Boundary shear stress in open channel flow: A comparison among six methods

Khodashenas, Saeed Reza; Abderrezzak, Kamal El Kadi; Paquier, André

doi:10.3826/jhr.2008.3203

Cited by 33 publications

(12 citation statements)

References 27 publications

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“…However, Lundgren and Jonsson [1964] recognized that the concept of “flow depth” is not valid, particularly if the side slope is steep. Also, Khodashenas et al [2008] showed that this approach generates large errors even for flows in open prismatic channels with trapezoidal cross‐sectional geometry. Alternatively, Khodashenas and Paquier [1999] proposed a geometrical method to compute the boundary shear stress distribution in open channels with an irregular cross‐sectional geometry.…”

Section: Sediment Modeling Systemmentioning

confidence: 99%

One‐dimensional numerical modeling of sediment transport and bed deformation in open channels

Abderrezzak¹,

Paquier²

2009

Water Resources Research

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[1] A one-dimensional numerical model for simulating unsteady flow and sediment transport in open channels is presented and tested. The flow hydrodynamics is represented by the shallow water equations, and the bed morphodynamics is represented by the Exner equation and an additional equation describing the nonequilibrium sediment transport. Sediment size distribution is represented by the median grain diameter and the standard deviation, instead of the usual modeling with multiple particle size classes. Various methods for computing bed elevation changes at a cross section due to erosion or deposition of sediment are proposed and tested, including an innovative approach that relates the spatial pattern of erosion and deposition rates to boundary shear stress distribution, which is calculated by the Merged Perpendicular Method. An explicit finite difference scheme is employed for solving the water and sediment governing equations. The pertinence of the model is examined for two hypothetical cases. The model is then tested on one set of laboratory experiments on bed degradation under steady flow, showing excellent model data fit, and indicating that incorporating a nonequilibrium sediment transport equation into the model structure is an important element in reproducing the bed degradation process. Finally, the model is applied to simulate the morphological changes taking place in the Ha!Ha! River (Quebec) after the failure of the Ha!Ha! Dyke on July 1996. Relevant results can be obtained in terms of changes in longitudinal bed profile and cross-sectional geometry as well as water levels, although some discrepancies are obtained between the simulated and surveyed cross-sectional geometries, mainly because bank failure and channel widening are not modeled.

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Section: Sediment Modeling Systemmentioning

confidence: 99%

One‐dimensional numerical modeling of sediment transport and bed deformation in open channels

Abderrezzak¹,

Paquier²

2009

Water Resources Research

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“…For each region, the hydraulic radius is estimated as the ratio between the wetted area and the wetted perimeter. Khodashenas et al (2008) performed a comparison among several analytical methods for computing the τ distribution and laboratory data for several channel shapes (rectangular, trapezoidal, and compound) and roughness. They came to the conclusion that analytical methods similar to the one used in BSTEM provide a suitable estimation of the τ distribution, except near corners and at the edge of the cross-section.…”

Section: Modeling Fluvial Erosionmentioning

confidence: 99%

Evaluating a process‐based model for use in streambank stabilization: insights on the Bank Stability and Toe Erosion Model (BSTEM)

Klavon

Fox

Guertault

et al. 2016

Earth Surf Processes Landf

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Streambank retreat is a complex cyclical process involving subaerial processes, fluvial erosion, seepage erosion, and geotechnical failures and is driven by several soil properties that themselves are temporally and spatially variable. Therefore, it can be extremely challenging to predict and model the erosion and consequent retreat of streambanks. However, modeling streambank retreat has many important applications, including the design and assessment of mitigation strategies for stream revitalization and stabilization. In order to highlight the current complexities of modeling streambank retreat and to suggest future research areas, this paper reviewed one of the most comprehensive streambank retreat models available, the Bank Stability and Toe Erosion Model (BSTEM), which has recently been integrated with several popular hydrodynamic and sediment transport models including the Hydrologic Engineering Centerˈs River Analysis System (HEC-RAS). The objectives of this paper were to: (i) comprehensively review studies that have utilized BSTEM and report their findings, (ii) address the limitations of the model so that it can be applied appropriately in its current form, and (iii) suggest directions of research that will help make the model a more useful tool in future applications. The paper includes an extensive overview of peer reviewed studies to guide future users of BSTEM. The review demonstrated that the model needs further testing and evaluation outside of the central United States. Also, further development is needed in terms of accounting for spatial and temporal variability in geotechnical and fluvial erodibility parameters, incorporating subaerial processes, and accounting for the influence of riparian vegetation on streambank pore-water pressure dynamics, applied shear stress, and erodibility parameters.

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“…Hydraulics shows that the erosion of the earthen channels is a direct function of the shear stress distribution on the wetted perimeter, which varies with the geometric shape (Depeweg et al 2015, Dey 2014, Khodashenas et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Contribution to runoff erosion of earthen channels

Haddad

Bouhadef

2018

pjss

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12Abstract. The purpose of the experimental study is to investigate the effect of earthen channel geometry on erosion by runoff. After the construction of an experimental setup, four geometric shapes were tested; the circle, the triangle, the sinus and the trapeze. These four forms were dug in agricultural sandy-loam soil. For all experiments, and for each geometric shape, discharge, slope inclination, time, and slope length were varied. Experimental results have shown that the geometry of earthen channels plays an important role in sedimentary dynamics. In addition, it was noted that for slopes less than 20%, the sinusoidal geometric shape allowed to have the minimum of sediment exported. For upper slopes, the minimum amount of soil exported, was obtained with the triangle. The analysis of the experimental results allowed us to see that the variation of the mass of soil exported as a function of the discharge, the slope inclination, the time and the slope length, followed power functions with respective exponents of 2.49, 0.88, -1.27, and -1.53.

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Boundary shear stress in open channel flow: A comparison among six methods

Cited by 33 publications

References 27 publications

One‐dimensional numerical modeling of sediment transport and bed deformation in open channels

One‐dimensional numerical modeling of sediment transport and bed deformation in open channels

Evaluating a process‐based model for use in streambank stabilization: insights on the Bank Stability and Toe Erosion Model (BSTEM)

Contribution to runoff erosion of earthen channels

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