Abstract
Nearshore nourishments are constructed for shoreline protection from waves, to provide sediment nourishment to the beach profile, and to beneficially use dredged sediment from navigation channel maintenance. However, it is poorly understood how placement morphology and depth influence nearshore processes operated on wave-dominated coasts. This study investigates the wave fields, sediment transport, and morphological response to three common nearshore nourishment shapes, nearshore berm (elongated bar), undulated nearshore berm, and small discrete mounds, with numerical experiments utilizing the Coastal Modeling System. The nourishments are placed in depths between 3 m and 7 m with a volume of approximately 100,000 m3 and between 400 m and 1000 m in alongshore length. Numerical experiments are carried out in three distinct coastal settings with representative wave climates and geomorphology. Simulation results indicate that shallower, more continuous berms attenuate the most wave energy, while deeper, more diffuse placements retain more sediment. Results from this study improve the understanding of nearshore nourishment shapes and can support decision makers identifying the most appropriate construction technique for future nearshore nourishment projects.
Highlights
Sandy beaches are a natural or nature-based feature (NNBF) that serve a crucial societal, cultural, economic, and environmental role [1] but typically require periodic maintenance through sand nourishment
Nearshore nourishment projects are commonly completed around the globe
In the United States (U.S.), the U.S Army Corps of Engineers currently place more than 7.7 million m3 in the nearshore annually [2]
Summary
Sandy beaches are a natural or nature-based feature (NNBF) that serve a crucial societal, cultural, economic, and environmental role [1] but typically require periodic maintenance through sand nourishment. Nourishment projects can be on the subaerial beach or in the nearshore. Nearshore nourishment projects are commonly completed around the globe. In the United States (U.S.), the U.S Army Corps of Engineers currently place more than 7.7 million m3 in the nearshore annually [2]. 1.5 m to 26 m, nourishment volumes between 18,000 m3 to 14,300,000 m3 , and heights of. Projects that place sediment in the nearshore have many names, including nearshore nourishment, profile nourishment, nearshore placement, littoral placement, or shoreface nourishment. When the sediment is intentionally placed as an artificial sandbar or mound, it is called a nearshore berm. Regardless of the name, the projects nourish the beach profile by placing sediment in the nearshore zone
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
