This dataset includes 1) A sediment grain size-shape dataset from an active aeolian system in the Dutch coastal dunes and 2) artificial grain size-shape datasets. Both were used to prove applicability of a novel method for the detection of sediment transport processes from a sedimentary deposit. The new method makes use of end-member modelling on grain size-shape distributions. The size and shape data were obtained using dynamic image analysis (video's) of sediment samples. End-member modelling was performed using AnalySize (Paterson and Heslop, 2015. DOI: https://doi.org/10.1002/2015GC006070 )The “Dune dataset” consists of sediment samples from the surface and from sediment traps. The samples were obtained from a coastal dune area south of the town Ijmuiden in the Netherlands (for coordinates of- and info on the samples, refer to Coordinates_and_info_dunedataset.xlsx).The samples were measured using dynamic image analysis. For each sediment grain in each sample, various shape variables were measured (aspect ... : Supplement to: van Hateren, Johannes Albert; van Buuren, Unze; Arens, Sebastiaan Martinus; van Balen, Ronald Theodorus; Prins, Maarten Arnoud (in review): Identifying sediment transport mechanisms from grain size-shape distributions. Earth Surface Dynamics Discussion ...