Application of the Variational Mode Decomposition (VMD) method to river tides
نویسندگان
چکیده
Tides in fluvial estuaries are distorted by non-stationary river discharge, which makes the analysis of estuarine water levels less accurate when using conventional tidal method. As a powerful and widely-used method for nonlinear time series, application Variational Mode Decomposition (VMD) to tides is nonexistent. This paper aims illustrate verify suitability VMD as new tool tides. The efficiency validated measurements from Columbia River Estuary. strictly divides different species into modes, thus avoids mode mixing. Compared VMD, Ensemble Empirical (EEMD), another commonly-used method, fails completely solve problem observed at Longview station decomposed 12 modes via VMD. Based on mean periods amplitudes each mode, sequentially correspond sub-tides (D0), diurnal (D1), semi-diurnal (D2), up D11 characteristics influenced discharge accurately captured without results also show that EEMD can capture subtidal signals better than nonstationary harmonic (NS_TIDE). general model be used other research purposes related tides, such detiding.
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ژورنال
عنوان ژورنال: Estuarine Coastal and Shelf Science
سال: 2021
ISSN: ['1096-0015', '0272-7714']
DOI: https://doi.org/10.1016/j.ecss.2021.107570