Journal of Applied Sciences

Volume 22 (5), 217-232, 2022


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A New Coefficient of Discharge Relation for Flow Over Broad-Crested Rectangular Side Weir in a Trapezoidal-Type Channel

Amirhosein Sarchami, Mahdi Tousi, Hossein Afshar and Goodarz Ahmadi

Background and Objective: One of the new methods to receive and distribute flow in floodwater spreading systems is utilizing side weirs. These weirs are employed extensively in environmental, irrigation and hydraulics engineering to control the flow direction. This work evaluates the hydraulic behaviour of the rectangular broad-crested side weir in a trapezoidal shape channel numerically and experimentally to calculate the coefficient of discharge. Materials and Methods: In this investigation, gene expression programming is employed to predict the discharge coefficient under various conditions. Results: The study results revealed that six key factors affect the side weir discharge coefficient, which is the froude number (Fr), main channel’s bed slope, side weir step’s height to side weir’s length the side weir’s angle (θ), side weir step’s height to upstream flow depth of side weir and upstream flow depth of side weir to side weir’s length . The results of nearly 300 experimental tests were compiled to develop a new correlation for predicting the coefficient of discharge under subcritical conditions for a broad-crested side weir. Regression models were used to investigate the connection between the coefficient of discharge and the relevant parameters. The results revealed that the coefficient of discharge was decreased by increasing the and the side weir step’s height to the length of the side weir ratio. Conclusion: In addition, the coefficient of discharge was increased by increasing the ratio of the side weir flow depth upstream to the height of the side weir step and the ratio of the side weir upstream flow depth to the length of the side weir.

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How to cite this article:

Amirhosein Sarchami, Mahdi Tousi, Hossein Afshar and Goodarz Ahmadi, 2022. A New Coefficient of Discharge Relation for Flow Over Broad-Crested Rectangular Side Weir in a Trapezoidal-Type Channel. Journal of Applied Sciences, 22: 217-232.


DOI: 10.3923/jas.2022.217.232
URL: https://ansinet.com/abstract.php?doi=jas.2022.217.232

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