Hydraulic characteristics of a new weir entitled of quarter-circular crested weir |
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| Affiliation: | 1. Department of Civil Engineering, Razi University, Kermanshah, Iran;2. Department of Computer System, Faculty of Computer Science and Information Technology, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. Department of Civil Engineering, Razi University, Kermanshah, Iran;2. Water and Wastewater Research Center, Razi University, Kermanshah, Iran;3. Department of Statistics, Razi University, Kermanshah, Iran;1. Islamic Azad University, AHAR Branch, Civil Engineering Department, Tabriz, East Azerbaijan, Iran;2. Dokuz Eylül University, Civil Engineering Department, Tinaztepe Campus, Box. 35160, Izmir, Turkey;3. Urmia University, Water Engineering Department, Urmia, West Azerbaijan, Iran;4. Civil Engineering Department, Dokuz Eylül University, 35160, Buca, Izmir, Turkey;5. Water Engineering Department, Urmia University, Urmia, West Azerbaijan, Iran;1. Department of Structural Mechanics & Hydraulics Engineering, University of Granada, 18001, Spain;2. Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;3. Department of Civil Engineering, Sepidan Branch, Islamic Azad University, Sepidan, Iran |
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| Abstract: | Weirs are used for flow measurement, flood control in reservoirs and water level control in irrigation systems. In this study, a new weir entitled of quarter-circular crested weir is investigated. This weir is geometrically consisted of a quarter-circular crest of radius R, upstream slope α and vertical downstream face. The downstream face of the weir must be ventilated. Discharge coefficient, crest section velocity and pressure profiles, pressure distribution on the crest surface and upper and lower nappe profiles of flow over the quarter-circular crested weir were experimentally investigated. Results indicated that discharge coefficient of the weir is a constant value and equals to 1.261. In the range of H/R<1.5, it is more than the discharge coefficient of circular crested weir. The lower nappe profile of free jet over the weir can also be considered as the ogee shape of the proposed weir. |
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| Keywords: | Quarter-circular crested weir Discharge coefficient Open channel Circular crested weir Ogee weir |
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