Water-level oscillations in the Adriatic Sea as coherent self-oscillations inferred by independent component analysis |
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Authors: | P Capuano E De Lauro S De Martino M Falanga |
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Institution: | Dipartimento di Ingegneria Industriale, Universitá degli Studi di Salerno, via Ponte Don Melillo, 84084 Fisciano (SA), Italy |
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Abstract: | We analyze tide gauge records at four stations of the ISPRA network located in the Adriatic Sea basin (Eastern Italy), namely, going from North to South: Trieste, Ancona, Ortona and Otranto. We use linear and nonlinear methods in the frequency and time domains, including spectral and Independent Component Analysis (ICA), inter-times occurrence, and phase space embedding dimension evaluation. We show that four tidal constituents can be extracted by ICA and interpreted as coherent self-sustained oscillations. Finally, we show that these constituents can be reproduced by adopting a simple nonlinear oscillatory model that generalizes classical Andronov oscillator with the inclusion of a time dependent pumping. |
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