Volume 18, Issue 69 (fall 2014)                   jwss 2014, 18(69): 141-150 | Back to browse issues page

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Honar T, Mazloom Shahraki S. Discharge Coefficient Analysis of Cylindrical and Semi- Cylindrical Side Weirs in Subcritical Flow. jwss 2014; 18 (69) :141-150
URL: http://jstnar.iut.ac.ir/article-1-2869-en.html
Dept. of Water Eng. College of Agric., Shiraz Univ., Shiraz, Iran. , toorajhonar@yahoo.com
Abstract:   (13277 Views)

Cylindrical and semi-cylindrical weirs are used in water distribution systems for flow measurement in open channels and for control of water surface. Review of literature shows that cylindrical and semi-cylindrical weirs are not widely used in practice. Because of their low construction cost and simplicity, an investigation was done to study cylindrical and semi-cylindrical weirs in terms of their hydraulic characteristics such as discharge coefficient, energy loss and flow depth over the spillway crest. The research was done for 128 models in the hydraulic laboratory of water engineering department, Shiraz University. According to the results, due to flow separation from body of the weirs, flow coefficient increases in the cylindrical and semi cylindrical weirs by 57%. It was found that discharge coefficient increases by increasing the total head of upstream. Therefore, construction of cylindrical and semi-cylindrical weirs and side weir is recommended due to reduction in weir length, increased hydraulic efficiency, and reduced administrative costs compared to other wide edge side weirs.

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Type of Study: Research | Subject: Ggeneral
Received: 2015/01/11 | Accepted: 2015/01/11 | Published: 2015/01/11

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