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Discharge Capacity of Conventional Side Weirs in Supercritical Conditions

Author(s): A. Parvaneh; M. R. Jalili Ghazizadeh; A. Kabiri-Samani; M. A. Nekooie

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Abstract: Side weirs are widely used for level control and flow regulation in hydraulic engineering applications such as irrigation, land drainage, and sewer systems. These hydraulic structures allow a part of the flow to spill laterally when the surface of the flow in the main channel rises above the weir crest. The supercritical flow over a side-weir is a typical case of spatially varied flow with decreasing discharge. This study is aimed at investigating the variations of specific energy along the side-weir using experimental results. Some diagrams have been presented in terms of dimensionless ratio of diverted discharge to total discharge. These diagrams which can be used in the design of side weirs were obtained from the results of over 100 conducted tests on the supercritical flow. According to the obtained results, for the tests with upstream discharge of 45 lit/sec, the second-order relationship Q/Q1=∝X 2 +βX+1 is valid between dimensionless parameters, namely Q/Q 1 and X=x/B. Moreover, q=dQ/dx varies linearly with respect to X. Two linear equations have been developed for tests with the discharge of 45 lit/sec to determine∝, βin terms of studied dimensionless parameters.

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Year: 2016

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