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There is a free overfall at the end of a long open channel. For a given flow rate, the critical depth is less than the normal depth. What gradually varied flow profile will occur in the channel for this flow rate?
- a)M1
- b)ub>(b) M2
- c)M3
- d)S1
Correct answer is option 'B'. Can you explain this answer?
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There is a free overfall at the end of a long open channel. For a give...
The gradually varied flow profile that will occur in the channel for this flow rate is "M1" or "Mild Slope" profile.
In the M1 profile, the water surface gradually rises from the normal depth upstream of the free overfall to the critical depth at the overfall. Beyond the overfall, the water surface gradually decreases back to the normal depth downstream.
This profile occurs because the critical depth is less than the normal depth, indicating that the flow is supercritical upstream of the overfall. In supercritical flow, the water velocity is greater than the critical velocity, resulting in a gradually rising water surface.
It is important to note that the other option, "ub" or "Uniform flow", would occur if the critical depth was equal to or greater than the normal depth. In uniform flow, the water surface remains at a constant level throughout the channel.
In the M1 profile, the water surface gradually rises from the normal depth upstream of the free overfall to the critical depth at the overfall. Beyond the overfall, the water surface gradually decreases back to the normal depth downstream.
This profile occurs because the critical depth is less than the normal depth, indicating that the flow is supercritical upstream of the overfall. In supercritical flow, the water velocity is greater than the critical velocity, resulting in a gradually rising water surface.
It is important to note that the other option, "ub" or "Uniform flow", would occur if the critical depth was equal to or greater than the normal depth. In uniform flow, the water surface remains at a constant level throughout the channel.
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There is a free overfall at the end of a long open channel. For a give...
Here, yn > yc . So, the mild sloped channel.
For free flow at the end of long channel on the mild sloped surface. There will be draw down and depth of flow decreases from yn tp yc but not below the yc . So, appropriate answer will be M2 only.
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There is a free overfall at the end of a long open channel. For a given flow rate, the critical depth is less than the normal depth. What gradually varied flow profile will occur in the channel for this flow rate?a)M1b)ub>(b) M2c)M3d)S1Correct answer is option 'B'. Can you explain this answer?
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