Abstract

Within a partially mixed estuary both the tidal and the nontidal density-induced circulation exhibits substantial vertical shear. The interaction of this current shear with turbulent mixing across the vertical density gradient contributes to the longitudinal (alongstream) spread of a contaminant introduced into the estuary. A dye tracer experiment conducted in the lower York River Estuary provides abundant evidence for the importance of this "shear effect" to longitudinal dispersion....

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