Tidally induced turbulence and suspended sediment

Souza, Alejandro J.; Alvarez, Luis G.; Dickey, Tommy D.. 2004 Tidally induced turbulence and suspended sediment. Geophysical Research Letters, 31 (20). L20309.

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Nearly continuous data collected using novel methods are utilized to advance the understanding of turbulence and suspended particulate matter (SPM) dynamics under strong tidal flow conditions. Key instrumentation includes a single acoustic current profiler that provides nearly continuous, concurrent turbulence and SPM information with respect to depth near the seafloor and within the water column. Observations show a lag of about 1 hour in turbulence production between the bottom and 12 meters above the bottom (mab), and of about 1.5 hours for SPM. Estimates of eddy viscosity show values ranging between 10−3 and 10−2 m2 s−1, with an almost constant mean value of 3.5 × 10−3 m2 s−1 within the bottom 7 meters. The present observations and a previously reported theory show good agreement in both amplitude and phase for SPM and turbulence, when values of eddy viscosity ranging between 3.5 × 10−3 (mean) and 10−2 (maximum) are used. Our data set is valuable for evaluating, developing, and improving turbulence and SPM numerical models.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: POL Programmes > Shallow coastal seas - function and impacts of change > Process experiments at small scale
POL Programmes
ISSN: 0094-8276
Additional Keywords: Turbulence, diffusion, and mixing Sediment transport shelf sea dynamics Benthic Boundary Layer
NORA Subject Terms: Marine Sciences
Date made live: 18 Jul 2013 10:56 +0 (UTC)

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