SELF-SIMILARITY THEORY TO DETERMINE HEAD-DISCHARGE RELATIONSHIPS OF SLUICE GATES WITH CYLINDRICAL EDGE IN FREE AND SUBMERGED FLOWS

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NOUROLLAHI M.; ZIAEI A.N.; BEHESHTI A.A.

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Journal: Journal of Water and Soil Conservation Year:2016 | Volume:22 | Issue:6 Page(s): 41-59

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Title

SELF-SIMILARITY THEORY TO DETERMINE HEAD-DISCHARGE RELATIONSHIPS OF SLUICE GATES WITH CYLINDRICAL EDGE IN FREE AND SUBMERGED FLOWS

Author(s)

NOUROLLAHI M. | ZIAEI A.N. | BEHESHTI A.A. | Issue Writer Certificate

Keywords

INCOMPLETE SELF-SIMILARITYQ2

SHARP SLUICE GATEQ2

CONTRACTION COEFFICIENTQ2

Abstract

Background and Objectives: Gates are among the most common hydraulic structures in open channels that are used for flow control and water level control. The vertical slide gates suffer from lower CONTRACTION COEFFICIENT and thus lower flow rate capacity. In this paper, the hydraulic performance of a new modified gate, combination of a vertical slide gate with a cylindrical edge (Drum gate), has been studied.Materials and Methods: Laboratory tests of this study are performed in Hydraulic Laboratory of Water Engineering Group from University of Ferdowsi in Mashhad, in rectangular flume with length of 10 cm, width 30 cm, height 50 cm. In this study, totally, from nine gates that include four cylindrical slide gates and four half-cylindrical slide gates with diameter of 63 mm, 90 mm, 125 mm and 200 were used. The dimensionless stage-discharge relationship was proposed based on dimensional analysis and using the INCOMPLETE SELF-SIMILARITY concept in free and submerged conditions. In these relationships, flow rate is related to the upstream depth, gate opening and the cylinder diameter.Results: Finally, the development of the relationship of Ferro and Buckingham theory and the Self-Similarity Theory, relationships to estimate the flow rate of a half and full cylindrical gates for free and submerged flow conditions were presented separately and with proposed correlation with experimental data and statistical evaluation of acceptable accuracy were examined and the experimental data were analyzed. The proposed equation is accurate and practical so that it removes the need to consider the discharge coefficient. Results showed that this equation can be fitted to laboratory data very well. The mean relative error for estimation of discharge in the free and submerged conditions was less than 2 and 5 percent, respectively. Therefore, these equations can be used as a design tool for slide gates with cylindrical edge.Conclusion: Since accurate estimate discharge increased management function of water distribution network and also leads to an increased executive certainty in gate design, it can be concluded that the combination of dimensional analysis and the self-similarity theory can estimate the discharge obtained with high accuracy.

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APA: Copy

NOUROLLAHI, M., ZIAEI, A.N., & BEHESHTI, A.A.. (2016). SELF-SIMILARITY THEORY TO DETERMINE HEAD-DISCHARGE RELATIONSHIPS OF SLUICE GATES WITH CYLINDRICAL EDGE IN FREE AND SUBMERGED FLOWS. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 22(6), 41-59. SID. https://sid.ir/paper/156348/en

Vancouver: Copy

NOUROLLAHI M., ZIAEI A.N., BEHESHTI A.A.. SELF-SIMILARITY THEORY TO DETERMINE HEAD-DISCHARGE RELATIONSHIPS OF SLUICE GATES WITH CYLINDRICAL EDGE IN FREE AND SUBMERGED FLOWS. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2016;22(6):41-59. Available from: https://sid.ir/paper/156348/en

IEEE: Copy

M. NOUROLLAHI, A.N. ZIAEI, and A.A. BEHESHTI, “SELF-SIMILARITY THEORY TO DETERMINE HEAD-DISCHARGE RELATIONSHIPS OF SLUICE GATES WITH CYLINDRICAL EDGE IN FREE AND SUBMERGED FLOWS,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 22, no. 6, pp. 41–59, 2016, [Online]. Available: https://sid.ir/paper/156348/en

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