The annual zip archive files contain the sea state spectra calculated by SWAN on the one hand as energy density distribution of the one-dimensional spectrum (without directional function, so-called 1D spectrum) and on the other hand as energy density distribution of the sea state spectrum in general form (directional spectrum, so-called 2D spectrum) at selected locations along the seaward edge of the product area (DB edge). The files are direct outputs in the so-called SWAN spectrum format (see the description of the format in the appendix of the SWAN User Manual). An archive contains the 1D/2D sea state spectra over the simulation period of one year. Furthermore, the data within an archive is divided according to the location of the issue points along the “North” and “West” product area borders. The sea state spectra are sorted consecutively according to time steps and the selected output locations. The output locations (reference WGS84) are listed at the beginning of the 1D/2D sea state spectra files together with the selected discrete frequencies and, in the case of the 2D sea state spectra, also with the selected discrete wave approach directions of the sea state spectrum. The first two of a total of 21 locations on the western edge and the last two of a total of 18 locations on the northern edge do not contain any values (marked with "NODATA" in the files), as these were defined on land areas. In addition, further information such as the physical units of the output variables and the definition of an error value are listed at the beginning of a file. In the case of the 1D sea state spectrum, the output quantities and units are: energy density S (m²/Hz), mean wave onset direction Θm (degrees, nautical convention), and wave onset direction spread around the mean direction σ (also known as “spreading”, in degrees). In the case of the 2D sea state spectrum, the output quantity and unit is: energy density S (m²/Hz/degree). At the beginning of each data block of a 2D sea state spectrum, a temporally 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 (floating point number). Consequently, for further processing of the energy density, the scaling factor must be multiplied by the energy density matrix in order to output/represent the energy density as a floating point number. A spectral sea state model was created on the basis of SWAN and under the assumption of a spatially and temporally constant mean water level (NHN+0m) and without taking currents into account. The temporal simulation and output interval is one hour. The model extension and discretization (unstructured computational grid) correspond to the model parameters of the coupled Telemac-Tomawac hydrodynamic model used in EasyGSH-DB to validate the product results as part of a multi-model approach. The generated data are part of the sea state analysis in EasyGSH-DB with the aim of creating application-oriented synoptic reference data on geomorphology, sedimentology and hydrodynamics in the German Bight for a referenceable, continuously processed basic data set of 20 years for the German Bight. English Download: The data to download can be found under References ("Further 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).
