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the study of hydraulic properties of quarter-circular crested stepped spillway
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نویسنده
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parsaie abbas ,haghiabi amirhamzeh ,saneie mojtaba ,torabi hasan
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منبع
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علوم و مهندسي آبياري - 2021 - دوره : 43 - شماره : 4 - صفحه:23 -32
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چکیده
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In this paper, the quartercircular crested stepped spillway (qcss) is introduced and its hydraulic properties including the discharge coefficient (cd) and energy dissipation of flow are investigated. the qcss consists of a quartercircular as the crest and a stepped chute. the cd of qcss variates between 0.9 and 1.4 considering the range of relative upstream head (hup/r) between 0.1 and 1.0, but at the same range of hup/r, the cd of the broad crested stepped spillway (bcss) changes between 0.9 and 1.0. the ratio of energy dissipation changes between 30% and 98% for both hydraulic models. comparing the performance of qcss and bcss shows that in the skimming flow condition, the cd of qcss is about 30%more than the bcss. whereas, in the same flow regime, the energy dissipation of the flow on qcss is a bit less than the bcss about 10%.
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کلیدواژه
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circular crested weir ,cascade weir ,discharge coefficient ,flow measurement ,energy dissipation
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آدرس
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lorestan university, water engineering department, iran. shahid chamran university of, iran, lorestan university, water engineering department, iran, soil conservation and watershed management institute, iran, lorestan university, water engineering department, iran
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The Study of Hydraulic Properties of Quarter-Circular Crested Stepped Spillway
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Authors
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Parsaie Abbas ,Haghiabi AmirHamzeh ,Saneie Mojtaba ,Torabi Hasan
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Abstract
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In this paper, the quartercircular crested stepped spillway (QCSS) is introduced and its hydraulic properties including the discharge coefficient (Cd) and energy dissipation of flow are investigated. The QCSS consists of a quartercircular as the crest and a stepped chute. The Cd of QCSS variates between 0.9 and 1.4 considering the range of relative upstream head (hup/R) between 0.1 and 1.0, but at the same range of hup/R, the Cd of the broad crested stepped spillway (BCSS) changes between 0.9 and 1.0. The ratio of energy dissipation changes between 30% and 98% for both hydraulic models. Comparing the performance of QCSS and BCSS shows that in the skimming flow condition, the Cd of QCSS is about 30%more than the BCSS. Whereas, in the same flow regime, the energy dissipation of the flow on QCSS is a bit less than the BCSS about 10%.
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Keywords
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Circular Crested Weir ,Cascade Weir ,Discharge Coefficient ,Flow Measurement ,Energy dissipation
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