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Sodium and manganese in barnacle shells, collected from habitats with salinities varying from l-

Times series of tidal current velocities were measured at various depths in an estuary with a pivoted vane current meter. The velocity data were analyzed to obtain mean longitudinal (U) and vertical (W) currents along with their respective turbulent fluctuations (u and w). Correlation of the fluctuating components allowed direct measurements of Reynolds stresses, τ = ‐ρ〈uw〉, which ranged from near zero at the surface to about 5 dynes/cm2 close to the bottom (7‐meter depth). Variation of the turbulent kinetic energy q2 with shear stress was found to be approximately linear in cases where comparison was possible. The longitudinal 〈u2〉 and vertical 〈w2〉 components of the turbulent kinetic energy changed differently with depth and were related to tidal phase.

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Intermittent periods of high momentum transport have been measured in a tidal boundary layer (Reϑ ≈ 2.6×105). The data have been interpreted in terms of the bursting phenomenon reported in laboratory experiments. The experimental period between bursts is consistent with that predicted by T ≈ kδ*/U∞ where k is the displacement thickness, and U∞ is the stream velocity outside the boundary layer.

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