53:071 Principles of Hydraulics
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53:071 Principles of Hydraulics Laboratory Experiment #3 Analysis of Open-Channel Flow Transitions Using Specific Energy Diagram. Li-Chuan Chen, Marian Muste, and Larry Weber. Objective. To observe the changes in the behavior of the free surface when subjected to changes in the channel bed.

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53:071 Principles of HydraulicsLaboratory Experiment #3Analysis of Open-Channel Flow Transitions Using Specific Energy Diagram

Li-Chuan Chen, Marian Muste, and Larry Weber


Objective
Objective

  • To observe the changes in the behavior of the free surface when subjected to changes in the channel bed.




Apparatus flume
Apparatus — Flume


Apparatus obstruction

ybump (ft)

0.24

x (ft)

5

5.87

6.96

7.78

Apparatus — Obstruction

For x  5 ybump = 0

For 5 < x  5.87 ybump = 0.276x – 1.38

For 5.87 < x  6.96 ybump = 0.24

For 6.96 < x  7.78 ybump = 2.28 - 0.293x

For x > 7.78 ybump = 0


What are we going to do
What are we going to do?

  • We are going to measure the water surface elevation along a open channel.


Procedures
Procedures

  • Establish a stabilized discharge in the system.

  • Measure the water level difference on the differential manometer for computing discharge.

  • Measure the water surface elevation upstream, above, and downstream of the obstruction.

  • Change the flow rate and repeat Step 2 and 3 for another flow condition.

  • Observe the ripples formed at the tip of the point gage.


Data sheet

Flow Situation I

Flow Situation II

h= (ft); Q = (cfs); yc1= (ft)

h= (ft); Q = (cfs); yc1= (ft)

Track

(ft)

Water Surface Elevation (ft)

Bump

Geometry (ft)

Actual depth

(ft)

Track (ft)

Water Surface Elevation (ft)

Bump

Geometry (ft)

Actual depth

(ft)

Data Sheet


Analysis
Analysis

  • Plot the water surface elevation in the vicinity of the channel transition.

  • Construct the specific energy diagram using the measured data.

  • Compare theoretical specific energy diagrams with the experimental curves.

  • Comment on the flow behavior in the two flow situation.


Sample result water surface profile
Sample Result — Water Surface Profile



Further considerations
Further Considerations

  • What are the main assumptions associated with the use of the specific energy diagram?

  • Comment on the differences noticed on the ripples produced by the point gage upstream and downstream the obstruction.

  • Analyze the water surface behavior for the same unit discharges used in your experiment hypothesizing the flow enters in the obstruction as supercritical flow.


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