EasyGSH-DB: Median grain diameter d50 — grid and isolines (1996, 2006, 2016)

Definition: The d50 is the equivalent grain diameter, below which, respectively, is 50 % by mass of the grains of the sediment sample. It therefore forms the median of the sediment distribution and can be used as a representative of the grain size spectrum. The d50 also serves as the basis on which further sedimentological parameters can be derived, as part of EasyGSH the porosity and the crook. Data generation: The basis for sedimentological evaluations are surface sediment samples, which were interpolated in the context of the EasyGSH project by means of anisotropic interpolation methods and taking into account hydrodynamic factors and erosion and sedimentation processes from individual samples of different years to a grid valid for one year. At each of these grid nodes, the sediment distribution is therefore available as a sum curve. For Deutsche Bucht, this basic product is available for 1996, 2006 and 2016 in a 100 m grid, for the exclusive economic zone of Germany for 1996 in a 250 m grid. Due to the monotony of the sum curves, the respective median grain diameters, the d50 values, can be determined directly. Product: 100 m grid of the German Bay (1996, 2006, 2016) and 250 m grid of the Exclusive Economic Zone (1996), where the median grain diameter d50 is deposited at each grid node. The product is provided in GeoTiff format. For this there are the isolines of the median grain diameter d50 in shapefile format. The unit of the median grain diameter d50 is given here in mm. For further information, please refer to the information portal (http://easygsh.wb.tu-harburg.de/) and the download portal (https://mdi-de.baw.de/easygsh/). 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).