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dc.contributor.authorKumar, Nirnimesh  Concept link
dc.contributor.authorVoulgaris, George  Concept link
dc.contributor.authorList, Jeffrey H.  Concept link
dc.contributor.authorWarner, John C.  Concept link
dc.date.accessioned2014-01-23T20:39:28Z
dc.date.available2014-10-22T08:57:21Z
dc.date.issued2013-10-15
dc.identifier.citationJournal of Geophysical Research: Oceans 118 (2013): 5280–5295en_US
dc.identifier.urihttps://hdl.handle.net/1912/6387
dc.descriptionAuthor Posting. © American Geophysical Union, 2013. 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: Oceans 118 (2013): 5280–5295, doi:10.1002/jgrc.20358.en_US
dc.description.abstractNearshore measurements of waves and currents off Cape Hatteras, North Carolina, U.S.A, are used to investigate depth-averaged subtidal circulation and alongshore momentum balances in the surf and inner shelf region around a cuspate foreland. Data were collected on both sides of the cape representing shorefaces with contrasting shoreline orientation (north-south vs. northwest-southeast) subjected to the same wind forcing. In the nearshore, the subtidal flow is aligned with the local coastline orientation while at the cape point the flow is along the existing submerged shoal, suggesting that cape associated shoals may act as an extension of the coastline. Alongshore momentum balance analysis incorporating wave-current interaction by including vortex and Stokes-Coriolis forces reveals that in deep waters surface and bottom stress are almost in balance. In shallower waters, the balance is complex as nonlinear advection and vortex force become important. Furthermore, linearized momentum balance analysis suggests that the vortex force can be of the same order as wind and wave forcing. Farther southwest of Cape Hatteras point, wind and wave forcing alone fail to fully explain subtidal flow variability and it is shown that alongshore pressure gradient as a response to the wind forcing can close the momentum balance. Adjacent tide gauge data suggest that the magnitude of pressure gradient depends on the relative orientation of local coastline to the wind vector, and in a depth-averaged sense the pressure gradient generation due to change in coastline orientation even at km length scale is analogous to the effect of alongshore variable winds on a straight coastline.en_US
dc.description.sponsorshipThe experimental work was funded by the Carolinas Coastal Processes Project, a cooperative study supported by the US Geological Survey. Additional support during data analysis and preparation of this manuscript was provided by the National Science Foundation (award: OCE-1132130).en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/jgrc.20358
dc.subjectVortex forceen_US
dc.subjectAdvective accelerationen_US
dc.subjectDiamond Shoalsen_US
dc.subjectSubtidal flowsen_US
dc.subjectBreaking accelerationen_US
dc.subjectCurved coastlineen_US
dc.titleAlongshore momentum balance analysis on a cuspate forelanden_US
dc.typeArticleen_US
dc.description.embargo2014-04-15en_US
dc.identifier.doi10.1002/jgrc.20358


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