EasyGSH-DB_WAVS: Station-related 1D and 2D sea gang spectra (1996-2015)

The annual zip archive files contain the sea gang spectra calculated by SWAN on the one hand as energy density distribution of the one-dimensional spectrum (without direction function, so-called 1D spectrum) and on the other hand as the energy density distribution of the seagoing spectrum in general form (direction spectrum, so-called 2D spectrum) at selected locations along the seaside edge of the product area (DB edge). The files are direct outputs in the so-called SWAN spectra format (see description of the format attached to the SWAN User Manual). An archive contains the 1D/2D seagoing spectra over the simulation period of one year. Furthermore, the data within an archive are divided according to the location of the output points along the edge of the product area “North” and “West”. The seagoing spectra are continuously sorted by time steps and by the selected output locations. The output locations (location reference WGS84) are listed at the beginning of the 1D/2D seagoing spectra together with the selected discrete frequencies and in the case of the 2D seagoing spectra additionally with the selected discrete wave starting directions of the seagoing spectrum. The first two of the 21 locations on the western edge and the last two of the 18 locations on the northern edge do not contain values (marked by “NODATA” in the files) as they were defined on land. In addition, further information such as the physical units of the output sizes and the definition of an error value are listed at the beginning of a file. In the case of the 1D seagoing spectrum, the output sizes and units are: Energy density S (m²/Hz), mean wave start-up direction (degree, nautical convention) and dispersion of the wave start direction around the middle direction (also referred to as “spreading”, in degrees). In the case of the 2D seagoing spectrum, the output size and unit is: Energy density S (m²/Hz/degree). At the beginning of each data block of a 2D seagoing spectrum, a temporal and spatially variable scaling factor is also listed, which is used to convert the energy density from the data type Integer (whole number) to the data type Float (float number). Consequently, in order to further process the energy density, the scaling factor must be multiplied by the matrix of the energy density to output/represent the energy density as floating point number. A spectral seagoing model based on SWAN and assuming a spatially and temporally constant mean water level (NHN+ 0 m) and without considering currents was created. The time simulation and output interval is one hour. The model expansion and discretisation (unstructured computational grid) correspond to the model parameters of the coupled hydrodynamic Telemac-Tomawac model used in EasyGSH-DB to validate product results as part of a multi-model approach. The generated data are part of the seagoing analyses in EasyGSH-DB with the aim of creating application-oriented synoptic reference data on geomorphology, sedimentology and hydrodynamics in the German Bay for a referenceable, continuously processed basic data set of 20 years for Deutsche Bucht. English Download: The data to 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).