Crowdly

The energy state of the flow can be expressed using the

Reynolds Number

Froude Number

Bernoulli Number

Manning’s number

Flow transitions from a subcritical flow to supercritical flow will result in a hydraulic jump:

The depths either side of a sudden change in channel geometry can be found through “X” of the “Y”.

“X” – Sequent Depths “Y” – Force balance equations

“X” – Subsequent Depths “Y” – Force balance equations

“X”– Subsequent Depths “Y” – Energy balance equations

“X” – Sequent Depths “Y” – Energy balance equations

Across a hydraulic jump there is always a loss in:

Potential energy

Specific energy

Mass balance

Critical energy

Flow transitions from a supercritical flow to subcritical flow will result in a hydraulic jump:>

True

False

When performing an energy analysis we work from the “X” working “Y”.

“X” – upstream point “Y” – downstream

“X” – critical energy point “Y” – outwards

“X” – point of change “Y” – outwards

“X” – downstream point “Y” – upstream

The critical energy of a flow is…

The total energy related to the flow at that point of change

Minimum depth hydrostatic flow energy and velocity flow energy

The minimum specific energy of the flow

The specific head of flow is comprised of:

Elevation head, hydrostatic head and velocity head

hydrostatic head and velocity head

Elevation head and velocity head

Velocity head only

When a channel geometry contracts, we expect a steady flow to “X” and the flow velocity to “Y”:

“X” – Decelerate “Y” - Increase

“X” – accelerate “Y” – Decrease

“X” – Decelerate “Y” – Decrease

X” – accelerate “Y” – Increase