Equilibrium Beach Profile with Net Cross-Shore Sand Transport
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144, Issue 6
Abstract
Periodic beach-fill placement and frequent overwash result in net offshore and onshore sand transport, respectively. Three tests consisting of fifty 400-s runs were conducted in a small-scale wave flume to examine the effect of net cross-shore sand transport on an equilibrium profile. The foreshore of an equilibrium profile with no net sand transport shifted seaward after periodic sand placement near the shoreline. Frequent sand overwash resulted in the landward shift of the shoreline. The profile changes for the three tests were relatively small and the shoreline shifts were less than 0.1 m. An analytical model for an equilibrium profile with net cross-shore sand transport was developed by approximating existing formulas for onshore bed load and offshore suspended sand transport in the inner surf zone. The model predicted the horizontal shift of the equilibrium profile under net cross-shore sand transport, which was the maximum at the shoreline and approached zero at the closure depth. The model calibrated using the three tests was used to estimate the seaward shift of the shoreline on periodically nourished beaches on a prototype scale.
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Acknowledgments
This study was partially supported by the Delaware Sea Grant under Grant NOAA SG2016–18 R/RCE-9.
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144 • Issue 6 • November 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Oct 26, 2017
Accepted: Apr 18, 2018
Published online: Jul 31, 2018
Published in print: Nov 1, 2018
Discussion open until: Dec 31, 2018
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