Suspended Sand Transport along Pier Depression
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 135, Issue 5
Abstract
Velocities and sand concentrations measured along 20 transects at the Field Research Facility (FRF) at Duck, North Carolina during October 16–23, 1997 are analyzed to examine the cross-shore and longshore suspended sand transport in the FRF pier depression. The suspended sand volume per unit bottom area remains large outside the surf zone in the depression. The depth-integrated offshore and longshore suspended sand transport rates are shown to be estimated as , and , respectively, where the empirical parameter is in the range of 0.1–0.4 in the depression, is the cross-shore current and is the longshore current. The offshore suspended sand transport rate at the end of the pier is estimated to be as large as at the peak of a storm with an offshore significant wave height of 3.5 m. The sand transported offshore appears to have been supplied by the longshore sand transport toward the pier depression.
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Acknowledgments
This study was partially supported by the U.S. Army Corps of Engineers under Grant No. UNSPECIFIEDW912BU-07-C-0013. The first writer was supported initially by the Spanish postdoctoral scholarship MEC/FULBRIGHT and then by the postdoctoral fellowship program of the Centennial Anniversary Foundation of Kumamoto University, Japan. The writers thank Jarrell Smith, Chuck Long, Jane Smith, and Bradley Johnson for providing the field data used in this study.
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© 2009 ASCE.
History
Received: Dec 7, 2007
Accepted: Feb 17, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
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