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Study the Hydraulic Flow on the Compound Structure of Weir-Gate with Compound Weir of Circular-Trapezoidal Rectangular | ||
| تحقیقات مهندسی سازه های آبیاری و زهکشی | ||
| Article 8, Volume 19, Issue 71, August 2018, Pages 99-112 PDF (1.44 M) | ||
| Document Type: Original Article | ||
| DOI: 10.22092/aridse.2017.110402.1216 | ||
| Authors | ||
| Mahsa Pesarakloo1; Alireza Emadi* 2 | ||
| 1MSc Student of Water Structure, Water Engineering Department, Sari Agricultural Sciences and Natural Resources University | ||
| 2Associate Professor, Water Engineering Department, Sari Agricultural Science And Natural Resources University | ||
| Abstract | ||
| Compound sharp crested weir for measuring the discharge with reasonable sensitivity and accuracy in a wide range of flow, as appropriate solution can be used. Also the transitional water containing sediment and floating will cause problems in how they function. One of the options that can be used to extend weir-gate combined compound sharp crested weir with gate. The purposed of this research, investigation of combined flow in sharp crested weir in the state of compound weir with circular- trapezoidal- rectangular sections by combining gate with opening height of 1.5, 3 and 4.5cm. Experiments carried out in an experimental rectangular canal with length of 12 meters and width of 5 meters. Based on experimental data the results show that, discharge coefficient in compound weir is in the range of 0.58 to 0.85 and in compound weir- gate is in the range of 0.38 to 0.78. The results showed that for a known head over the weir, the discharge coefficient in compound weir-gate is reduced with increasing the height of the gate.The mean values of the coefficient of determination (R2) and the normalized root mean square error (NRMSE) are 0.96 and 0.06, respectively. The results showed that the use of a linear combination of flow equations in compound weir with circular- trapezoidal- rectangular sections and compound weir-gate, with acceptable accuracy is able to estimate the discharge coefficient. | ||
| Keywords | ||
| Circular Weir; Compound Weir-Gate; Discharge Coefficient; Flow Measurement | ||
| References | ||
|
Ameri, M., Ahmadi, A. and Dehghani, A. A. 2015. Discharge coefficient of compound triangular–rectangular sharp-crested side weirs in subcritical flow conditions. Flow Meas. Instrum. 45, 170-175.
Aydin, I., Altan-Sakarya, A. B. and Sisman, C. 2011. Discharge formula for rectangular sharp-crested weirs, Flow Meas. Insrum. 22(1): 144-151.
Balachandar, R., Silvana. S. and Ramamurthy. A. S. 1991. A note on circular sharp-crested weirs. Can. J. Civ. Eng. 18, 881 -885.
Boss, M. G. 1988. Dischage Measurement Structures. ILRI Pub. Wageningn, USA.
Esmaeili, K. and Fathimoghadam, M. 2006. The discharge coefficient in the weir-valve model. The First Iranian National Congress of Irrigation and Drainage. Apr. 12. Ahvaz, Iran. (in Persian)
Heidarpour, M., Razavian, S. H. and Hosseini, Y. 2014. Study of simultaneous flow over sharp-crested trapezoidal weir and below sluice gate. J. Sci. Technol. Agric. Nat. Resour. 18(68): 147-156.
Jan, C. D., Chan, D. and Lee, M. H. 2006. Discussion of design and calibration of harp-crested weir. J. Hydraul. Eng. 132(8) 868-872.
Khassaf, S. I. and Abbas, H. A. 2013. Study the free flow over compound weir and below semicircular gate.Int. J. Sci. Eng. Res. 4(10): 1486-1491.
Kindsvater, C. E. and Carter, R. W. 1959. Discharge characteristics of rectangular thin-plate weirs. T- Am. Soc. Civil Eng. 124, 772-822.
Martinez, J., Recca, J., Morillas, M. T. and Lopez, J. G. 2005. Design and calibration of a compound
Mousavi, S. N., Farsadizadeh, D., Arvanaghi, H. and Abbaspour, A. 2015. Investigation of effective parameters on discharge coefficient of compound arched circular-rectangular sharp-crested weirs.J. Water Soil. 29(4): 861-873. (in Persian)
Negm, A. M., El-Saiad, A. A. and Saleh, O. K. 1997. Characteristics of combined flow over weirs and below submerged gates. Proceeding of Al-Mansoura Engineering and 2nd International Conference (MEIC'97). April 1-3. Faculty of Engineering, Al-Mansoura University, Al-Mansoura, Egypt.
Negm, A. M., Al-Brahim, A. M. and Alhamid, A. A. 2002. Combined-free flow over weirs and below gates. J. Hydraul. Res., 40(3): 359-365.
Negm, A. M., El-Saiad, A. A., Alhamid, A. A. and Husain, D. 1994. Characteristics of simultaneous flow over weirs and below inverted V-Notches Gate. Civil Eng. Res. Mag. 16(9): 786-799.
Ornaghi, H., Mahtabi, Gh., Valinia, M., Ghavidel, S. and Azimi, V. 2011. The study of discharge coefficient in compound overflow trapezoid-circular. The 10th Iranian Hydraulic Conference. Oct. 7. Rasht, Iran. (in Persian)
Razavian, S. H. and Heidarpour, M. 2007. Investigation of characteristics of the combined flow througha sharp rectangular weir with compressed and below a sharp rectangular weir without compaction. Proceeding of the 9th National Seminar on Irrigation and Evapotranspiration. Jan. 4-5. Shahid Bahonar University, Kerman. Iran. (in Persian)
Saffar, S. and Kashefipour, M. 2008. Estimation of flow in model overflow-valve using neural network model. The 2nd Iranian National Congress of Irrigation and Drainage. Aug. 23-25. Ahvaz, Iran.
Stevens, J. C. 1957, Flow through circular wiers. J. Hydraul. Eng. 83(6): 1-24.
Tai-Lee, J., Chuan-Chan, H., Kun-Huang, C. and Mou-Leu. J. 2012. Experiments on hydraulic relations for flow over a compound sharp-crested weir. Int. J. Physic. Sci. 7(14): 2229-2237.
Vatankhah, A. R. 2010. Flow measurement using circular sharp crested weirs. Flow Meas. Instrum.
Yasi, M. and Abbaspour, A. 2005. Flow over sharp-crested, truncated-triangular weirs. J. Agric. Knowl. 28(2): 165-182. (in Persian) | ||
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