The influence of lateral advection on the residual estuarine circulation : a numerical modeling study of the Hudson River Estuary Scully, Malcolm E. Geyer, W. Rockwell Lerczak, James A. 2010-10-26T19:01:17Z 2010-10-26T19:01:17Z 2009-01
dc.description Author Posting. © American Meteorological Society, 2009. 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 39 (2009): 107-124, doi:10.1175/2008JPO3952.1. en_US
dc.description.abstract In most estuarine systems it is assumed that the dominant along-channel momentum balance is between the integrated pressure gradient and bed stress. Scaling the amplitude of the estuarine circulation based on this balance has been shown to have predictive skill. However, a number of authors recently highlighted important nonlinear processes that contribute to the subtidal dynamics at leading order. In this study, a previously validated numerical model of the Hudson River estuary is used to examine the forces driving the residual estuarine circulation and to test the predictive skill of two linear scaling relationships. Results demonstrate that the nonlinear advective acceleration terms contribute to the subtidal along-channel momentum balance at leading order. The contribution of these nonlinear terms is driven largely by secondary lateral flows. Under a range of forcing conditions in the model runs, the advective acceleration terms nearly always act in concert with the baroclinic pressure gradient, reinforcing the residual circulation. Despite the strong contribution of the nonlinear advective terms to the subtidal dynamical balance, a linear scaling accurately predicts the strength of the observed residual circulation in the model. However, this result is largely fortuitous, as this scaling does not account for two processes that are fundamental to the estuarine circulation. The skill of this scaling results because of the compensatory relationship between the contribution of the advective acceleration terms and the suppression of turbulence due to density stratification. Both of these processes, neither of which is accounted for in the linear scaling, increase the residual estuarine circulation but have an opposite dependence on tidal amplitude and, consequently, strength of stratification. en_US
dc.description.sponsorship This research was supported by the Beacon Institute for Rivers and Estuaries—Woods Hole Oceanographic Institution postdoctoral fellowship program, as well as NSF Grants OCE-0452054 and OCE-0451740. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Physical Oceanography 39 (2009): 107-124 en_US
dc.identifier.doi 10.1175/2008JPO3952.1
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.subject Advection en_US
dc.subject Estuarine circulation en_US
dc.subject Friction en_US
dc.subject Density currents en_US
dc.subject Baroclinic flows en_US
dc.title The influence of lateral advection on the residual estuarine circulation : a numerical modeling study of the Hudson River Estuary en_US
dc.type Article en_US
dspace.entity.type Publication
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relation.isAuthorOfPublication.latestForDiscovery 0b665fcc-025c-4b03-aae9-d61bbeb030c9
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