2014
DOI: 10.1002/2014jf003158
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Wavelength selection and symmetry breaking in orbital wave ripples

Abstract: Sand ripples formed by waves have a uniform wavelength while at equilibrium and develop defects while adjusting to changes in the flow. These patterns arise from the interaction of the flow with the bed topography, but the specific mechanisms have not been fully explained. We use numerical flow models and laboratory wave tank experiments to explore the origins of these patterns. The wavelength of "orbital" wave ripples (λ) is directly proportional to the oscillating flow's orbital diameter (d), with many exper… Show more

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Cited by 28 publications
(31 citation statements)
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“…The evolution from larger to smaller ripples started with crests splitting into two, thus initiating the decrease of the ripple length. Nienhuis et al (2014) presented a combined experimental/numerical study in which they conducted morphodynamic experiments in a laboratory wave flume, first generating ripples at an equilibrium state, and then abruptly changing a o to observe their evolution. The numerical part of this work was based on the lattice Boltzmann method, to take advantage of the easy implementation of geometrical irregular boundaries and computation of the stresses over the observed beds.…”
Section: Transient Bedform Defectsmentioning
confidence: 99%
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“…The evolution from larger to smaller ripples started with crests splitting into two, thus initiating the decrease of the ripple length. Nienhuis et al (2014) presented a combined experimental/numerical study in which they conducted morphodynamic experiments in a laboratory wave flume, first generating ripples at an equilibrium state, and then abruptly changing a o to observe their evolution. The numerical part of this work was based on the lattice Boltzmann method, to take advantage of the easy implementation of geometrical irregular boundaries and computation of the stresses over the observed beds.…”
Section: Transient Bedform Defectsmentioning
confidence: 99%
“…The overall procedure for the latter case lasted longer (~10,000 waves) than the former one. Nienhuis et al, 2014). Perron et al (2018) presented morphodynamic analysis from the same laboratory wave flume experiments as Nienhuis et al (2014).…”
Section: Transient Bedform Defectsmentioning
confidence: 99%
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“…There are simply too many parameters in reactive transport models, and this only multiplies when the temperature dependence of these parameters is considered. Thus, the next years should see the strong link between field and laboratory experimentation using novel observational methods (e.g., planar optodes and microsensors) [ Cook et al ., ; Glud , ; Glud et al ., ; Kessler et al ., ; Kessler et al ., ], reactive tracers (e.g., resazurin) [ Haggerty et al ., , ], high‐precision and high‐throughput instream water quality sensors [ Kirchner et al ., ; Lemke et al ., ], and even more flexible and efficient multiphysics modeling approaches (e.g., cellular automata or lattice Boltzmann methods) [ Nienhuis et al ., ; Parmigiani et al ., ]. One difficulty that aquatic ecologists and biogeochemists continually face is the diversity and complexity of organic carbon.…”
Section: Prospect For the Futurementioning
confidence: 99%