WSP11681

• File Number: 8220.101.17
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 4/1/1995
• Title: Measured and Predicted Velocity and Longitudinal Dispersion at Steady and Unsteady Flow / Colorado River / Glen Canyon Dam to Lake Mead
• Water Supply Pro - Doc Type: Report/Study

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Measured and Predicted Velocity and Longitudinal Dispersion at Steady and Unsteady Flow, : ,.:''t~~
Colorado River, Glen Canyon Dam to Lake Mead ',. ~ I
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DISTANCE DOWNSTREAM FROM INJECTION. IN KILOMETERS
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EXPLANATION ~~~:~~~~~
STEADY RELEASE . LOW-FLUCTUATING FLOW
".1':' .:- .c~
+ 226 cubic meters per second ALTERNATIVE (see fig. 10)
+ 425 cubic meters per second 0 HIGH.FLUCTUATING FLOW
+ 850 cubic meters per second ALTERNATIVE (see fig. 10)

Figure 11. Relation of Unit-Peak Solute Concentration (top), Solute-Cloud Duration (middle), and Velocity
of Peak Solute Concentration (bottom) Estimated by a Solute-Transport Model to Distance
Downstream for Three Steady and Two Unsteady Dam Releases, Grand Canyon Reach.

that eddies can explain the observed increase in dis-
persion, because eddies are not as important a feature
in the Glen Canyon reach as they are in the Grand
Canyon reach because of differences in channel geom-
etry and in sand supply in the two reaches.

The major conclusion s of this study are as follows:

. The relation of peak concentration, dye-cloud
variance, and dye-cloud duration to traveltime of the
dye-cloud peak shows that longitudinal dispersion in

279

WATER RESOURCES BULLETIN