Articles | Volume 11, issue 4
https://doi.org/10.5194/esurf-11-575-2023
https://doi.org/10.5194/esurf-11-575-2023
Research article
 | 
11 Jul 2023
Research article |  | 11 Jul 2023

The influence of dune lee side shape on time-averaged velocities and turbulence

Alice Lefebvre and Julia Cisneros

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Experimental Study of Time-Averaged Flow and Turbulence Structures over Low-Angle Tidal Dunes under Steady Bidirectional Flows
Kevin Bobiles, Bernhard Kondziella, Christina Carstensen, Elda Miramontes, Ingrid Holzwarth, and Alice Lefebvre
EGUsphere, https://doi.org/10.5194/egusphere-2025-4883,https://doi.org/10.5194/egusphere-2025-4883, 2025
This preprint is open for discussion and under review for Earth Surface Dynamics (ESurf).
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Cited articles

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Bennett, S. J. and Best, J. L.: Mean flow and turbulence structure over fixed, two-dimensional dunes: implications for sediment transport and bedform stability, Sedimentology, 42, 491–513, https://doi.org/10.1111/j.1365-3091.1995.tb00386.x, 1995. 
Best, J.: The fluid dynamics of river dunes: A review and some future research directions, J. Geophys. Res., 110, F04S02, https://doi.org/10.1029/2004JF000218, 2005. 
Best, J. and Kostaschuk, R.: An experimental study of turbulent flow over a low-angle dune, J. Geophys. Res., 107, 3135, https://doi.org/10.1029/2000JC000294, 2002. 
Bradley, R. W. and Venditti, J. G.: Reevaluating dune scaling relations, Earth-Sci. Rev., 165, 356–376, https://doi.org/10.1016/j.earscirev.2016.11.004, 2017. 
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Short summary
Underwater dunes are found in various environments with strong hydrodynamics and sandy sediment. Using a numerical model, we investigated how the dune shape influences flow velocity and turbulence. We propose a classification with three types of dunes, depending on their mean lee side angles (low-angle dunes, intermediate-angle dunes and high-angle dunes). We discuss the implications of this classification on the interaction between dune morphology, flow and sediment transport.
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