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Application of Hilbert-Huang decomposition to temperature and currents data in the Réunion island ArchiMer
Kbaier-ben Ismail, Dhouha; Lazure, Pascal; Puillat Felix, Ingrid.
In marine sciences, time series are often nonlinear and nonstationary. Their analysis faces new challenges and thus requires the implementation of adequate and specific methods. We use the Hilbert-Huang Transform (HHT) for the spectral analysis of high frequency sampled time series in near shore waters of the Réunion island, located in the Indian Ocean 700 km east of Madagascar. We focus particularly on automatic measurements of sea level fluctuations, temperature records and current data sets at four different stations in the island. We look at the contribution of different Intrinsic Mode Functions (IMFs) obtained by the Empirical Mode Decomposition (EMD) and also compare the Hilbert spectra with the wavelet spectra. The inertial wave and several...
Tipo: Text Palavras-chave: Cross correlation; Empirical mode decomposition (EMD); Hilbert spectral analysis (HSA); Hilbert-Huang transform (HHT); Stationarity; Time-dependent intrinsic correlation (TDIC); Time series; Wavelets.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00383/49392/49822.pdf
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Propriétés statistiques de la température, salinité et turbidité mesurées par la station MAREL Carnot dans les eaux côtières de Boulogne-sur-Mer (France) ArchiMer
Kbaier-ben Ismail, Dhouha; Puillat, Ingrid; Lazure, Pascal.
Dans l’environnement marin, la température, la turbidité et la salinité sont des quantités importantes pour étudier l’écosystème. Beaucoup de champs montrent la haute variabilité pour une large gamme d'échelles spatiale et temporelle. Les séries temporelles sont souvent non-linéaires et non-stationnaires. Les auteurs considèrent ici les fluctuations du niveau de la mer, la salinité, la turbidité et la température enregistrés par le système MAREL Carnot de Boulogne-sur-Mer (France), qui est une bouée amarrée équipée d'appareils de mesure physicochimiques, qui fonctionnent dans des conditions continues et autonomes. Pour réaliser des analyses statistiques et spectrales adéquates, il est nécessaire de connaître la nature de la série temporelle considérée....
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00270/38076/36202.pdf
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Time-frequency analysis of currents data sampled at four stations in the Réunion island: application of EMD and wavelets ArchiMer
Kbaier-ben Ismail, Dhouha; Lazure, Pascal; Puillat, Ingrid.
Abstract. We consider the statistical analysis of high frequency sampled time series in nearshore waters of the Réunion island, located in the Indian Ocean 700 km east of Madagascar. We focus particularly on automatic measurements of current data sets at four different stations in the island. As this entire dataset is characterized by non-linearity and non-stationarity, two time-frequency decomposition methods, namely wavelets and Hilbert-Huang Transformation (HHT), are applied for the analysis of the entire dataset. Using the Continuous Wavelet Transform (CWT), some properties of the currents time series are determined. Then, the inertial wave and several low-frequency tidal waves are identified by the application of the Empirical Mode Decomposition (EMD)...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00270/38078/36206.pdf
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