Numerical Calculation of Bed Deformation in Braided Stream

Shimizu, Yasuyuki; Kurabayashi, Hiroshi; Fujita, Mutsuhiro

doi:10.2208/prohe.45.739

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Paola ͑1994, 1997͒ reproduced the spatial and temporal features of braided rivers using a relatively simple cellular numerical model in a fixed grid system. Two-dimensional numerical models have been developed to simulate braided rivers ͑Enggrob and Tjerry 1999; McArdell and Faeh 2001;Shimizu et al 2001͒. However, these models have some limitations when it comes to treating a relatively shallow, wide channel with moving boundaries due to channel widening.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Relatively Wide, Shallow Channels with Erodible Banks

2005

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A two-dimensional numerical model was developed to simulate relatively wide, shallow rivers with an erodible bed and banks composed of well-sorted, sandy materials. A moving boundary-fitted coordinate system was used to calculate water flow, bed change, and bank erosion. The cubic interpolated pseudoparticle method was used to calculate flow, which introduced little numerical diffusion. The sediment-transport equation for the streamline and transverse transport was used to estimate bed and bank evolution over time, while considering the secondary flow. Bank erosion was simulated when the gradient in the cross-sectional direction of the banks was steeper than the submerged angle of repose because of bed erosion near the banks. The numerical model reproduced the features of central bars well, such as bar growth, channel widening due to divergence of the flow around the bars, scour holes at the lee of the bars, and the increase of bar size with time. These features were in accordance with the observations for laboratory experiments. It also reproduced the features of braided rivers, such as the generation of new channels and abandonment of old channels, the bifurcation and confluence of channels, and the lateral migration of the channels. The model showed that the sediment discharge rate fluctuated with time, one of the dynamic features observed in braided channels.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Relatively Wide, Shallow Channels with Erodible Banks

2005

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Numerical Simulation of Bar Formation in Straight Channels by the NHSED2D Model

Pornprommin

Teramoto

Izumi

et al. 2002

Journal of applied mechanics

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Numerical simulations are performed to investigate the characteristics of the formation of alternate and multiple bars with the use of the NHSED2D model. The results of the simulations show reasonably good agreement with the results of the theoretical analysis and the experiments. It is found that periodic boundary conditions with an insufficiently small calculation domain tend to stabilize multiple bars. It is also found that there is possibility that different initial configurations lead to different equilibrium states. The reduction of the bar mode can be well explained by the theoretical results that the difference between the dominant modes associated with the maximum growth rate and the maximum equilibrium amplitude. The irregularity appeared in the reduction process of the bar mode is suggested to be caused by the nonlinear interaction between multiple modes of bars.

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Numerical Calculation of Bed Deformation in Braided Stream

Cited by 2 publications

References 3 publications

Numerical Simulation of Relatively Wide, Shallow Channels with Erodible Banks

Numerical Simulation of Relatively Wide, Shallow Channels with Erodible Banks

Numerical Simulation of Bar Formation in Straight Channels by the NHSED2D Model

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