Flow Measurements Using a Sluice Gate; Analysis of Applicability
- Is it possible to use the given formulas and discharge coefficients determined for the submerged gate outflow for structures with the gate installed in intake canals with trapezoidal cross-sections?
- Where should the downstream water depth measured for the submerged gate be, installed in a canal with rectangular cross-section, to ensure a good fit between measured and calculated flow rates?
- How does the construction of guides necessary for lifting the gate (changing the width of the opening in relation to the width of the channel) affect the values of the flow coefficients for the submerged flow conditions?
2.1. One-Dimensional Description of the Sluice Gate Flow
2.2. Studies on Submerged Flow through Irrigation Sluice Gate
- As it was not possible to clearly determine the position of the cross-section in which depth hz should be measured, relationship (1) is not useful for calculating water flow rates on the basis of the depths measured upstream and downstream of the sluice gate.
- The location of the cross-section for measuring downstream water depth h, used to calculate downstream discharge coefficients Cd using the Swamme relationship (5), changes with the opening height of the gate a.
- It is possible to use the Swamme relationship (5) to calculate the discharge coefficients on the basis of the downstream water depth measured in a fixed cross-section as in the practice of adopting corrections provided in relationships (8), (9). Calculated on the basis of measured depths, upstream H, downstream h and gate opening height a with Equations (11) and (12), the flow factors allow us to achieve compliance between the calculated flow rates and measured rates with accuracy of about 10%, confirming the practical usefulness of this method in estimating flow through the sluice gate, as stated by Boiten (1992) .
- This approach might be useful in calibration of other designs of sluice gates for flow measurements.
Conflicts of Interest
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Kubrak, E.; Kubrak, J.; Kiczko, A.; Kubrak, M. Flow Measurements Using a Sluice Gate; Analysis of Applicability. Water 2020, 12, 819. https://doi.org/10.3390/w12030819
Kubrak E, Kubrak J, Kiczko A, Kubrak M. Flow Measurements Using a Sluice Gate; Analysis of Applicability. Water. 2020; 12(3):819. https://doi.org/10.3390/w12030819Chicago/Turabian Style
Kubrak, Elżbieta, Janusz Kubrak, Adam Kiczko, and Michał Kubrak. 2020. "Flow Measurements Using a Sluice Gate; Analysis of Applicability" Water 12, no. 3: 819. https://doi.org/10.3390/w12030819