Wave-induced sediment transport and onshore sandbar migration


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dc.contributor.author Hsu, Tian-Jian
dc.contributor.author Elgar, Steve
dc.contributor.author Guza, R. T.
dc.date.accessioned 2006-10-26T12:34:36Z
dc.date.available 2006-10-26T12:34:36Z
dc.date.issued 2006-04-06
dc.identifier.uri http://hdl.handle.net/1912/1280
dc.description Author Posting. © Elsevier B.V., 2006. 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 Coastal Engineering 53 (2006): 817-824, doi:10.1016/j.coastaleng.2006.04.003. en
dc.description.abstract The 25-m onshore migration of a nearshore sandbar observed over a 5-day period near Duck, NC is simulated with a simplified, computationally efficient, wave-resolving singlephase model. The modeled sediment transport is assumed to occur close to the seabed and to be in phase with the bottom stress. Neglected intergranular stresses and fluid-granular interactions, likely important in concentrated flow, are compensated for with an elevated (relative to that appropriate for a clear fluid) model roughness height that gives the best fit to the observed bar migration. Model results suggest that when mean-current-induced transport is small, wave-induced transport leads to the observed onshore bar migration. Based on the results from the simplified phase-resolving model, a wave-averaged, energetics-type model (e.g., only moments of the near-bottom velocity field are required) with different friction factors for oscillatory and mean flows is developed that also predicts the observed bar migration. Although the assumptions underlying the models differ, the similarity of model results precludes determination of the dominant mechanisms of sediment transport during onshore bar migration. en
dc.description.sponsorship Supported by the Office of Naval Research, the National Science Foundation, the Army Research Office, and the Woods Hole Oceanographic Institution Coastal Ocean Institute. en
dc.format.extent 725071 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.relation.uri http://dx.doi.org/10.1016/j.coastaleng.2006.04.003
dc.subject Sediment transport en
dc.subject Sandbar migration en
dc.subject Wave boundary layer en
dc.subject Roughness en
dc.subject Bottom stress en
dc.title Wave-induced sediment transport and onshore sandbar migration en
dc.type Preprint en

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