Publication Date:
2022-05-25
Description:
Author Posting. © American Geophysical Union, 2007. 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 112 (2007): C12015, doi:10.1029/2007JC004101.
Description:
A series of process-oriented numerical simulations is carried out in order to evaluate the relative role of locally generated residual flow and overtides on net sediment transport over linear sandbanks. The idealized bathymetry and forcing are similar to those present in the Norfolk Sandbanks, North Sea. The importance of bottom drag parameterization and bank orientation with respect to the ambient flow is examined in terms of residual flow and overtide generation, and subsequent sediment transport implications are discussed. The results show that although the magnitudes of residual flow and overtides are sensitive to bottom roughness parameterization and bank orientation, the magnitude of the generated residual flow is always larger than that of the locally generated overtides. Also, net sediment transport is always dominated by the nonlinear interaction of the residual flow and the semidiurnal tidal currents, although cross-bank sediment transport can occur even in the absence of a cross-shore residual flow. On the other hand, net sediment divergence/convergence increases as the bottom drag decreases and as bank orientation increases. The sediment erosion/deposition is not symmetric about the crest of the bank, suggesting that originally symmetric banks would have the tendency to become asymmetric.
Description:
Funding for this work was provided by the
U.S. Geological Survey as part of the SC Coastal Erosion Study and by the
South Carolina Sea Grant Consortium (grant V169). Additional support for
one of the authors (G. Voulgaris) was provided by the Office of Naval
Research (Southeast Coastal Ocean Observing Systems) and by the
National Science Foundation (award OCE-0451989).
Keywords:
Tidal sandbanks
;
Residual flow
;
Net sediment transport
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
application/pdf
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