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Apr 26, 2012
A Circulation Modeling Approach for Evaluating the Conditions for Shoreline Instabilities
Authors: Jeffrey H. List [email protected] and Andrew D. Ashton [email protected]Author Affiliations
Publication: Coastal Sediments '07
Abstract
Analytical models predict the growth (instability) of shoreline salients when deep-water waves approach the coast from highly oblique angles, contrary to classical shoreline change models in which shoreline salients can only dissipate. Using the process-based wave, circulation, and sediment transport model Delft3D, we test this prediction for simulated bathymetric and wave characteristics approximating the open-ocean conditions at Duck, North Carolina. We consider two cases: a uniform coast with a varying wave approach angle, and a bathymetry with coastal salients and a single high-angle boundary wave condition. Incident wave conditions include a swell case with no wind and a wind-wave case with active local wave regeneration by wind. The uniform-coast tests predict transport maxima at oblique wave angles for both wave cases, indicating the potential for shoreline instabilities, similar to the analytical models. However, the critical angle for instability is much higher in the wind-wave case. Our tests with coastal salients agree with previous findings that a minimum salient length scale may be required for the instability effect to be active. Here, a salient with a longshore scale of 4 km results in transport divergence (erosion; no instability) at the salient crest while an 8 km salient results in transport convergence (accretion; instability) at the crest.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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U. S. Geological Survey, 384 Woods Hole Rd., Woods Hole, MA, 02543. E-mail: [email protected]
U. S. Geological Survey, 384 Woods Hole Rd., Woods Hole, MA, 02543 and Woods Hole Oceanographic Institution., MS #22, 360 Woods Hole Rd., Woods Hole, MA 02543. E-mail: [email protected]
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