Changes in Ripple Migration Rates and Hydraulic Resistance with Increasing Mud-to-Sand Ratios

Fernández, Roberto; Kassem, Hachem; Wu, Xuxu; Parsons, D.

doi:10.3850/iahr-39wc2521711920221870

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“…At C 0 = 12.3%, the growth rates were up to an order of magnitude lower at r η = 0.017 mm/min and r λ = 0.052 mm/min. Based on an equilibrium migration rate of 4–9 ripple crests/h (Fernández et al., 2022 ) and the range of ripple wavelengths of 71–132 mm, this gives a migration rate of m = 5–20 mm/min. The migration rate is at least one order of magnitude greater than the ripple height and wavelength growth rates, therefore it is justified to use Equations 7 and 8 for the transport rate of clay sediments out of the bed, as the ripples remained unchanged when moving one ripple wavelength.…”

Section: Resultsmentioning

confidence: 99%

Discontinuity in Equilibrium Wave‐Current Ripple Size and Shape and Deep Cleaning Associated With Cohesive Sand‐Clay Beds

Fernández

Parsons³

et al. 2022

JGR Earth Surface

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Ripples are primary sedimentary structures that are ubiquitous on the bed of estuaries and coastal seas. These bedforms often preserve information of the flow parameters by which they were formed (e.g., Soulsby & Clarke, 2005;Southard, 1991). Ripple-related bed roughness in turn modifies near-bed hydrodynamics and turbulence, ultimately affecting sediment fluxes, a process which is essential for the modeling of sediment transport (e.g., Soulsby, 1997;Van Rijn, 2007). Many estuarine and coastal environments face extreme weather events, which are predicted to increase in frequency with rising sea levels (e.g., Woodruff et al., 2013). Storm-induced waves combined with currents cause particularly dynamic ripple behavior and thus large and rapidly changing sediment transport rates (e.g., Li & Amos, 1999;Wengrove et al., 2018). The understanding of how hydrodynamics control ripple dimensions is therefore essential for ensuring the improved performance of coastal

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Section: Resultsmentioning

confidence: 99%