The Hydraulic Jump
Today we are going to demonstrate the hydraulic jump. ... The hydraulic jump is an openchannel flow phenomenon by which the flow passes suddenly from supercritical upstream of the jump, to subcritical downstream. .... The hydraulic jump is formed in a horizontal channel when the headwater condition is sufficiently low and the tailwater condition is sufficiently high. ... The hydraulic jump always occurs with a loss of energy. ...
The formula for the energy loss is:
...
We turn on the pump. .... We set the bed slope close to zero and check the level [Point to the level]. ... We raise the downstream water level until the hydraulic jump is established. [Wait to the jump to form] ... Now we move the gage upstream to measure the upstream depth.
... [Point to the gage] Note that the point gage is at zero at the bottom of the flume. ... We measure the upstream depth. ... The upstream depth is: y_{1} mm. ... Now we move the gage downstream to measure the downstream depth. ... [Point to the gage] Note that the point gage is at zero at the bottom of the flume.
... We measure the downstream depth. ... The downstream depth is: y_{2} mm ...
The energy loss due to the jump is:
...
