Use Of Routing Procedure To Study Dye And Gas Transport In The West Fork Trinity River, Texas
Date
1984
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Abstract
Rhodamine-WT dye, ethylene, and propane were injected
at three sites along a 21.6-kilometer reach of the
West Fork Trinity River below Fort Worth, Texas. Complete
dye concentration versus time curves and peak gas concentrations
were measured at three cross sections below each
injection. The peak dye concentrations were located and
samples were collected at about three-hour intervals for as
many as six additional cross sections. These data were
analyzed to determine the longitudinal dispersion coefficients
as well as the gas desorption coefficients using both
standard techniques and a numerical routing procedure.
The routing procedure, using a Lagrangian transport
model to minimize numerical dispersion, provided better
estimates of the dispersion coefficient than did the method
of moments. At a steady flow of about 0.76 m3/s, the dispersion
coefficient varied from about 0.7 m2/s in a reach contained
within a single deep pool to about 2.0 m2/s in a reach
containing riffles and small pools.
The bulk desorption coefficients computed using the
routing procedure and the standard peak method were essentially
the same. The liquid film coefficient could also be
obtained using the routing procedure. Both the bulk desorption
coefficient and the liquid film coefficient were
much smaller in the pooled reach than in the reaches containing
riffles.
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Keywords
Routing Procedure, Study Dye, Gas Transport, West Fork Trinity River, Texas