Application of numerical model in determining the discharge coefficient containing suspended sediments passing through side weirs

Document Type : Research Paper

Authors

1 Department of Civil Engineering, Islamshahr Branch ,Islamic Azad university , Islamshahr ,Iran.

2 Department of Civil Engineering, Dehdasht Branch ,Islamic Azad University, Dehdasht ,Iran.

Abstract

Side weirs are one of the most common water structures that are used to transfer or pass flood and excess water from headwater to downstream in channels and dams. One of the factors, which is often less considered in the design of such weirs, is the amount of suspended load along with the flow. Basically, suspended sediments along with the flow, in addition to changes in the density of the passing water, can change most of the assumptions in the design of weirs. Due to the high cost and time-consuming nature of physical modeling, the powerful Flow-3D numerical model was used to simulate the flow of suspended sediments in this study. A channel with a side weir was modeled according to laboratory conditions and the discharge coefficient passing through the side weir at different concentrations of the suspended load was calculated. The results, while confirming the ability of the Flow-3D numerical model to simulate the flow containing sediment passing through the side weirs, showed that with increasing the concentration of suspended flow load, the discharge coefficient passing through the side weir increases. Also, increasing the weir’s height along with increasing the concentration of suspended sediments has led to a significant increase in the discharge coefficient passing through the side weir.

Keywords

References

  1. Khani M, (2007). Numerical modeling of the flow field containing suspended sediments in the side weirs in order to determine the discharge coefficient. M.S.C Dissertation. University of Islamic Azad Rudehen. iran
  2. De Marchi G, (1934). Essay on the performance of lateral weirs (in Italian). L’Energia Ellectrica Milan, 11(11): 849–860.
  3. Subramanya K, Awasthy S C, (1972). Spatially varied flow over side-weir. J Hydr Engrg ASCE, 98(1): 1-10.
  4. Nadesamoorthy T, Thomson A, (1972). Discussion of spatially varied flow over side weir. J Hydr Engrg ASCE, 98(2): 2234-2235.
  5. Yu-Tech L, (1972). Discussion of spatially varied flow over side weirs. J Hydr Engrg ASCE, 98(11): 2046-2048.
  6. Hager W H, (1987). Lateral outflow over side weirs. J Hydr Engrg ASCE, 113(4): 491-504.
  7. Swamee P K, Pathak S K, Mohan M, Agrawal S K, Ali M S, (1994). Subcritical flow over rectangular side weir. J Hydr Engrg ASCE, 120(1): 212–217.
  8. Borghei S M, Jalili M R, Ghodsian M, (1999). Discharge coefficient for sharp crested side weirs in subcritical flow. J Hydr Engrg ASCE, 125(10): 1051- 1056.
  9. Ayyoubzadeh S A, Gohari-Asadi S, Vali-samani J M, (2006). The effect of suspended load on discharge coefficient of side weirs in rectangular channels. Journal of agricultural engineering research, 7(26).
  10. Ameri A, Ahmadi A, Dehghan A A, (2015). Determination of discharge coefficient of compound triangular -rectangular sharp crested side weirs. Journal of Water and Soil Conservation, 22(3).
  11. Cassidy J J, (1965). Irrigational flow over the spillways of finite height. J Mech Eng Div, ASCE, 91(6): 155–173.
  12. Ikegawa M, Washizu K, (1973). Finite element method applied to analysis of flow over a spillway crest. J Numer. Methods Eng., 6: 179-189.
  13. Betts, P, (1979). A variational principle in terms of stream function for free-surface flows and its application to the finite element method. Computers & Fluids – Compute fluids, 7:145-153.
  14. Li W, Xie Q, Chen C J, (1989). Finite analytical solution of flow over spillway. Eng. Mech. ASCE,115: 2635-2647.
  15. Savage B M, Johnson M C, (2001). Flow over ogee spillway: Physical and numerical model case study. J. Hydraulic Eng. ASCE, 127(8): 640-649.
  16. Lee K L, Holly E R, (2002). Physical modeling for side channel weirs. Center of research for water resources. The university of Texas at Austin. Available on http:www.crwr.utexas.edu/online shtml.
  17. Vasquez A, Walsh B W, (2009). CFD simulation of local scour in complex piers under tidal flow. 33rd IAHR Congress: Water Engineering for a Sustainable Environment. Vancouver, Canada, 913-920.
  18. Ferrari A, (2010). SPH simulation of free surface flow over a sharp-crested weir. Advances in Water Resources, 33(3):270-276.
  19. Ghanadan R, Zahiri A R, Kahe M, Jalalodin M S, (2012). Numerical simulation of wide edge -side weir, using flow-3d model. National Conference on Water and Wastewater Engineering. (In Persian).
  20. Anderson R M, Tullis B P, (2012). Comparison of piano Key and rectangular Labyrinth Weir Hydraulics. Journal of Irrigation and Drainage Engineering, ASCE, 138(4), 358-361.
  21. Zahiri A, Azamathulla H M, Bagheri S M, (2013). Discharge coefficient for compound sharp crested side weirs in subcritical flow conditions. J. Hydrol. 480: 162.
  22. Namaee M R, Shadpoorian R, (2015). Numerical Modeling of Flow Over Two Side Weirs. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING. 41(4).
  23. Parsaie A, Haghiabi A H, (2015). The Effect of Predicting Discharge Coefficient by Neural Network on Increasing the Numerical Modeling Accuracy of Flow Over Side Weir. Water Resources Management 29(4).
  24. Karimi M, Attari J, Saneie M, Jalili M, (2017). Experimental study of discharge coefficient of a Piano Key Side Weir. Labyrinth and Piano Key Weirs III – PKW .109-116.
  25. Gharib R, Heydari M, Kardar S, Shabanlou S, (2020). Simulation of discharge coefficient of side weirs placed on convergent canals using modern self-adaptive extreme learning machine. Appl Water Sci, 10(50) (2020).
  26. Zakwan M, Khan I, (20200. Estimation of Discharge coefficient for side weirs. Water and Energy International, 62(11):71-74.
  27. Lindermuth A, Ostrander P, Achleitner S, Gems B, Aufleger M, (2021). Discharge Calculation of Side Weirs with Several Weir Fields Considering the Undisturbed Normal Flow Depth in the Channel. Water, 13, 1717.
Journal of Hydraulic Structures
Volume 7, Issue 3 - Serial Number 17
November 2021
Pages 42-58

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