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Journal articles

Hydrodynamic and suspended sediment transport controls on river mouth morphology

Abstract : mouths building into standing bodies of water have strikingly varied growth habits. This presents a compelling pattern formation problem that is also of great practical relevance for subsurface prediction and managing coastal wetlands. Here we present a generalized 2.5-dimensional potential vorticity (PV) theory that explains sedimentation patterns of a sediment-laden stationary jet by coupling an understanding of vorticity with suspended sediment concentration fields. We explore the physical meaning of this new sediment-PV definition, and its impact on outflow depositional patterns, by analyzing data from a shallow wall-bounded plane jet experiment and by discussing new theoretical insights. A key result is that lateral advection and diffusion of suspended sediment are directly proportional to jet vorticity, a feature that reveals the mechanistic process that forms elongated channels by focused levee deposition. The new PV theory constitutes a more generalized mathematical framework that expands the Rouse theory for the equilibrium of suspended sediment.
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Submitted on : Saturday, February 19, 2022 - 10:19:55 AM
Last modification on : Monday, February 21, 2022 - 3:28:12 AM
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JGR Earth Surface - 2013 - Fal...
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F. Falcini, A. Piliouras, R. Garra, A. Guerin, D. J. Jerolmack, et al.. Hydrodynamic and suspended sediment transport controls on river mouth morphology. Journal of Geophysical Research: Earth Surface, American Geophysical Union/Wiley, 2014, 119, pp.1-11. ⟨10.1002/2013JF002831⟩. ⟨insu-03581155⟩

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