Question

Specific energy in GVF changes only under which of the following conditions.

(a) Difference between bed slope and slope of energy line

(b) Both bed slope and energy slope are equal

(c) Presence of bed slope alone

(d) Presence of energy slope alone

This question was posed to me in unit test.

I want to ask this question from Gradually Varied Flow(GVF) topic in chapter Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

Right choice is (a) Difference between bed slope and slope of energy line

To elaborate: We know that  ^dE⁄dx = S0 – Sf

Hence if there’s a difference between bed slope and energy slope specific energy changes.