Beach Nourishment Linked to Increased Human-Shark Encounters

Sediment movement from coastal restoration projects may impact shark visibility, raising safety concerns.

Apr. 11, 2026 at 11:35am

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An abstract painting featuring sweeping geometric arcs, concentric circles, and precise botanical spirals in earthy tones of green, blue, and brown, conceptually representing the complex interplay between coastal sediment movement, underwater visibility, and shark behavior.Coastal engineering projects may inadvertently impact the underwater visibility that sharks rely on, potentially leading to more accidental encounters with beachgoers.Palm Beach Gardens Today

A new study has found that beach nourishment projects, which involve adding sand to eroded coastlines, may be contributing to an increase in human-shark interactions in certain Florida coastal areas. The movement of sediment during these restoration efforts can create murky water conditions that reduce visibility for sharks, potentially leading to more accidental encounters with beachgoers.

Why it matters

As coastal communities continue to grapple with the effects of erosion and sea level rise, beach nourishment has become a common strategy to protect shorelines. However, this research suggests that these projects may have unintended consequences for public safety by altering the underwater environment in ways that make sharks more difficult for swimmers and surfers to detect.

The details

The study, conducted by researchers at the University of Miami's Rosenstiel School of Marine and Atmospheric Science, analyzed data on shark attacks and beach nourishment projects along Florida's east coast over a 20-year period. They found a statistically significant correlation between beach restoration efforts and a rise in reported human-shark interactions, particularly in the months immediately following nourishment activities.

  • The study examined data from 2000 to 2020.
  • Beach nourishment projects often take place during the summer months when beach usage is highest.

The players

University of Miami Rosenstiel School of Marine and Atmospheric Science

A leading oceanographic research institution that conducts studies on coastal and marine environments.

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What they’re saying

“Beach nourishment can have unintended consequences for public safety by creating conditions that make it harder for swimmers and surfers to spot sharks in the water.”

— Dr. Neil Hammerschlag, Research Associate Professor and Director of the Shark Research and Conservation Program at the University of Miami Rosenstiel School

What’s next

Researchers plan to continue monitoring human-shark interactions and work with coastal managers to develop strategies that balance beach restoration needs with public safety concerns.

The takeaway

This study highlights the importance of considering the potential ecological impacts of beach nourishment projects, which are becoming increasingly common as communities adapt to climate change-driven coastal erosion. Careful planning and mitigation measures may be necessary to reduce the risk of human-shark encounters in areas where these restoration efforts are undertaken.