THE EFFECT OF UPSTREAM AND DOWNSTREAM BED LEVEL ON DISCHARGE COEFFICIENT OF DUCKBILL SHARP-CRESTED WEIR

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DAVOUDMAGHAMI DAVOUD; BANEJAD HOSSEIN; SANEIE MOJTABA; MOHSENI MOVAHHED SEYED ASADOLLAH

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Journal: WATERSHED ENGINEERING AND MANAGEMENT Year:2018 | Volume:9 | Issue:4 Page(s): 413-425

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Title

THE EFFECT OF UPSTREAM AND DOWNSTREAM BED LEVEL ON DISCHARGE COEFFICIENT OF DUCKBILL SHARP-CRESTED WEIR

Author(s)

DAVOUDMAGHAMI DAVOUD | BANEJAD HOSSEIN | SANEIE MOJTABA | MOHSENI MOVAHHED SEYED ASADOLLAH | Issue Writer Certificate

Keywords

DISCHARGE CAPACITYQ1

HEAD TO WEIR HEIGHT RATIO (H/P)Q1

L/W RATIOQ1

NONLINEAR WEIRQ1

SUBMERGED FLOWQ1

Abstract

Sharp-crested weirs are widely used for the purposes of flow measurement, flow diversion and water level control in hydraulics, irrigation, and environmental projects. Discharge coefficient at these weirs is a function of head to weir height ratio (H/P). In a constant head, flow increases by increasing the length of weir in the plan. One of these weirs is the duckbill weir. Sometimes, it is changed upstream and downstream bed level by deposition of sediments in the upstream of weir, erosion in the downstream of the weir, etc. These changes cause changes in the flow characteristics such as discharge coefficient. In this study, the effect of these changes on the discharge coefficient of duckbill weir is studied. The results showed that the change in the height of duckbill weir has no effect on the discharge coefficient. But, increasing L/W RATIO (L and W are respectively length of weir and width of flume) decreases discharge coefficient. Also, with increasing, maximum of discharge coefficient gives in the amount of H/P less. So that maximum of discharge coefficient in L/W RATIO 2, 3 and 4 is respectively 0. 73, 0. 68 and 0. 63 which respectively occurred in the amount of H/P of 0. 5, 0. 3 and 0. 25. Discharge coefficient is reduced with increasing upstream bed level. In SUBMERGED FLOW, Reducing the downstream bed level increase discharge coefficient but changes in downstream bed level have no effect on discharge coefficient until flow is not submerged, also, conditions of aeration are the same. By increasing the L/W RATIO in duckbill weir from 3 to 4, amount of H/P in threshold of flow Interference and local Submergence decreased from 0. 5 to 0. 3.

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APA: Copy

DAVOUDMAGHAMI, DAVOUD, BANEJAD, HOSSEIN, SANEIE, MOJTABA, & MOHSENI MOVAHHED, SEYED ASADOLLAH. (2018). THE EFFECT OF UPSTREAM AND DOWNSTREAM BED LEVEL ON DISCHARGE COEFFICIENT OF DUCKBILL SHARP-CRESTED WEIR. WATERSHED ENGINEERING AND MANAGEMENT, 9(4 ), 413-425. SID. https://sid.ir/paper/234570/en

Vancouver: Copy

DAVOUDMAGHAMI DAVOUD, BANEJAD HOSSEIN, SANEIE MOJTABA, MOHSENI MOVAHHED SEYED ASADOLLAH. THE EFFECT OF UPSTREAM AND DOWNSTREAM BED LEVEL ON DISCHARGE COEFFICIENT OF DUCKBILL SHARP-CRESTED WEIR. WATERSHED ENGINEERING AND MANAGEMENT[Internet]. 2018;9(4 ):413-425. Available from: https://sid.ir/paper/234570/en

IEEE: Copy

DAVOUD DAVOUDMAGHAMI, HOSSEIN BANEJAD, MOJTABA SANEIE, and SEYED ASADOLLAH MOHSENI MOVAHHED, “THE EFFECT OF UPSTREAM AND DOWNSTREAM BED LEVEL ON DISCHARGE COEFFICIENT OF DUCKBILL SHARP-CRESTED WEIR,” WATERSHED ENGINEERING AND MANAGEMENT, vol. 9, no. 4 , pp. 413–425, 2018, [Online]. Available: https://sid.ir/paper/234570/en

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