Print Email Facebook Twitter The role of wind-wave related processes in redistributing river-derived terrigenous sediments in Lake Turkana: A modelling study Title The role of wind-wave related processes in redistributing river-derived terrigenous sediments in Lake Turkana: A modelling study Author Zăinescu, Florin (Bucharest University; University of Strasbourg) van der Vegt, Helena (Deltares) Storms, J.E.A. (TU Delft Applied Geology) Nutz, Alexis (Collège de France) Bozetti, Guilherme (University of Strasbourg) May, Jan-Hendrik (University of Melbourne) Cohen, Sagy (University of Alabama) Bouchette, Frederic (Université de Montpellier) May, Simon Matthias (University of Cologne) Schuster, Mathieu (University of Strasbourg) Date 2023 Abstract A complete annual cycle of the dynamics of fine-grained sediment supplied by the Omo and smaller rivers is simulated for Lake Turkana, one of the world’s large lakes, with the hydrodynamic, wave and sediment transport model Delft3D. The model is forced with river liquid and solid discharge and wind data in order to simulate cohesive sediment transport and resuspension. It simulates stratification due to salinity, wave generation and dissipation, and sediment advection and resuspension by waves and currents, with multiple cohesive sediment fractions. A comparison of the simulation results with remotely-sensed imagery and with available in-situ sediment deposition rates validates the model. By devising simulation scenarios in which certain processes were switched on or off, we investigated the contribution of waves, wind-induced surface and bottom currents, salinity-induced stratification and river jet, in resuspending and transporting fine sediments in the lake basin. With only the wind or river influence, most of the sediment deposition occurs in the first 10 km off the Omo River mouth and at a depth 30 m. This study sheds new light on sediment transport in Lake Turkana and in great lakes in general, favouring the view that wind-waves can be the main agent that transports sediment away from river mouths and to deeper areas, as opposed to river-plume or gravity-driven transport. Subject HydrodynamicsSedimentationDelft3DWaveResuspensionLake Turkana To reference this document use: http://resolver.tudelft.nl/uuid:ffbe65ab-41ac-40e4-b57f-b345983bd3e4 DOI https://doi.org/10.1016/j.jglr.2022.12.013 ISSN 0380-1330 Source Journal of Great Lakes Research, 49 (2), 368-386 Part of collection Institutional Repository Document type journal article Rights © 2023 Florin Zăinescu, Helena van der Vegt, J.E.A. Storms, Alexis Nutz, Guilherme Bozetti, Jan-Hendrik May, Sagy Cohen, Frederic Bouchette, Simon Matthias May, Mathieu Schuster Files PDF 1_s2.0_S0380133022002726_main.pdf 6.68 MB Close viewer /islandora/object/uuid:ffbe65ab-41ac-40e4-b57f-b345983bd3e4/datastream/OBJ/view