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dc.contributor.authorElgar, Steve  Concept link
dc.contributor.authorRaubenheimer, Britt  Concept link
dc.date.accessioned2011-03-22T16:08:04Z
dc.date.available2011-03-22T16:08:04Z
dc.date.issued2010-06
dc.identifier.urihttps://hdl.handle.net/1912/4408
dc.descriptionAuthor Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Continental Shelf Research 31 (2011): 9-14, doi:10.1016/j.csr.2010.10.007.en_US
dc.description.abstractNear-bottom currents observed on a tidal flat are compared with those observed 50 m away inside a shallow (0.25 to 0.40 m deep) channel. For water depths between 0.5 and 2.5 m (when both current meters are submerged), current speeds 0.13 m above the bed on the flat are about 30% greater than those observed 0.13 m above the bed in the channel, and are approximately equal to those observed 0.58 m above the channel bed (0.26 m above the flat elevation). Flow directions on the flat are similar to those in the channel. For flows parallel to the channel axis, the ratio of speeds 0.13 m above the bed on the flat to those 0.13 m above the bed in the channel decreases from about 1.4 to about 1.1 with increasing water depth, consistent with conservation of mass. For flows directed across the channel axis, the ratio of speeds increases from about 1.3 to about 2.2 with increasing water depth. The corresponding ratio of the vertical velocity variances (a proxy for turbulence) decreases from about 1.5 to about 0.2, suggesting that the turbulence near the bed of the channel is greater than that near the bed of the flat for water depths greater than about 1.0 m. In contrast, for along-channel flows, the channel and flat turbulence levels are similar. Drag coefficients estimated with the vertical velocity variance or with a cross-shore momentum balance are approximately 70% larger in the channel than over the visually smoother flat.en_US
dc.description.sponsorshipThe Office of Naval Research, the National Science Foundation, and a National Security Science and Engineering Faculty Fellowship provided support.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.relation.urihttps://doi.org/10.1016/j.csr.2010.10.007
dc.subjectTidal flaten_US
dc.subjectFlow in channelsen_US
dc.subjectDrag coefficienten_US
dc.titleCurrents in a small tidal-flat channelen_US
dc.title.alternativeCurrents in a small channel on a sandy tidal flaten_US
dc.typePreprinten_US


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