Turbulent momentum and salt transport in the mixing zone of the Elbe estuary.

Schröder, M. and Siedler, Gerold (1989) Turbulent momentum and salt transport in the mixing zone of the Elbe estuary. Estuarine, Coastal and Shelf Science, 28 (6). pp. 615-638. DOI 10.1016/0272-7714(89)90050-4.

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Abstract

Measurements in the mixing zone of the Elbe estuary were performed during three consecutive tidal cycles with three types of instruments—a moored tripod with velocity and temperature/conductivity/light attenuation sensors, a profiling sonde with similar sensors lowered from an anchored vessel, and instrumented moorings. Acoustic-travel-time sensors were used for velocity measurements.

Spectral analysis of 12·8 min pieces of the obtained time series gives results that are consistent with isotropic turbulence for part of the frequency space. Temporal changes of turbulent kinetic energy are correlated with tidal current velocity. A retardation is found between changes in tidal current and turbulent energy. Not all shear stress terms are in similar phase with tidal flow. Mean gradients, Reynolds stress terms, and turbulent salt flux terms are combined to determine eddy viscosity and eddy diffusion coefficients.

Document Type: Article
Keywords: turbulence spectra; eddy viscosity; eddy diffusivity; acoustic turbulence meters; tidal flow; mixing zone; Elbe estuary
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/0272-7714(89)90050-4
ISSN: 0272-7714
Date Deposited: 25 Sep 2012 12:28
Last Modified: 04 Jan 2017 10:49
URI: http://oceanrep.geomar.de/id/eprint/15386

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