Investigation of vertical size segregation in bedload sediment transport with a coupled fluid-discrete element modelPhilippe Frey, Raphaël Maurin, Lamia Morchid-Alaoui, Shashank Gupta and Julien ChauchatEPJ Web Conf., 140 (2017) 09025DOI: https://doi.org/10.1051/epjconf/201714009025