Bedform segregation and locking increase storage of natural and synthetic particles in rivers

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Jonathan Dallmann, Colin Phillips, Yoni Teitelbaum , Edwin Saavedra Cifuentes, Nicole Sund , Rina Schumer , Shai Arnon , Aaron Packman


While the ecological significance of hyporheic exchange and fine particle transport in rivers is well established, these processes are generally considered irrelevant to riverbed morphodynamics. We show that coupling between hyporheic exchange, suspended sediment deposition, and sand bedform motion strongly modulates morphodynamics and sorts bed sediments. Hyporheic exchange focuses fine-particle deposition within and below mobile bedforms, which suppresses bed mobility. However, deposited fines are also remobilized by bedform motion, providing a mechanism for segregating coarse and fine particles in the bed. Surprisingly, two distinct end states emerge from the competing interplay of bed stabilization and remobilization: a locked state in which fine particle deposition completely stabilizes the bed, and a dynamic equilibrium in which frequent remobilization sorts the bed and restores mobility. These findings demonstrate the significance of hyporheic exchange to riverbed morphodynamics and clarify how dynamic interactions between coarse and fine particles produce sedimentary patterns commonly found in rivers





Dunes, Cohesion, Riverbeds, Fine Particles


Published: 2021-09-24 09:16

Last Updated: 2021-09-24 13:16


CC BY Attribution 4.0 International

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I will publically share the data when the paper is officially published (under Review with Nat Comm)

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