Numerical prediction of morphological change of straight trapezoidal open-channel

Choi, Sung-Uk; Joung, Younghoon

doi:10.1016/j.jher.2012.01.003

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…Darby and Thorne () applied the LDM to the Severn River in the United Kingdom and reproduced the stage‐discharge relationship successfully. Choi and Joung () applied the same method to a laboratory‐scale trapezoidal channel flow and found that the method predicts the depth‐averaged velocity accurately through comparisons with measured data. Choi and Lee () applied the LDM to predicting sediment transport in a river and successfully reproduced the lateral variation in the sediment load.…”

Section: Prediction Of Total Sediment Loadmentioning

confidence: 99%

Prediction of Total Sediment Load in Sand‐Bed Rivers in Korea Using Lateral Distribution Method

Choi

Lee

2014

J American Water Resour Assoc

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A new method for numerically predicting the total sediment load in a river is proposed. The method can be used to predict the total sediment load with information on channel geometry and slope, flow, and bed materials. The conventional method uses a 1D approach that assumes the channel has a wide rectangular shape. However, the proposed method computes depth‐averaged velocity over the width and predicts the total sediment load based on the flow computations. The new method, therefore, is expected to predict better if the flow changes significantly in the lateral direction. The proposed method was applied to three large sand‐bed rivers in Korea, where information is available regarding suspended sediment. Five formulas were tested of use in making total sediment load computations, namely Engelund‐Hansen's, Ackers‐White's, Yang's, Brownlie's, and Karim's formulas. The predicted total sediment loads are compared not only with measured data but also with results calculated using the 1D approach. Discrepancy ratios between the predicted and measured total sediment loads are given and the results are discussed.

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Section: Prediction Of Total Sediment Loadmentioning

confidence: 99%

Prediction of Total Sediment Load in Sand‐Bed Rivers in Korea Using Lateral Distribution Method

Choi

Lee

2014

J American Water Resour Assoc

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“…Ikeda's experiment was used by various authors to validate mathematical and numerical models on equilibrium channels based on a cross-sectional approach [11][12][13][14][15]. These approaches are based on the same equations as adopted in the presented numerical model.…”

Section: Comparison With Numerical Models From the Literaturementioning

confidence: 99%

“…These approaches are based on the same equations as adopted in the presented numerical model. However, they neglect longitudinal variations to reduce the complexity and focus on a single cross-section [15]. 2D models should be able to reproduce lateral erosion processes taking longitudinal variation into account, such as for natural rivers.…”

Section: Comparison With Numerical Models From the Literaturementioning

confidence: 99%

“…Various numerical models based on a cross-sectional approach have been proposed in the literature to compare to Ikeda's experimental data (e.g., [11][12][13][14][15]). Thereby, the main uncertainties were related to the appropriate choice of the the angle of repose, the Ikeda parameter, the bed load formula [11] and the critical Shields stress [13].…”

Section: Introductionmentioning

confidence: 99%

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Modeling Streambank and Artificial Gravel Deposit Erosion for Sediment Replenishment

Vonwiller

Vetsch

Boes

2018

Water

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Sediment replenishment by artificial gravel deposits is a measure to increase sediment supply in gravel-bed rivers. Thereby, streambank erosion is the dominant process for gravel entrainment. In this contribution, we quantitatively validate a numerical morphodynamic 2D model and the relevant model approaches to reproduce non-cohesive streambank erosion. Therefore, a calibration and a sensitivity analysis of the relevant model approaches and parameters are carried out based on a reference laboratory experiment on streambank erosion in a straight channel from the literature. The relevant model approaches identified to successfully reproduce lateral streambank erosion are the gravitational bank collapse, the lateral bed slope effect on the bed load transport direction and the local bed slope effect on the critical Shields stress. Based on these findings, the numerical model was compared against data from laboratory experiments on gravel deposit erosion. Thereby, the focus was on the influence of the hydraulic discharge, the grain size distribution of the sediment and the geometrical quantities of the gravel deposits, such as the width, height and length of the deposit. It is shown that the dynamics of the erosion process were well reproduced by the numerical model using non-uniform sediment. Furthermore, the erosion rates were in good agreement with the laboratory experiments, except for the initial phase of the experiments, where the erosion rates were highest and settling of the gravel deposit was observed in the laboratory experiments. Overall, the numerical model proved to be a suitable tool to predict the erosion process of artificial gravel deposits, and hence, can be recommended for the design of sediment replenishment measures.

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“…Among the different depth-averaged models, Wark et al (1990) developed the one-dimensional lateral distribution method (1D-LDM) for simulating the local flow velocity and/or unit water discharge (q = U×H, where U is the depth averaged streamwise velocity and H is the water depth) in a river cross section. Then, the 1D-LDM has been applied to a wide range of applications, varying from small-scale laboratory flumes to largescale of laboratory channels and real rivers (e.g., Choi & Joung, 2012;Choi & Lee, 2015;Choi & Pham Van, 2010;Darby & Thorne, 1996;Menéndez et al, 2008;Vionnet et al, 2004;etc). These applications demonstrate that the 1D-LDM can be used to predict the local flow velocity in a river cross section.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of hydrodynamic characteristics and bedload transport in cross sections of two gravel-bed rivers based on one-dimensional lateral distribution method

Van

Chua

2020

International Journal of Sediment Research

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Numerical prediction of morphological change of straight trapezoidal open-channel

Cited by 6 publications

References 10 publications

Prediction of Total Sediment Load in Sand‐Bed Rivers in Korea Using Lateral Distribution Method

Prediction of Total Sediment Load in Sand‐Bed Rivers in Korea Using Lateral Distribution Method

Modeling Streambank and Artificial Gravel Deposit Erosion for Sediment Replenishment

Numerical simulation of hydrodynamic characteristics and bedload transport in cross sections of two gravel-bed rivers based on one-dimensional lateral distribution method

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