Continuous Wavelet Transform Analysis of Acceleration Signals Measured from a Wave Buoy

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          Abstract

          Accelerometers, which can be installed inside a floating platform on the sea, are among the most commonly used sensors for operational ocean wave measurements. To examine the non-stationary features of ocean waves, this study was conducted to derive a wavelet spectrum of ocean waves and to synthesize sea surface elevations from vertical acceleration signals of a wave buoy through the continuous wavelet transform theory. The short-time wave features can be revealed by simultaneously examining the wavelet spectrum and the synthetic sea surface elevations. The in situ wave signals were applied to verify the practicality of the wavelet-based algorithm. We confirm that the spectral leakage and the noise at very-low-frequency bins influenced the accuracies of the estimated wavelet spectrum and the synthetic sea surface elevations. The appropriate thresholds of these two factors were explored. To study the short-time wave features from the wave records, the acceleration signals recorded from an accelerometer inside a discus wave buoy are analysed. The results from the wavelet spectrum show the evidence of short-time nonlinear wave events. Our study also reveals that more surface profiles with higher vertical asymmetry can be found from short-time nonlinear wave with stronger harmonic spectral peak. Finally, we conclude that the algorithms of continuous wavelet transform are practical for revealing the short-time wave features of the buoy acceleration signals.

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          Most cited references 52

          • Record: found
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          Wavelets and signal processing

           O. Rioul,  M. Vetterli (1991)
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            Wavelet analysis for geophysical applications

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              • Record: found
              • Abstract: not found
              • Article: not found

              Observations of bispectra of shoaling surface gravity waves

               Steve Elgar,  R. Guza (1985)
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                Author and article information

                Journal
                Sensors (Basel)
                Sensors (Basel)
                Sensors (Basel, Switzerland)
                Molecular Diversity Preservation International (MDPI)
                1424-8220
                August 2013
                19 August 2013
                : 13
                : 8
                : 10908-10930
                Affiliations
                [1 ] Institute of Ocean Technology and Marine Affairs, National Cheng Kung University, 1, Da-Hsueh Rd., Tainan 70101, Taiwan; E-Mail: zsuhsin@ 123456mail.ncku.edu.tw
                [2 ] Coastal Ocean Monitoring Center, National Cheng Kung University, 1, Da-Hsueh Rd., Tainan 70101, Taiwan
                [3 ] Water Resources Agency, Ministry of Economic Affairs, 9-12F, 41-3 Sec.3 Hsin-Yi Rd., Taipei 10651, Taiwan; E-Mail: coa1234s@ 123456yahoo.com.tw
                Author notes
                [* ] Author to whom correspondence should be addressed; E-Mail: jackalson18@ 123456gmail.com ; Tel.: +886-6-274-4058 (ext. 34).
                Article
                sensors-13-10908
                10.3390/s130810908
                3812634
                23966188
                © 2013 by the authors; licensee MDPI, Basel, Switzerland.

                This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).

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