Comparison of SF6 and fluorescein as tracers for measuring transport processes in a large tidal river

Publication Type  Journal Article
Year of Publication  2006
Authors  Ho, D. T.; Schlosser, P.; Houghton, R. W.; Caplow, T.
Journal Title  Journal of Environmental Engineering-Asce
Volume  132
Issue  12
Pages  1664-1669
Journal Date  Dec
ISBN Number  0733-9372
Accession Number  ISI:000242430500018
Key Words  advection; dispersion; mixing; tracers; dyes; hudson river; tides; longitudinal dispersion coefficients; hudson river; release experiment

We present the first large-scale comparison of a fluorescent dye [fluorescein (C20H10O5Na2)] 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 similar to 4.3 mol of SF6 were injected into the Hudson River at an averaged depth of 9.5 m, similar to 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.


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URL  <Go to ISI>://000242430500018
DOI  Doi 10.1061/(Asce)0733-9372(2006)132:12(1664)