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Li-Chuan Chen, Marian Muste, and Larry Weber

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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 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.
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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