Abstract: In steady, fully developed flows over an erodible bed, the average bed shear stress typically governs the sediment flowrate. However, if turbulence is modified, fluctuations may become relevant to sediment transport dynamics. In this study, we conducted flume experiments with flow disturbances generated by various cylinder arrays. We performed asynchronous measurements of turbulence (LDA), shear stress (shear plate), and bedload (PTV). Our results indicate that both concentration and velocity increase with rising turbulent fluctuations at a fixed mean shear stress, with turbulence affecting concentration more strongly than velocity in sediment flowrate modeling.
Bio: Daniel Rebai is a Research Associate at the Institut für Wasser und Umwelt, Karlsruhe Institute of Technology. In 2024, he obtained his Ph.D. from the Politecnico di Milano, Italy, under the supervision of F. Ballio and A. Radice. Over the past four years, he has conducted research as a visiting student at both the Technical University of Braunschweig, Germany (working with K. Koll and J. Aberle), and the Czech Technical University in Prague (collaborating with V. Matousek). His research interests are in river hydraulics, with a focus on plastic transport, sediment transport, and scour at bridge piers.