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dc.contributor.authorScully, Malcolm E.
dc.contributor.authorFriedrichs, Carl T.
dc.date.accessioned2010-12-02T14:34:15Z
dc.date.available2010-12-02T14:34:15Z
dc.date.issued2007-06
dc.identifier.citationJournal of Physical Oceanography 37 (2007): 1496-1511en_US
dc.identifier.urihttp://hdl.handle.net/1912/4149
dc.descriptionAuthor Posting. © American Meteorological Society, 2007. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 37 (2007): 1496-1511, doi:10.1175/jpo3071.1.en_US
dc.description.abstractMeasurements collected in the York River estuary, Virginia, demonstrate the important impact that tidal and lateral asymmetries in turbulent mixing have on the tidally averaged residual circulation. A reduction in turbulent mixing during the ebb phase of the tide caused by tidal straining of the axial density gradient results in increased vertical velocity shear throughout the water column during the ebb tide. In the absence of significant lateral differences in turbulent mixing, the enhanced ebb-directed transport caused by tidal straining is balanced by a reduction in the net seaward-directed barotropic pressure gradient, resulting in laterally uniform two-layer residual flow. However, the channel–shoal morphology of many drowned river valley estuaries often leads to lateral gradients in turbulent mixing. Tidal straining may then lead to tidal asymmetries in turbulent mixing near the deeper channel while the neighboring shoals remain relatively well mixed. As a result, the largest lateral asymmetries in turbulent mixing occur at the end of the ebb tide when the channel is significantly more stratified than the shoals. The reduced friction at the end of ebb delays the onset of the flood tide, increasing the duration of ebb in the channel. Conversely, over the shoal regions where stratification is more inhibited by tidal mixing, there is greater friction and the transition from ebb to flood occurs more rapidly. The resulting residual circulation is seaward over the channel and landward over the shoal. The shoal–channel segregation of this barotropically induced estuarine residual flow is opposite to that typically associated with baroclinic estuarine circulation over channel–shoal bathymetry.en_US
dc.description.sponsorshipSupport for this research was provided by the National Science Foundation Division of Ocean Sciences Grant OCE- 9984941.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttp://dx.doi.org/10.1175/jpo3071.1
dc.subjectTidesen_US
dc.subjectOcean circulationen_US
dc.subjectEstuariesen_US
dc.subjectTurbulenceen_US
dc.titleThe importance of tidal and lateral asymmetries in stratification to residual circulation in partially mixed estuariesen_US
dc.typeArticleen_US
dc.identifier.doi10.1175/jpo3071.1


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