EasyGSH-DB: Harmonic Analysis of Water Level (FRQW)

Harmonious analysis of tides: For each place, due to the dynamic theory of tides, only the periods of partial or partial tides are known, but not their amplitude and phase. From tidal observations or numerical simulation calculations, if there are sufficiently long time series of water levels, both unknowns (amplitude and phase) can be derived. This method is called harmonic analysis of tides. The method of Harnonian analysis is a special form of fourier decomposition of a time series. If the amplitudes and phases of the partial tides of a place are known, a prediction of the water level for a given period can be made by means of harmonic synthesis of tides, i.e. summation of the partial tides. Motivation: The calculation and graphical representation of amplitude and phase of the partial tides of the water level serves to describe the system behavior in the north German coastal waters and estuaries dominated by tidal dynamics. A comparison between values derived from tidal observations and numerical model calculations for amplitude and phase of the analysed partial tides provides a qualtitatively high-quality instrument for the verification of model methods, since tidal spectra are compared to each other and thus deviations in amplitude and phase can be precisely quantified. A detailed description of the analysis modes can be found in BAWiki (http://wiki.baw.de/de/index.php/Harmonische_Analyse_des_Wasserstands). Metadata: This metadata record is considered as a parent record for the specified met data sets: — EasyGSH-DB_FRQW: M2 — Amplitude and Phase (1996-2015) Literature: — Hagen, R., et.al., (2019), Validation document — EasyGSH-DB — Part: Untrim-SediMorph-Unk, doi: https://doi.org/10.18451/k2_easygsh_1 — Freund, J., et.al., (2020), Surface analysis of numerical simulations from EasyGSH-DB, doi: https://doi.org/10.18451/k2_easygsh_fans_2 For the individual years, annual data sheets are available as a summary of the annual validation on the EasyGSH-DB (www.easygsh-db.org). For more information, please visit the project page of EasyGSH-DB (www.easygsh-db.org). English Download: The data for download can be found under References, where the data can be downloaded directly or via the web page redirection to the EasyGSH-DB portal. For further information, please refer to the download portal (https://mdi-de.baw.de/easygsh/EasyEN_index.html).