assessment of u.s. corps aerators in the san joaquin river for the port of stockton
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Assessment of U.S. Corps Aerators in the San Joaquin River for the Port of Stockton. September 2004 Jones & Stokes Russ Brown, Tom Trexler, Megan Robinson. Goals/Objectives. Determine the current level of performance of both aerators - PowerPoint PPT PresentationTRANSCRIPT
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Assessment of U.S. Corps Aerators in the San Joaquin River
for the Port of Stockton
September 2004
Jones & Stokes
Russ Brown, Tom Trexler, Megan Robinson
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Goals/Objectives
• Determine the current level of performance of both aerators
• Estimate the oxygen loads from the aerators and the oxygen transfer efficiency
• Compare aerator performance to release of oxygen gas from jets and different aerator device (Biox Hose)
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View of Aerator Dock
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Measurement Efforts
• Measurements in Front of North Jets while Operating Both Aerators
• Measurements in Front of South Jets while using Oxygen Gas
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Measurements and Estimations
• Measured Velocity and DO concentrations of upwelling and/or flow-away currents
• Estimated flow-away or upwelling width and calculated flows
• Estimated Oxygen Loads from upwelling or flow-away flows and DO pick-up (measured DO minus background DO)
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Operation of Both Aerators
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0.0
1.0
2.0
3.0
4.0
0.0 0.5 1.0 1.5 2.0
Average Velocity (ft/s)
Dep
th (
ft)
0 ft 5 ft North 10 ft North 15 ft North
0.0
1.0
2.0
3.0
4.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Average Dissolved Oxygen (mg/l)
Dep
th (
ft)
0 ft 5 ft North 10 ft North 15 ft North
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Operation of South Jets with Pure Oxygen Gas
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0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
-5 0 5 10 15 20
Distance from Jets (ft)
Av
era
ge
Ve
loc
ity
(ft/
s)
South of Jets (5 ft) Centerline North of Jets (5 ft)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
-5 0 5 10 15 20
Distance from Jets (ft)
Av
era
ge
DO
(m
g/l)
South of Jets (5 ft) Centerline North of Jets (5 ft)
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Summary
Both Aerators• DO Pick-up of 0.78
mg/l (Back. DO = 3.2 mg/l)
• Total Flow-away Flow of 90 cfs
• Total Oxygen Supply Rate of 402 lbs/day (assuming 40 ft flow-away width)
South Jets with Oxygen• DO Pick-up of 2.19
mg/l (Back. DO = 2.9 mg/l)
• Avg. Upwelling Flow of 191 cfs
• Avg. Oxygen Supply Rate of 2270 lbs/day
• Oxygen Transfer Efficiency of 45%