After a further literature review, ESR4 concluded that there was a need to take into account the full equation of particle motion, since for applications in the sediment transport framework, all the hydrodynamic forces play significant role spatio-temporally. Thus, within his academic secondment (02/2016-04/2016 in Université Catholique de Louvain and 05/2016 in University of Patras), he implemented the full equation of particle.