Residual eddies in a tidal channel |
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| Authors: | C Li S Armstrong D Williams |
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| Institution: | 1. Department of Oceanography and Coastal Sciences, Coastal Studies Institute, School of the Coast and Environment, Louisiana State University, 70803, Baton Rouge, Louisiana
2. Department of Geological Sciences, University of South Carolina, 29208, Columbia, South Carolina
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| Abstract: | Persistent residual eddies in a tidal channel in Wassaw Sound, Georgia, were resolved through shipboard observations. The
residual eddies appear to be linked to bathymetry and coastlines. The semidiurnal tidal constituent, which explains about
90% of the variability of the data, was found to be a standing wave and the tidal wave propagation induced residual flow was
minimal, so the advective nonlinearity was one of the major contributors to the residual eddies. From the vorticity point
of view, if the lateral friction is neglected, three terms contribute to the generation of the relative vorticity in the depth-averaged
vorticity equation. An important fact is that all these terms include the depth function: the interaction between the advection
and bathymetry gradient, the interaction between advection and bathymetry, and the interaction between mean pressure gradient
and the bathymetry gradient. |
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