Question

A rectangular channel with Gradually Varied Flow (GVF) has a changing bed slope. If the change is from a steeper slope to a steep slope, the resulting GVF profile is

• A. S\(_3\)
• B. S\(_1\)
• C. S\(_2\)
• D. either S\(_1\) or S\(_2\), depending on the magnitude of the slopes

Hint:

When analyzing Gradually Varied Flow, use the profiles S\(_1\), S\(_2\), and S\(_3\) to determine the impact of changes in bed slope on the flow pattern.

Answer 1

The Correct Option is A

In Gradually Varied Flow (GVF), the flow profile changes based on the bed slope. When the bed slope changes from a steeper slope to a less steep one, the resulting GVF profile is typically represented by S\(_3\), indicating a gradual transition in flow. The GVF profile associated with this transition corresponds to S\(_3\).

Step 1: Understand the profile types.
The profiles S\(_1\), S\(_2\), and S\(_3\) describe different types of flow profiles based on the slope change. S\(_3\) is typically the profile that occurs when the slope changes from steeper to less steep.

Step 2: Identify the correct profile.
The correct profile for a change from a steeper slope to a less steep slope is S\(_3\).

Final Answer: (A) S\(_3\)