Tidal and Storm Impacts on Hydrodynamics and Sediment Dynamics in an Energetic Ebb Tidal Delta
1
Department of Oceanography & Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
2
Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA
3
Department of Marine Science, Coastal Carolina University, Conway, SC 29528, USA
4
Louisiana Legislative Auditor, Baton Rouge, LA 70802, USA
*
Authors to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(10), 810; https://doi.org/10.3390/jmse8100810
Received: 9 September 2020
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Revised: 7 October 2020
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Accepted: 10 October 2020
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Published: 19 October 2020
(This article belongs to the Special Issue Observational and Numerical Approaches in Coastal Sediment Dynamics and Hydrodynamics)
Bottom-mounted instrumentation was deployed at two sites on a large sandy shoal of an ebb tidal delta offshore of the Port Royal Sound of South Carolina of USA to collect hydrodynamics and sediment dynamics data. One site (“borrow site”) was 2 km offshore in a dredge pit for nearby beach nourishment and the other site (“reference site”) was 10 km offshore. In situ time-series data were collected during two periods after the dredging: 15 March–12 June (spring) and 18 August–18 November (fall) of 2012. Data at the reference site indicated active migrating bedforms from centimeters to decimeters tall, and sediment concentrations were highly associated with semidiurnal and fortnightly tidal cycles. In the fall deployment, waves at the reference site were higher than those at the shallow borrow site. Both Tropical Storm Beryl and Hurricane Sandy formed high waves and strong currents but did not generate the greatest sediment fluxes. The two sites were at different depths and distances offshore, and waves contributed more to sediment mobility at the reference site whereas tidal forcing was the key controlling factor at the borrow site. This study provides valuable datasets for the selection of sites, prediction of pit infilling, and the modeling of storm impact in future beach nourishment and coastal restoration projects.
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Keywords:
hydrodynamics; sediment dynamics; Port Royal Sound; ebb tidal delta; beach nourishment; bottom boundary layer
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MDPI and ACS Style
Xu, K.; Wren, P.A.; Ma, Y. Tidal and Storm Impacts on Hydrodynamics and Sediment Dynamics in an Energetic Ebb Tidal Delta. J. Mar. Sci. Eng. 2020, 8, 810. https://doi.org/10.3390/jmse8100810
AMA Style
Xu K, Wren PA, Ma Y. Tidal and Storm Impacts on Hydrodynamics and Sediment Dynamics in an Energetic Ebb Tidal Delta. Journal of Marine Science and Engineering. 2020; 8(10):810. https://doi.org/10.3390/jmse8100810
Chicago/Turabian StyleXu, Kehui, P. Ansley Wren, and Yanxia Ma. 2020. "Tidal and Storm Impacts on Hydrodynamics and Sediment Dynamics in an Energetic Ebb Tidal Delta" Journal of Marine Science and Engineering 8, no. 10: 810. https://doi.org/10.3390/jmse8100810
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