A hydraulic jump occurs in an open channel when the slope of the channel changes from ___________.
A hydraulic jump occurs in an open channel when the slope of the channel changes from ___________.
Show Hint
- MILD slope to STEEP slope
- STEEP slope to MILD slope
- MILD slope to ZERO slope
- STEEP slope to a STEEPER slope
The Correct Option is B
Solution and Explanation
This change in slope causes the kinetic energy of the flow to be suddenly dissipated, forming a jump which is visible as a sudden rise in the water surface.
Hence, the correct answer is (B).
Top Questions on Open Channel Flow
Consider flow in a long and very wide rectangular open channel. Width of the channel can be considered as infinity compared to the depth of flow. Uniform flow depth is 1.0 m. The bed slope of the channel is 0.0001. The Manning roughness coefficient value is 0.02. Acceleration due to gravity, \( g \), can be taken as 9.81 m/s\(^2\).
The critical depth (in m) corresponding to the flow rate resulting from the above conditions is ________ (round off to one decimal place).
- GATE CE - 2025
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- Match LIST-I with LIST-II:\[\begin{array}{|c|l|l|} \hline \textbf{LIST-I (Flow parameter of a channel flow)} & & \textbf{LIST-II (Proportional to)} \\ \hline \text{A. Mean velocity in a Lacey regime channel} & & \text{IV. $Q^{2/3}$} \\ \hline \text{B. Mean velocity in a lined channel} & & \text{II. $S^{1/3}$} \\ \hline \text{C. Normal scour depth in an alluvial channel} & & \text{III. $Q^{1/2}$} \\ \hline \text{D. Wetted perimeter of a Lacey regime channel} & & \text{I. $S^{1/2}$} \\ \hline \end{array}\] where $S$ is slope of channel and $Q$ is discharge. Choose the most appropriate match from the options given below:
- Critical depth in a channel is expressed by: (where $Q =$ discharge, $A =$ Area of flow, $T =$ top width of flow and $g =$ acceleration due to gravity)
A compound symmetrical open channel section as shown in the figure has a maximum of critical depth(s).
- GATE CE - 2023
- Fluid Mechanics
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The critical flow condition in a channel is given by [Note: $\alpha$ – kinetic energy correction factor; $Q$ – discharge; $A_c$ – cross-sectional area of flow at critical flow condition; $T_c$ – top width of flow at critical flow condition; $g$ – acceleration due to gravity]
- GATE CE - 2023
- Fluid Mechanics
- Open Channel Flow
Questions Asked in GATE CE exam
Consider a five-digit number PQRST that has distinct digits P, Q, R, S, and T, and satisfies the following conditions:
1. \( P<Q \)
2. \( S>P>T \)
3. \( R<T \)
If integers 1 through 5 are used to construct such a number, the value of P is:
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- Given the following data for a hydraulic jump, determine the power loss (in kW):
Given: - \( B = 5 \, \text{m} \) - \( Q = 15 \, \text{m}^3/\text{sec} \) - \( y_1 = 0.5 \, \text{m} \) - \( g = 9.81 \, \text{m/s}^2 \) - \( \rho_w = 1000 \, \text{kg/m}^3 \) - \( \alpha = 1.0 \) - Find Power loss in kW- GATE CE - 2025
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