Research on the Influence of Siltation Height of Check Dams the on Discharge Coefficient of Broad-Crested Weirs
Abstract
:1. Introduction
2. Experimental Design
2.1. Experimental System
2.2. Physical Model
2.3. Measurement Scheme
2.4. Experimental Case
2.5. Test Principle
- (1)
- Average velocity of section
- (2)
- Total hydraulic head over the weir
- (3)
- Discharge calculation formula of the weir
3. Results
3.1. Flow Pattern
3.2. Variation in Water Surface Profile along the Weir
3.2.1. Influence of Discharge on the Level of Flow at the Same Siltation Height
3.2.2. Influence of Siltation Height on the Level of Flow at the Same Discharge
3.3. Distribution of the Velocity along the Weir
3.3.1. Influence of Discharge on the Velocity of Flow at the Same Siltation Height
3.3.2. Influence of Siltation Height on the Velocity of Flow at the Same Discharge
3.4. Relationship between Hydraulic Head and Discharge or Siltation Height
3.5. Formula for Discharge Coefficient of the Broad-Crested Weir
4. Conclusions
- (1)
- With an increase in the siltation height, the backwater phenomenon of the flow in the upstream part of the broad-crested weir gradually decreases. The water level over the weir decreases, and the overall flow pattern gradually develops towards the open channel. This means that floods will pass more easily through spillways.
- (2)
- In the same siltation height condition, the water surface profile along the flow increases with an increase in discharge. However, in the same discharge condition, the water surface profile along the flow decreases with an increase in the siltation height, which reflects that the increase in siltation height improves the overflow capacity of the broad-crested weir.
- (3)
- The effects of discharge and siltation height change on the surface velocity of a broad-crested weir are concentrated in the front part of the weir, and the effects on the back part of the weir are smaller. In the same siltation condition, the surface velocity of the flow in front of the weir increases with an increase in the discharge. In the same discharge condition, the surface velocity of the water in front of the broad-crested weir gradually increases with an increase in the siltation height.
- (4)
- From the above analysis of hydraulic characteristics, we know that the influence of siltation on overflow should be considered in engineering design work. Therefore, we propose a new formula to calculate the discharge coefficient that meets the accuracy requirements. It can be applied to the estimation of discharge in practical reinforcement work on check dams.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Wang, Z.; Gui, L.; Zhang, J.; Li, Y. Research on the Influence of Siltation Height of Check Dams the on Discharge Coefficient of Broad-Crested Weirs. Water 2023, 15, 510. https://doi.org/10.3390/w15030510
Wang Z, Gui L, Zhang J, Li Y. Research on the Influence of Siltation Height of Check Dams the on Discharge Coefficient of Broad-Crested Weirs. Water. 2023; 15(3):510. https://doi.org/10.3390/w15030510
Chicago/Turabian StyleWang, Zhijian, Lili Gui, Jiaxuan Zhang, and Yongye Li. 2023. "Research on the Influence of Siltation Height of Check Dams the on Discharge Coefficient of Broad-Crested Weirs" Water 15, no. 3: 510. https://doi.org/10.3390/w15030510
APA StyleWang, Z., Gui, L., Zhang, J., & Li, Y. (2023). Research on the Influence of Siltation Height of Check Dams the on Discharge Coefficient of Broad-Crested Weirs. Water, 15(3), 510. https://doi.org/10.3390/w15030510