BEDFORM SEGREGATION AND LOCKING INCREASE STORAGE OF NATURAL AND SYNTHETIC PARTICLES IN RIVERS
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Date
2021
Authors
Dallmann, J.
Phillips, C. B.
Teitelbaum, Y.
Cifuentes, Edwin Y. Saavedra
Sund, N.
Schumer, R.
Arnon, S.
Packman, A. I.
Journal Title
Journal ISSN
Volume Title
Publisher
NATURE COMMUNICATIONS
Abstract
While the ecological significance of hyporheic exchange and fine particle transport in rivers is
well established, these processes are generally considered irrelevant to riverbed morpho dynamics. 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
Description
Keywords
Type of access: Open Access, hyporheic exchange, sand bedform
Citation
Dallmann, J., Phillips, C. B., Teitelbaum, Y., Saavedra Cifuentes, E. Y., Sund, N., Schumer, R., Arnon, S., & Packman, A. I. (2021). Bedform segregation and locking increase storage of natural and synthetic particles in rivers. Nature Communications, 12(1). https://doi.org/10.1038/s41467-021-27554-4