15.1.5. Disturbances in Flow

Try these first

1. 1.

   What is the Froude number?

   Hint

   Think about how we measure flow dynamics.

2. 2.

   Define subcritical flow.

   Hint

   What happens when the Froude number is less than one?

3. 3.

   What classifies flow as subcritical?

   • Froude number < 1
   • Froude number = 1
   • Froude number > 1

   Hint

   Think about the relationship between gravity and inertia.

4. 4.

   True or False: Disturbances in supercritical flow propagate upstream.

   • True
   • False

   Hint

   Consider how wave speed is affected by flow regime.

5. 5.

   A river has an average velocity of 4 m/s and a depth of 2 m. Determine the Froude number and categorize the flow.

   Hint

   Use the Froude number formula.

6. 6.

   How would the introduction of a dam influence flow regime transitions in a river?

   Hint

   Think about how energy changes with depth.