Three-Dimensional Numerical Simulation and Analysis of Flows around a Submerged Weir in a Channel Bendway

Jia, Yafei; Scott, Steve; Xu, Yichun; Huang, Suiliang; Wang, Sam S. Y.

doi:10.1061/(asce)0733-9429(2005)131:8(682)

Cited by 69 publications

(26 citation statements)

References 20 publications

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“…Scour around a single submerged spur dike angled upstream in a straight channel has been studied [9]. More recently, the flow around a single submerged weir in a channel bend has been analyzed [10].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional flow in a barb field

Minor¹,

Jamieson²,

Rennie³

et al. 2007

WIT Transactions on Ecology and the Environment, Vol 104

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Barbs (or submerged groynes) are low-profile linear rock structures that are primarily used to prevent the erosion of stream banks. They are a variation of a groyne, similar to spur dikes and bendway weirs. Barbs are typically anchored, in series, to the outside bank in stream bends and extend in an upstream direction from the bank into the flow. This configuration redirects flow away from the outer stream bank and disrupts the velocity gradient close to the outer bank, encouraging sediment deposition adjacent to the barb. These interactions between the flow pattern and the sediment transport around the barb prevent erosion of the bank. Furthermore, vortices generated by the barb create local scour holes that can enhance aquatic habitat. A three-dimensional numerical model, Sediment Simulation in Intakes with Multiblock option (SSIIM), was used to examine the turbulent flow field and associated scour and depositional patterns due to a series of barbs in a mobile-bed channel bend. Previous physical model observations were used for model calibration and verification. Barb design was optimized to minimize scour. The parameters considered in the optimization were channel bend angle, barb alignment angle, and barb spacing. In this paper the spatial distribution of the three-dimensional flow field through a series of barbs in a 90º channel bend are mapped and the impact on the flow field of subtle differences in barb geometry are examined. Special emphasis is placed on the influence of barb design on secondary currents in the meander bend and the generation of three-dimensional vortices, and the consequent impact on scour.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional flow in a barb field

Minor¹,

Jamieson²,

Rennie³

et al. 2007

WIT Transactions on Ecology and the Environment, Vol 104

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“…To study the cohesive sediment transport in shallow lakes, a numerical model was developed based on CCHE3D hydrodynamic model [15,16]. CCHE3D is a three-dimensional model that can be used to simulate unsteady turbulent flows with irregular boundaries and free surfaces.…”

Section: Governing Equationsmentioning

confidence: 99%

“…In general, for the lower flow regime with low sediment concentration (lower than 300 mg/l), the decoupled approach is applicable [43,44]. In this study, the flow and sediment simulations were decoupled and the flow fields, including water elevation, velocity components, and eddy viscosity parameters were obtained using the CCHE3D free surface hydrodynamic model [15,16].…”

Section: Numerical Simulationmentioning

confidence: 99%

“…The upwinding scheme was adopted to eliminate oscillations due to advection. In the present study, a convective interpolation function [16] was used for this purpose due to its simplicity for the implicit time marching scheme which was adopted in this model to solve the unsteady equations. The numerical scheme of this approach was the second order.…”

Section: Numerical Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional numerical modeling of cohesive sediment transport and wind wave impact in a shallow oxbow lake

Chao

Jia

Shields

et al. 2008

Advances in Water Resources

Self Cite

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“…For example, HEC-RAS is a 1D model widely used to calculate watersurface profiles and energy grade lines (USACE 2001). 2D and 3D numerical models were developed to simulate sedimentation in estuaries and harbours, river morphology, bridge pier scouring, and urban flooding, such as RMA-2, FESWMS-2DH, CCHE2D/3D, SRH1D/2D, SOBEK, FLO-2D (Froehlich 1989;Norton et al 1973;O'Brien et al 1993;WL/Delft Hydraulics 1995;Jia and Wang 1999;Jia et al 2005;Chao et al 2013). The National Center for Computational Hydroscience and Engineering (NCCHE) at the University of Mississippi in the United States recently cooperated with Taiwan's WRA and National Chiao Tung University (NCTU) for CCHE2D/3D implementation in Taiwan.…”

Section: Introductionmentioning

confidence: 99%

Extreme Bed Changes in the Gaoping River Under Climate Change

Chao¹,

Li²,

Liou³

et al. 2016

Terr. Atmos. Ocean. Sci.

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Extreme typhoon events have been increasing due to climate change. In recent years, severe landslides, flooding, and extreme sediment transport have become more easily induced by these events. This study employs dynamic downscaling climate projection data to evaluate riverbed changes and sediment transport processes of the Gaoping River, located in southern Taiwan, under the worst late 20 th century conditions and projections for the late 21 st century. Results show that the peak runoff discharge in the late 21 st century could be 1.48 times larger than that in the late 20 th century. This data indicates that the risk potential for overbank and pier scour disasters will increase in the future. However, in contrast to the late 20 th century, the thalweg sediment aggradation model indicated 19% less in the late 21 st century. An experimental design method was applied to further explore the reasons behind this outKome. It was found that severe riverbed changes correlated negatively with the peak discharge in extreme floods. These findings will greatly assist in understanding riverbed change processes under extreme typhoon events using dynamic downscaling climate change data.

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Three-Dimensional Numerical Simulation and Analysis of Flows around a Submerged Weir in a Channel Bendway

Cited by 69 publications

References 20 publications

Three-dimensional flow in a barb field

Three-dimensional flow in a barb field

Three-dimensional numerical modeling of cohesive sediment transport and wind wave impact in a shallow oxbow lake

Extreme Bed Changes in the Gaoping River Under Climate Change

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