Inverse Estimation of Sand Transport Rates on Nourished Delaware Beaches
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134, Issue 4
Abstract
The Delaware Atlantic coast of length is suffering from beach erosion. The State of Delaware placed approximately sand on its four beaches in 1998. Beach profiles were surveyed along fixed 65 cross-shore lines almost semiannually for 9–11 times until 2005. The measured profiles are analyzed to obtain the shoreline displacement and the area changes in the landward and shoreward zones between the two successive profile surveys. The relations among these profile change parameters indicate that a standard one-line model may not be applicable to these nourished beaches because of the dominant summer and winter profile changes. An inverse method based on a two-line model is developed to estimate the cross-shore sediment transport rate and the gradient of the longshore sediment transport rate. The estimated rates indicate the importance of both cross-shore and longshore sediment transport to predict the evolution of these nourished beaches with large variabilities in time and space.
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Acknowledgments
The writers would like to thank the Delaware Department of Natural Resources and Environmental Control (DNREC) for providing the beach nourishment and survey data used in this study. This study was supported partly by the National Oceanic and Atmospheric Administration (NOAA), Office of Sea Grant, Department of Commerce, under Grant No. UNSPECIFIEDNA85AA-D-SG033 (Project R/ETE-4) and partly by the U.S. Army Engineer Research and Development Center in conjunction with the MORPHOS project.
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134 • Issue 4 • July 2008
Pages: 218 - 225
Copyright
© 2008 ASCE.
History
Received: Feb 15, 2007
Accepted: Sep 4, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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