Numerical Calculation of Bed Deformation in Braided Stream With Emerged Mid-Channel Bars

Kurabayashi, Hiroshi; Shimizu, Yasuyuki

doi:10.2208/prohe.46.743

Cited by 4 publications

(1 citation statement)

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“…For example, two-dimensional and three-dimensional computational fluid dynamics models have been used to simulate flow hydraulics both at the scale of the bar-pool unit (Lane et al, 1999;Nicholas & Sambrook Smith, 1999;Bradbrook et al, 2001;Nicholas, 2005) and the larger reach-scale (Nicholas, 2003). Recently, such approaches have also been coupled with bedload transport models to simulate the initiation and evolution of braided channel morphology (McArdell & Faeh, 2001;Kurabayashi et al, 2002;Shimizu, 2002). These approaches offer the prospect of providing an improved physically based understanding of process-form interactions within braided rivers, albeit over relatively short temporal and spatial scales.…”

Section: Introductionmentioning

confidence: 99%

Cellular Modelling of Braided River form and Process

2006

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Cellular approaches to modelling fluvial processes typically implement simplified rules describing water and sediment routing and have, in the past, been used to provide qualitative insight into fundamental aspects of braided river behaviour. A new cellular model of flow, sediment transport and vegetation effects is presented here and used to simulate the formation and evolution of braided rivers over periods of up to 200 yr. Through comparison with field data and the results of a more sophisticated hydraulic model, which solves the shallow-water equations, the cellular model is shown to generate accurate predictions of inundation extent, spatial patterns of unit discharge and flow routing pathways. The coupled flow-sediment-vegetation model is also shown to replicate many of the static characteristics of braided river morphology and dynamic aspects of channel behaviour. These results illustrate that cellular approaches may have considerable potential as tools for simulating river behaviour over periods of 100 yr or longer. However, in order to fulfil this potential it is necessary to develop approaches that emphasize both simplicity and quantitative accuracy, at least where the two are not mutually exclusive.

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Section: Introductionmentioning

confidence: 99%

Cellular Modelling of Braided River form and Process

2006

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Sandbars in alluvial channels: their formation processes and interaction with groins

Alauddin

Tsujimoto

2014

World Journal of Engineering

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Large sandbars resulted from the instability of loose sedimentary materials are very common in lowland rivers. These, not only, interrupt the inland waterways at low flow, but also make the channels highly unstable forming anabranches, influencing bank erosion, and so on. Groins have key roles to play in such cases. Formation processes of sandbars and their interactions with groins become very urgent to learn for better management of river engineering. RIC-Nays, a two-dimensional model for flow and morphology, is utilized in this study. Computation results reveal that different initial conditions lead to different equilibrium states, and periodic boundary conditions with a small computation domain tend to stabilize multiple bars. Intrusion of groins accelerates the flow in the main channel, which triggers the sediment movement there. Thus the bars move downstream reducing their scale and finally they disappear from the main channel.

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