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Abstract
The practice of placing sediment dredged from navigation channels in the downdrift nearshore is common in the US. These nearshore placements of dredged sediment, or nearshore nourishments, often correspond to a variety of positive nearshore morphology and shoreline stability benefits. They are often able to beneficially use sediment not directly suitable for dry beach placement, which increases the volume available to nourish the full beach profile and keeps sediment in the system that would otherwise be removed. Concentrating dredged sediment placement in nearshore berms may dissipate wave energy farther offshore and reduce the sediment needs of the co-located shoreline. This strategy may be able to extend subaerial beach nourishment lifespan, which typically cost substantially more. Co-located nearshore and subaerial beach nourishments could lead to large cost savings, but the potential to increase subaerial beach fill lifespan has not previously been quantified.References
Johnson, Kobayashi, Gravens (2012): Cross-shore numerical model CSHORE for waves, currents, sediment transport and beach profile evolution. Army Research and Development Center, Coastal and Hydraulics Laboratory Technical Report 12-22.
Melby, Massey, Diop, Das, Nadal-Caraballo, Gonzalez, Bryant, Tritinger, Provost, Owensby, and Stehno (2021): Coastal Texas Protection and Restoration Feasability Study: Coastal Texas flood risk assessment: hydrodynamic response and beach morphology. US Army Research and Development Center, Coastal and Hydraulics Laboratory Technical Report 21-11.
van Duin, Wiersma, Walstra, Van Rijn, and Stive (2004): Nourishing the shoreface: observations and hindcasting of the Egmond case, The Netherlands. Coastal Engineering, 51(8-9), pp.813-837.
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Copyright (c) 2023 Douglas Krafft, Jeffrey Melby, Brian McFall, Bradley Johnson