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dc.contributor.authorRalston, David K.
dc.contributor.authorGeyer, W. Rockwell
dc.contributor.authorWarner, John C.
dc.date.accessioned2012-11-28T19:34:18Z
dc.date.available2014-10-22T08:57:23Z
dc.date.issued2012-10-17
dc.identifier.citationJournal of Geophysical Research 117 (2012): C10013en_US
dc.identifier.urihttp://hdl.handle.net/1912/5585
dc.descriptionAuthor Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 117 (2012): C10013, doi:10.1029/2012JC008124.en_US
dc.description.abstractAnalyses of field observations and numerical model results have identified that sediment transport in the Hudson River estuary is laterally segregated between channel and shoals, features frontal trapping at multiple locations along the estuary, and varies significantly over the spring-neap tidal cycle. Lateral gradients in depth, and therefore baroclinic pressure gradient and stratification, control the lateral distribution of sediment transport. Within the saline estuary, sediment fluxes are strongly landward in the channel and seaward on the shoals. At multiple locations, bottom salinity fronts form at bathymetric transitions in width or depth. Sediment convergences near the fronts create local maxima in suspended-sediment concentration and deposition, providing a general mechanism for creation of secondary estuarine turbidity maxima at bathymetric transitions. The lateral bathymetry also affects the spring-neap cycle of sediment suspension and deposition. In regions with broad, shallow shoals, the shoals are erosional and the channel is depositional during neap tides, with the opposite pattern during spring tides. Narrower, deeper shoals are depositional during neaps and erosional during springs. In each case, the lateral transfer is from regions of higher to lower bed stress, and depends on the elevation of the pycnocline relative to the bed. Collectively, the results indicate that lateral and along-channel gradients in bathymetry and thus stratification, bed stress, and sediment flux lead to an unsteady, heterogeneous distribution of sediment transport and trapping along the estuary rather than trapping solely at a turbidity maximum at the limit of the salinity intrusion.en_US
dc.description.sponsorshipThis research was funded by a grant from the Hudson River Foundation (#002/07A). D.R. was partially supported by the Office of Naval Research (N00014-08-1-0846).en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttp://dx.doi.org/10.1029/2012JC008124
dc.subjectEstuarine turbidity maximumen_US
dc.subjectLateral sediment distributionen_US
dc.subjectSalinity frontsen_US
dc.subjectSediment fluxen_US
dc.subjectSediment trappingen_US
dc.subjectStratificationen_US
dc.titleBathymetric controls on sediment transport in the Hudson River estuary : lateral asymmetry and frontal trappingen_US
dc.typeArticleen_US
dc.description.embargo2013-04-17en_US
dc.identifier.doi10.1029/2012JC008124


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