Wave-induced sediment transport and onshore sandbar migration
MetadataShow full item record
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.
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.
Suggested CitationPreprint: Hsu, Tian-Jian, Elgar, Steve, Guza, R. T., "Wave-induced sediment transport and onshore sandbar migration", 2006-04-06, https://doi.org/10.1016/j.coastaleng.2006.04.003, https://hdl.handle.net/1912/1280
Showing items related by title, author, creator and subject.
Nienhuis, Jaap H.; Ashton, Andrew D.; Nardin, William; Fagherazzi, Sergio; Giosan, Liviu (John Wiley & Sons, 2016-04-21)River mouths, shoreline locations where fluvial and coastal sediments are partitioned via erosion, trapping, and redistribution, are responsible for the ultimate sedimentary architecture of deltas and, because of their ...
Sedimentation study, Environmental Monitoring and Operations Guidance System (EMOGS), Kings Bay, Georgia and Florida, 1988-1990 : final report Aubrey, David G.; McSherry, T. R.; Spencer, Wayne D. (Woods Hole Oceanographic Institution, 1991-07)Repeated side-scan sonar and multi-frequency bathymetric surveys, accompanied by accurate, high resolution, and repeatable navigation, were conducted in the vicinity of a tidal inlet to define the length and time scales ...
Salimi‐Tarazouj, Ali; Hsu, Tian-Jian; Traykovski, Peter A.; Cheng, Zhen; Chauchat, Julien (American Geophysical Union, 2020-12-29)A new modeling methodology for ripple dynamics driven by oscillatory flows using a Eulerian two‐phase flow approach is presented in order to bridge the research gap between near‐bed sediment transport via ripple migration ...