Verification of equations for incipient motion studies for a rigid rectangular channel

Bong, Charles Hin Joo; Lau, Tze Liang; Ghani, Aminuddin Ab.

doi:10.2166/wst.2012.580

Cited by 32 publications

(32 citation statements)

References 13 publications

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“…In this study, Bong et al (2013), Salem's (2013 and Shvidchenko and Pender (2000) datasets are used for estimating the Fr. Shvidchenko and Pender (2000) conducted experiments in a rectangular, glass-walled channel 8 m × 0.3 m × 0.3 m (L, W, D).…”

Section: Materials and Methods Data Collectionmentioning

confidence: 99%

“…The median diameter of particles was 1.5-4.5 mm. Bong et al (2013) carried out experiments on a rectangular channel. The discharge and flow velocity values were measured using an electromagnetic current meter.…”

Section: Materials and Methods Data Collectionmentioning

confidence: 99%

“…Salem's (2013) equations are as follows: Bong et al (2013) performed experiments in a rectangular channel keeping in view the effect of sediment deposit thickness. The median diameter of sediment (d) and specific gravity of sediment were 0.81 < d (mm) < 4.78 and 2.5 < s < 2.57 respectively.…”

Section: Overview Of Exiting Equationsmentioning

confidence: 99%

“…Therefore, several experimental research works have been conducted with a large variety of equations to estimate the incipient motion velocity (Ab Ghani et al, 1999;El-Zaemey, 1991;Novak and Nalluri, 1984;Safari et al, 2011). Some equations are applied extensively in many designs owing to their simplicity, but these equations do not consider the thickness of sediment deposited on the bed, which has significant impact on the dimensionless shear stress in the Shields diagram (Bong et al, 2013). Moreover, since the equations are regression-based their performance in different hydraulic conditions is questionable.…”

Section: Introductionmentioning

confidence: 99%

“…The main aim of this study is to develop the MLP neural network using decision trees (DT) for predicting the incipient sediment motion in rigid boundary rectangular stormwater channels by using three experimental datasets (Bong et al, 2013;Salem, 2013;Shvidchenko and Pender, 2000). The results of the MLP neural network and several regression-based equations are compared with the MLP-DT results.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Design of a new hybrid artificial neural network method based on decision trees for calculating the Froude number in rigid rectangular channels

Ebtehaj

Bonakdari

Zaji

et al. 2016

Journal of Hydrology and Hydromechanics

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A vital topic regarding the optimum and economical design of rigid boundary open channels such as sewers and drainage systems is determining the movement of sediment particles. In this study, the incipient motion of sediment is estimated using three datasets from literature, including a wide range of hydraulic parameters. Because existing equations do not consider the effect of sediment bed thickness on incipient motion estimation, this parameter is applied in this study along with the multilayer perceptron (MLP), a hybrid method based on decision trees (DT) (MLP-DT), to estimate incipient motion. According to a comparison with the observed experimental outcome, the proposed method performs well (MARE = 0.048, RMSE = 0.134, SI = 0.06, BIAS = -0.036). The performance of MLP and MLP-DT is compared with that of existing regression-based equations, and significantly higher performance over existing models is observed. Finally, an explicit expression for practical engineering is also provided.

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Section: Materials and Methods Data Collectionmentioning

confidence: 99%

Section: Materials and Methods Data Collectionmentioning

confidence: 99%

Section: Overview Of Exiting Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design of a new hybrid artificial neural network method based on decision trees for calculating the Froude number in rigid rectangular channels

Ebtehaj

Bonakdari

Zaji

et al. 2016

Journal of Hydrology and Hydromechanics

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Suspending a solid sphere in laminar inertial liquid flow—experiments and simulations

Gao

Bao

et al. 2015

AIChE Journal

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The critical conditions for the suspension of single, spherical solid particles by a liquid flow in a square container driven by a rotating disk have been determined. In the experiments, the motion of the sphere has been visualized quantitatively. The conditions are such that the flow in the container is laminar (Reynolds numbers based on the rotating disk characteristics are in the range 10 -40). The Archimedes numbers of the spheres are of order 1. The suspension process has also been numerically simulated with full resolution of the liquid flow, including the flow around the sphere, and the translational and rotational motion of the sphere. The simulations recover the critical conditions to within 3% in terms of the rotational speed of the disk. Also the sphere's trajectory in the container is reproduced well by the simulations.

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Self‐cleansing design of sewers: Definition of the optimum deposited bed thickness

Safari

Shirzad

2019

Water Environment Research

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Sediment deposits may influence the performance of the sewer systems. Sediments are the main store of pollutants which causes sewer systems overflows. In order to prevent the deposition of sediment in sewer systems, self‐cleansing design criteria are used. Among various criteria, “self‐cleansing with deposited bed” criterion is found appropriate for designing of large sewers. Allowing small thickness of deposited bed in large sewers decreases the required channel bed slope and construction costs. This study presents a bed load self‐cleansing model established on wide ranges of experimental data. Comparison of developed model with the existing models in the literature shows its higher performance on variety of data sources. Examples for the application of the model are presented, and design graphs and charts for different pipe sizes are proposed. As a result, the optimum deposited bed thickness is found 1%–5% of the pipe diameter; however, 1% is recommended for sewer pipes design. Practitioner points Nondeposition sediment transport condition with a bed deposit criterion is found appropriate for large sewer pipe design. The precision of a model is linked to the ranges of experimental data and parameters used for the models development. The optimum range of deposited bed thickness can be adopted in the range of 1% to 5% of the pipe diameter.

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Verification of equations for incipient motion studies for a rigid rectangular channel

Cited by 32 publications

References 13 publications

Design of a new hybrid artificial neural network method based on decision trees for calculating the Froude number in rigid rectangular channels

Design of a new hybrid artificial neural network method based on decision trees for calculating the Froude number in rigid rectangular channels

Suspending a solid sphere in laminar inertial liquid flow—experiments and simulations

Self‐cleansing design of sewers: Definition of the optimum deposited bed thickness

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