On the Quantification of the Bed Development Time of Alluvial Meandering Streams

Binns, Andrew D.; Silva, Ana Maria Ferreira da

doi:10.1061/(asce)hy.1943-7900.0000025

Cited by 15 publications

(7 citation statements)

References 16 publications

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“…Due to the short duration of the experiments, no sediment feeding was done. The effect of not-feeding sediment in the short duration experiments, only affected the upstream-end of the channel, and did not affect the morphology in the downstream sections of the stream nor the sediment transport rates determined at the channel outline (Binns & Da Silva, 2009). Thus, all experiments were done for a degrading bed.…”

Section: Methodsmentioning

confidence: 99%

Uniform and graded bed-load sediment transport in a degrading channel with non-equilibrium conditions

Khosravi

Chegini

Cooper

et al. 2020

International Journal of Sediment Research

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Methodsmentioning

confidence: 99%

Uniform and graded bed-load sediment transport in a degrading channel with non-equilibrium conditions

Khosravi

Chegini

Cooper

et al. 2020

International Journal of Sediment Research

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“…The processes discussed above were confirmed through a series of bed deformation experiments carried out in a 70° sine-generated channel (Binns and da Silva [21]). A schematic of the channel and its hydraulic circuit is shown in fig.…”

Section: Experimental Observationsmentioning

confidence: 72%

“…5a),b) show the deformed bed at t = 10 min and t = 75 min, respectively. Complete details of these experiments are given by Binns and da Silva [21,22]. Note the similarities between the schematical representation of the bed morphology in fig.…”

Section: Experimental Observationsmentioning

confidence: 94%

Bank erosion and planimetric evolution of alluvial meandering streams

Silva

Ebrahimi

2013

WIT Transactions on Ecology and the Environment

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In this paper, an attempt is made to explain why, in the absence of geological constraints, some rivers remain regular, in which case they tend to closely follow sine-generated curves, while others become irregular. The considerations rest on the present understanding of physical mechanisms determining both meandering bed deformation and bank erosion, as well as laboratory experiments carried out at Queen's University. The experimental observations suggest that the degree of erodibility of the bank plays an essential role in determining the "planimetric fate" of the stream.

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“…The meandering channel configurations are based on a series of analogue flume experiments. The experimental setup (Figure ; Table ), flow and boundary conditions, and generated topographies are described and mapped elsewhere: M low is the numerical version of experiment ME‐2 by Hasegawa (), with the resulting topography described in Ferreira da Silva and El‐Tahawy (); M med corresponds to the second run in Binns and Ferreira da Silva (); and M high represents the MB‐2 experiment described in Termini (). The ratio between bed shear stress (measured from the depth–slope product) and Shields critical shear stress ranged between 2.10 and 3.17 at the inlet (Table ).…”

Section: Methodsmentioning

confidence: 99%

Sensitivity of simulated flow fields and bathymetries in meandering channels to the choice of a morphodynamic model

Rousseau

Biron

Wiel

2016

Earth Surf Processes Landf

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Morphodynamic models are used by river practitioners and scientists to simulate geomorphic change in natural and artificial river channels. It has long been recognized that these models are sensitive to the choice of parameter values, andproper calibration is now common practice. This paper investigates the less recognized impact of the choice of the model itself. All morphodynamic models purport to simulate the same flow and sediment dynamics, often relying on the same governing equations.Yet in solving these equations, the models have different underlying assumptions, for example regarding spatial discretization, turbulence, sediment inflow, lateral friction, and bed load transport. These differences are not always considered by the average model user, who might expect similar predictions from calibrated models. Here, a series of numerical simulations in meandering channels was undertaken to test whether six morphodynamic codes (BASEMENT, CCHE-2D, NAYS, SSIIM-1, TELEMAC-2D and TELEMAC-3D) would yield significantly different equilibrium bathymetries if subjected to identical, initial flow conditions. We found that, despite producing moderately similar velocity patterns on a fixed-flat bed (regression coefficient r of 0.77 ± 0.20), the codes disagree substantially with respect to simulated bathymetries (r = 0.49 ± 0.31). We relate these discrepancies to differences in the codes' assumptions. Results were configuration specific, i.e. codes that perform well for a given channel configuration do not necessarily perform well with higher or lower sinuosity configurations. Finally, limited

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On the Quantification of the Bed Development Time of Alluvial Meandering Streams

Cited by 15 publications

References 16 publications

Uniform and graded bed-load sediment transport in a degrading channel with non-equilibrium conditions

Uniform and graded bed-load sediment transport in a degrading channel with non-equilibrium conditions

Bank erosion and planimetric evolution of alluvial meandering streams

Sensitivity of simulated flow fields and bathymetries in meandering channels to the choice of a morphodynamic model

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