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Open Channel Hydraulics Specific Energy

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Open Channel Hydraulics Specific Energy & Discharge Control Structures Environmental Hydrology Lecture 13 Potential and Kinetic Energy in Open Channels Specific ... – PowerPoint PPT presentation

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Title: Open Channel Hydraulics Specific Energy


1
Open Channel HydraulicsSpecific Energy
Discharge Control Structures
  • Environmental Hydrology
  • Lecture 13

2
Potential and Kinetic Energy in Open Channels
energy grade line
Velocity head
V12 / 2g
V22 / 2g
Pressure of fluid column (P rgy gy)
H1
Water surface
y1
y2
Elevation above datum
Z1
Z0 (datum)
Z2
Total head (H) Z P/g v2/2g Bernoulli
equation
3
Specific Energy
See also Ward Trimble, Fig 8.1
Specific energy (E) y v2/2g
4
Froude Number
Fr v vg y
Fr lt 1 subcritical flow Fr 1 critical flow Fr gt
supercritical flow
where V average velocity g acceleration due
to gravity (9.81m/sec2, 32.2 ft/sec2) y flow
depth
5
Specific Energy
See also Ward Trimble, Fig 8.1
Specific energy (E) y v2/2g
6
Hydraulic Jump
Meatgrinder So. Fork American River Image
source Greg Pasternack, UC Davis
7
Hydraulic Jump
Image Source http//einstein.atmos.colostate.edu/
mcnoldy/HydraulicJump.htm l
8
Measuring Discharge
Images U.S. Geological Survey
9
Discharge Control Structures
V-notch weir
Parshall flume
10
Discharge Control Structures
11
Discharge Control Structures
Weir or Flume
Stilling well
12
Weir equations
Ward Trimble, Figure 8.6
Q CLH3/2
where C is a weir coefficient other terms
defined in illustration.
Note weir and flume equations vary by structure
design! See http//www.lmnoeng.com/Weirs/Rectang
ularWeir.htm
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