Question

Which hydraulic jump is used in abysmal fan formation?

(a) Shallow fluid

(b) Internal wave

(c) External wave

(d) Atmospheric

The question was posed to me by my college director while I was bunking the class.

This intriguing question comes from Types of Hydraulic Jumps in chapter Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

Right answer is (b) Internal wave

Easiest explanation: Hydraulic jump is not possible when the initial speed is less than the critical speed. There is a transition that is created during the change. The transition appears as an undulating wave. Turbidity currents result in internal hydraulic jumps.