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Comparison of SF6 and Fluorescein as Tracers for Measuring Transport Processes in a Large Tidal River
Ist Teil von
Journal of environmental engineering (New York, N.Y.), 2006-12, Vol.132 (12), p.1664-1669
Ort / Verlag
Reston, VA: American Society of Civil Engineers
Erscheinungsjahr
2006
Link zum Volltext
Quelle
EBSCOhost Business Source Ultimate
Beschreibungen/Notizen
We present the first large-scale comparison of a fluorescent dye [fluorescein
(
C20
H10
O5
Na2
)
] and a gas [sulfur hexafluoride
(
SF6
)
] as tracers of advection and longitudinal dispersion from a dual tracer release experiment conducted in the tidal Hudson River. At the beginning of the experiment,
36
kg
of fluorescein and
∼4.3
mol
of
SF6
were injected into the Hudson River at an averaged depth of
9.5
m
,
∼1
m
above the bottom, near Hyde Park, N.Y. After injection, fluorescein distributions were surveyed for 4 days (until it became undetectable) and
SF6
distributions were surveyed for 10 days. The dye resolves initial vertical mixing on the day of injection, and then net advection and longitudinal dispersion, whereas
SF6
provides information on net advection and longitudinal mixing on larger spatial scales and longer time scales. Quantitative estimates of transport processes (net advection and longitudinal dispersion) calculated from the two methods are consistent for the first three days, and start to deviate on the fourth day when the signal-to-noise ratio of the dye deteriorated.