Design of Stepped Spillway
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Transcript of Design of Stepped Spillway
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A Stepped Spillway Preceded by aSupercritical Flow Channel
aro u y rau c ng neer
Sacramento District Corps of Engineers
June 14, 2011
US Army Corps of Engineers
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Dam SafetyDam Safety
Capacity
Capacity
Flood Protection D/S Levee Capacity Flood Protection D/S Levee Capacity
160,000 cfs Lower Outlets 25,000 cfs160,000 cfs Lower Outlets 25,000 cfs
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Main DamMain Dam
Structure
Structure
illwillwChute
Chute
pproacChannel
pproacChannel
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Chute
Chute
Stepped
Chute
Stepped
ChutetillintillinBasin
Basin
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CORPS CONSTRUCTED DAM IN 1950S
DAM TURNED OVER RECLAMATIONHYDROPOWER AND WATER SUPPLY
RECENTY HISTORY CORPS
REDUCTION CAPABILITY OF DAM;
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CORPS MODS TO MAIN DAM PROJECT
USBR FUSE PLUG SPILLWAY INCL
DAM EMBANKMENT AND FOLSOM
CORPS BEST ALT FOR MODS PROJ
AUX SPWY WITH SUBMERGED GATE;SAME ALIGNMENT AS FUSE PLUG
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PMF Q = 320K CFS; FC DESIGN Q =
LIMITED SPACE FOR AUXILIARY; 6 34 23
SUBMERGED (BY 100 +) TAINTER;
CHUTE WIDTH = 169; HIGH UNIT Q
q = 800 (DES) AND 1900 (PMF) CFS/FT
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2100 LONG CONCRETE LINED,
BASED ON ROCK LINE RESULTED IN
V = 67 FPS FOR 135k CFS & 80 /SEC
320OF CHUTE
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Stepped Spillway inSupercritical Spillway Chute
(135,000 cfs)
(320,000 cfs)
c s
78 ft/sec - Max
,
84 ft/sec - Max
3.7 - Froude #
10.8 ft - Depth
. -
23.2 ft - Depth
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STEPPED CHUTE U/S OF A STILLING
CONVENTIONAL PARABOLIC DROP /
COMPARATIVE COSTS.
BASED ON A PARABOLIC DROP EQ.
STEP HEIGHTS VARY FROM ABOUT0.8 AT U/S END TO 3 (MOST ARE 3)
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Stepped Spillway inSupercritical Spillway Chute
Y=0.02*X+0.000472406*X2S=0.02
1V:2.483555158H
Stilling
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INTERACTION OF STEPS AND BASIN
ABRASION OF STEPS NEED FOR ADDED AERATION
LOADINGS FOR STRUCTURAL DESIGN
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MODELS HELPADDRESS CONCERNS
USBR 1:48 SCALE PHYSICAL MODEL
USBR CFD (FLOW-3D) ALDEN LABS CHECK OF CFD RESULTS
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SAFL 1:26 SCALE MODEL
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= ,
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Q = 135,000 cfsQ = 135,000 cfs
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Q = 322,000Q = 322,000 cfscfs
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Profile of Stepped Spillway
340
Velocit Profile
280
300
320
@ Step 0 Velocity Profile@ Step 32
240
260
tio
n,
feet
V l i Pr fil
180
200Eleva
@ Step 61
120
140
160
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31+00 32+00 33+00 34+00 35+00 36+00 37+00 38+00 39+00 40+00
Station, feet
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135 000 CFS VELOCITIES10
12
8
Step 0_5
Step 0_4
Step 0_3
Step 0_2
Step 0_1
6
Depth
(ft)
ep _
Step 32_4
Step 32_3
Step 32_2
Step 32_1Step 61_5
4
Step 61_4
Step 61_3
Step 61_2
Step 61_1
0
2
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35 45 55 65 75 85 95 105 115
Velocity (ft/sec)
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,25
Step 0_5
Ste 0 4
20
_
Step 0_3
Step 0_2Step 0_1
Step 32_5
Step 32_4
15
Depth
(ft) Step 32_3
Step 32_2
Step 32_1
Step 61_5
Step 61_4
10ep _
Step 61_2
Step 61_1
0
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40 50 60 70 80 90 100 110 120 130 140
Velocity (ft/sec)
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SAFL ENERGY LOSS
Discharge
EnergyLoss
SpillwayEnergy Loss
Stilling Basin
Energy Loss
22,508 93% - -
- -
113,049 83% - -
,158,249 78% - -
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301,710 67% 34% 33%
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ENERGY LOSS
CONFIRMATIONS
USBR CFD MODEL
:
CFD MODEL AT ALDEN LABS
ANALYTICAL COMPS ABOUT 10% LOWERTHAN OTHERS
MODELS WERE CLOSE.
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Design Flow (135,000 cfs)
Velocity (ft/s)
Pressure (psi)
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Design Flow (135,000 cfs)
Velocity (ft/s)
Pressure (psi)
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Design Flow (135,000 cfs)
Velocity (ft/s)
Pressure (psi)
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Test section for atmospheric
work on laboratory floor.
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PIV data (large steps-slope
0.4)Step 4 velocity Step 14 velocity
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= .
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= .
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INTERACTION OF STEPS AND BASIN
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MODELING
NOT FULLY ADDRESSED - -
NEED FOR ADDED AERATION
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