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<br />0: <br />W <br />t- <br />:J <br />0: <br />W <br />a, <br />'" <br />::I: <br /><I; <br />0: <br />Cl <br />o <br />0: <br />o <br />~ <br />:;; <br />Z <br />o <br />>= <br /><I; <br />0: <br />t- <br />Z <br />W <br />o <br />z <br />o <br /><.l <br />w <br />> <br />o <br /> <br />Measured and Predicted Velocity and Longitudinal Dispersion at Steady and Unsteady Flow, <br />Colorado River, Glen Canyon Dam to Lake Mead <br /> <br />o <br /> <br />20 <br /> <br />HOURS AFTER INJECTION <br />40 60 80 <br /> <br />100 <br /> <br />120 <br /> <br />Distance <br />From <br />Injection <br />(kilometero) <br /> <br />15 <br /> <br />Nautiloid <br /> <br />10 <br /> <br />Little <br />Colorado <br /> <br />Nevill's <br />Mile '18 <br /> <br />Average <br />Velocity <br />(meters <br />per oecond) <br /> <br />57.7 <br />98.3 <br />123.2 <br />189.3 <br />267.9 <br />380.5 <br /> <br />57.7 <br />98.3 <br />123.2 <br />189.3 <br />267.9 <br />343.6 <br />380.5 <br /> <br />National <br /> <br />Pumpkin <br /> <br />1.2 <br />.61 <br />1.0 <br />1.3 <br />.93 <br />1.2 <br /> <br />0.87 <br />.75 <br />1.1 <br />.97 <br />1.1 <br />1.1 <br />1.0 <br /> <br />"NA, not available, <br /> <br />5 <br /> <br /> <br />o <br /> <br />20 <br /> <br />21 <br /> <br />25 <br /> <br />MAY 1991 <br /> <br />Figure 4. Variation afDye Concentration with Time at Sampling Sites, Steady-Flow Traveltime <br />Measurement, Grand Canyon Reach, May 20-25, 1991. <br /> <br />TABLE 3. Statistics of the Time-Concentration Curves for the Grand Canyon Reach Measurements, May 1991. <br />[Discharge for the unsteady-flow measurement is the mean at the Bite for the period of passage of the <br />dye cloud. Average velocity was computed 88 velocity of the centroid of the time-concentration curve.] <br /> <br />Diocharge <br />(cubic <br />meters per <br />second) <br /> <br />MBlrlmum <br />Concentration <br />CmicrogralD8 <br />per liter) <br /> <br />Time <br />Variance <br />(houro <br />equared) <br /> <br />Coefficient <br />of Skew <br /> <br />Time After Injection <br />(houro) <br />Peak Centroid <br /> <br />Un.teady-Flo'W Measurement, May 8~11, 1991 <br /> <br />362 <br />336 <br />(*) <br />(*) <br />(*) <br />(*) <br /> <br />18.1 <br />13.4 <br />10.9 <br />9.97 <br />9.74 <br />8.11 <br /> <br />13.8 <br />32.3 <br />39.0 <br />53.0 <br />76.5 <br />101.7 <br /> <br />14.3 <br />31.2 <br />38.0 <br /> <br />1.60 <br />9.31 <br />6.35 <br /> <br />0.805 <br />-.111 <br />-.526 <br /> <br />103.6 <br /> <br />14.3 <br /> <br />.658 <br /> <br />Steady-Flow Mea.ouremenl, May 20-25.1991 <br /> <br />425 <br />425 <br />430 <br />433 <br />436 <br />436 <br />436 <br /> <br />12.5 <br />8.34 <br />8.33 <br />6.91 <br />6.03 <br />5.34 <br />5.32 <br /> <br />18.5 <br />33.1 <br />39.3 <br />58.6 <br />79.0 <br />98.3 <br />107.5 <br /> <br />18.5 <br />33.5 <br />39.9 <br />58.8 <br />79.0 <br />98.4 <br />108.3 <br /> <br />l.48 <br />4.16 <br />4.49 <br />5.25 <br />6.23 <br />8.10 <br />9.36 <br /> <br />1.161 <br />.543 <br />.505 <br />.290 <br />.251 <br />.368 <br />.253 <br /> <br />concentration, Cp, to traveltime of the peak concen- <br />tration, Tp, with an equation of the form Cp = aTpb. <br />The exponent obtained, ...{}.50, indicates a slower rate <br />of decrease in peak concentration than is typical, but <br /> <br />it is about the rate that would be expected if the one- <br />dimensional mixing theory holds (Nordin and Sabol, <br />1974). Peak concentrations were higher during the <br />unsteady-flow measurement because of the greater <br /> <br />273 <br /> <br />WATER RESOURCES BULLETIN <br /> <br />~"1<r <br />f:...hl <br />'.' I. <br />~' .. <br /> <br />.. .f <br /> <br />'~f:'1:. <br /> <br />;:.. .~ <br />" <br />,: '. <br /> <br />;t'J:~ <br /> <br />. ~ - ,~; <br /> <br />,. <br /> <br />I <br /> <br />....... <br /> <br />;'.- <br /> <br />~.(:.:~ <br /> <br />.... <br />