Effect of tides on solute flushing from a strait: Imaging flow and transport in the east river with SF6

Theodore Caplow, Peter Schlosser, David T. Ho, Rica C. Enriquez

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In June 2003, two injections of ∼3.9 mol of sulfur hexafluoride (SF6) were made 8 days apart in the East River, a 25 km tidal strait, to observe solute mixing and dissipation. The first injection occurred at slack before flood, and the second at slack before ebb (flood = northward flow). Tidally synchronized surveys of the SF6 tracer patch, supplemented by vertical profiles, were conducted by boat for 6 and 4 days following the flood and ebb injections, respectively. Residence times for the tracer-tagged water mass in the East River were estimated to be 3.3 ± 0.7 days and 1.7 ± 0.5 days for the flood and ebb injections, respectively, after correcting SF6 inventories for losses of SF6 from the water column by air-water gas exchange. The data indicate that the majority of East River solutes are transported to New York Harbor and that tidal mixing dominates subtidal circulation with respect to solute transport. Surveys of the adjacent lower Hudson River revealed a northward-moving, intermediate layer of East River water. Our results suggest that tidal phasing of contaminant discharges in the East River could reduce environmental impacts, by increasing flushing rates and directing a greater fraction of material away from Long Island Sound.

Original languageEnglish (US)
Pages (from-to)4562-4571
Number of pages10
JournalEnvironmental Science and Technology
Volume38
Issue number17
DOIs
StatePublished - Sep 1 2004
Externally publishedYes

Fingerprint

Tides
flushing
strait
solute
tide
Rivers
Imaging techniques
river
Water
tracer
Sulfur Hexafluoride
Sulfur hexafluoride
Solute transport
solute transport
gas exchange
vertical profile
water mass
Boats
river water
Ports and harbors

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Effect of tides on solute flushing from a strait : Imaging flow and transport in the east river with SF6. / Caplow, Theodore; Schlosser, Peter; Ho, David T.; Enriquez, Rica C.

In: Environmental Science and Technology, Vol. 38, No. 17, 01.09.2004, p. 4562-4571.

Research output: Contribution to journalArticle

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