Application of potential flow to circular-crested weir

Heidarpour, Manouchehr; Mohammadzadeh‐Habili, Jahanshir; Haghiabi, Amir Hamzeh

doi:10.3826/jhr.2008.3181

Cited by 32 publications

(10 citation statements)

References 11 publications

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“…As seen in Equation , to increase the discharge capacity of weirs some methods can be considered, such as increasing the discharge coefficient, increasing the length of the crest of the weir and increasing H . To increase the discharge coefficient of weirs, various shapes including circular crest weirs and quarter‐circular crested weirs have been proposed (Haghiabi, ; Heidarpour et al ., ; Mohammadzadeh‐Habili et al ., ). To increase the length of the crest of weirs, nonlinear creation of the crest has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Improving Modelling of Discharge Coefficient of Triangular Labyrinth Lateral Weirs Using SVM, GMDH and MARS Techniques

Parsaie

Haghiabi

2017

Irrigation and Drainage

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In this study the discharge coefficient (Cd) of labyrinth lateral weirs was modelled and predicted using artificial neural network (ANN), adaptive neuro fuzzy inference system (ANFIS), support vector machine (SVM), group method of data handling (GMDH), and multivariate adaptive regression splines (MARS) techniques. To this end, a related data set was collected from the literature. Results indicated that the proposed ANN model includes two hidden layers with eight and five neurons in the first and second hidden layers, respectively. Testing transfer functions demonstrated that the radial basis function (RBF) has the best outcome. Evaluating the performance of the ANN model shows that this model with a coefficient of determination (R2 = 0.96) and root mean square error (RMSE =0.07) in the testing stage has suitable functionality. Reviewing the ANFIS model showed that this model with one hidden layer containing seven membership functions within the Gaussian function could achieve R2 = 0.94 and RMSE =0.136 for predicting the discharge coefficient. During preparation of SVM, it was found that this model with RBF as the best kernel function obtained R2 = 0.96 and RMSE =0.07. The structure of the MARS and GMDH models pointed out that the Froude number, grandiose index and ratio of upstream flow depth to the height of weir are the most effective parameters for predicting the discharge coefficient. Minimum R2 and RMSE achieved were equal to 0.93 and 0.08, respectively, in the testing stage for the MARS and GMDH models. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Improving Modelling of Discharge Coefficient of Triangular Labyrinth Lateral Weirs Using SVM, GMDH and MARS Techniques

Parsaie

Haghiabi

2017

Irrigation and Drainage

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“…Channels are the main structures which have been used for conveying the water or wastewater in the water engineering projects (Akan 2011;Subramanya 2009). Study on the flow discharge in the open channels has become an important subject in management of water resources; therefore, several researchers have attempted to propose approaches for measurement and estimation of discharge in the open channel (Haghiabi 2012;Heidarpour et al 2008;Parsaie and Haghiabi 2015a, b, c;Parsaie et al 2015a, b;Vatankhah 2012Vatankhah , 2013a. Calculating the flow discharge in conventional open channels usually is conducted by classical empirical formulas such as Manning and Chezy formulas (Parsaie 2016).…”

Section: Introductionmentioning

confidence: 99%

Flow discharge estimation in compound open channel using theoretical approaches

Parsaie

Najafian

Yonesi

2016

Sustain. Water Resour. Manag.

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Estimating the value of discharge in water ways is an important factor in the flood controlling projects. Recently by advances in flood management, investigators have proposed to use the concept of compound section for modeling the flow characteristics in the natural waterways such as rivers. Several conceptual and theoretical approaches based on the idea of compound section have been proposed for estimating the discharge in rivers. In this study, the performances of the theoretical methods were assessed using performing series of experiments in straight prismatic compound open channel and also analyzing the published data in the literature. Analyzing the performance of theoretical methods shows that Divided Channel Method including vertical bounded line with the determination of coefficient (0.91) and root mean square error (0.02) is an accurate method through the theoretical approaches and only this method has suitable ability to apply for practical purposes.

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“…Changing the radius and height of weir had no effect on discharge coefficient [13]. Heidarpour et al (2008) studied pressure distribution on cylinder and circular crested weirs with various heights. In this research, modeling were performed at various heights of 0, 12.5, 15.7, 18.7 and = = 90.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Comparison of Flow Hydraulic Parameters in Circular Crested Weir Using Flow3D

Ghazizadeh

Moghaddam

2016

Civ Eng J

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Circular crested weirs consist of a circular crested of upstream and downstream walls. These weirs are widely used in hydraulic engineering as water discharge structures and can be used to control water level in channels and tanks. In the present study, using Flow3D software, hydraulic properties were investigated to find weir geometry optimization through CFD method. Also, this study attempted to investigate flow on some sections of circular crested weirs in 3 groups and 11 models. Upstream and downstream slope changes as well as the height of the weir were also studied. To validate the model, laboratory models were used. In the research, flow depth parameters on crest, pressure distribution, velocity distribution, energy loss on circular crested weirs, as well as the height and changes of upstream and downstream slope were evaluated. Flow depth on the body of circular crest in this state is about 0.71 (H1). Upstream slope changes on flow depth on the weir’s crest revealed that increasing upstream slope causes to the increase of flow relative depth (H1/R) on the crest about 62%. Downstream changes in H1/R values less than 0.7 have no significant effect on discharge coefficient; however, increasing H1/R values seems to cause more change in slope.

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Application of potential flow to circular-crested weir

Cited by 32 publications

References 11 publications

Improving Modelling of Discharge Coefficient of Triangular Labyrinth Lateral Weirs Using SVM, GMDH and MARS Techniques

Improving Modelling of Discharge Coefficient of Triangular Labyrinth Lateral Weirs Using SVM, GMDH and MARS Techniques

Flow discharge estimation in compound open channel using theoretical approaches

An Experimental and Numerical Comparison of Flow Hydraulic Parameters in Circular Crested Weir Using Flow3D

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