A hydraulic jump is formed when 

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UPPSC AE Civil 2013 Official Paper II
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  1. a subcritical flow meets a supercritical flow.
  2. a subcritical flow meets a subcritical flow.
  3. a supercritical flow meets a supercritical flow.
  4. a supercritical flow meets a subcritical flow.

Answer (Detailed Solution Below)

Option 4 : a supercritical flow meets a subcritical flow.
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Answer:

The hydraulic jump occurs when there is a transition from supercritical flow to subcritical flow and its an example of rapidly varied flow where the flow properties change in a short reach.

Explanation:

Steady and Unsteady flow:

When the flow properties (such as velocity, density, etc.) do not change with respect to the time it is called steady flow and vice versa

Uniform and Non-uniform flow:

When the flow properties (such as velocity, density, etc.) do not change with respect to space i.e. along with the flow, it is called uniform flow and vice versa.

Varied flow:

When the flow properties (such as velocity, density, etc.) change with respect to space i.e. along with the flow, it is called varied flow.

Depending upon the changes it can be either gradually or rapidly varied flow.

F1 N.M Madhu 03.04.20 D1

Important Note:

F1 N.M Madhu 03.04.20 D2

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