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Nearshore flow dynamics over shore-oblique bathymetric features during storm wave conditions
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  • Laura Szczyrba,
  • Ryan Mulligan,
  • Peir Kenneth Pufahl,
  • Josh L Humberston,
  • Jesse McNinch
Laura Szczyrba
Queen's University

Corresponding Author:[email protected]

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Ryan Mulligan
Queen's University Kingston
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Peir Kenneth Pufahl
Queen's University
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Josh L Humberston
Sandia National Laboratories
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Jesse McNinch
Coastal and Hydraulics Laboratory, US Army Engineer Research and Development Center
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Shore-oblique bathymetric features occur around the world and have been statistically correlated with enhanced shoreline retreat on sandy beaches. However, the physical mechanisms that explain a causal relationship are not well understood. In this study, radar remote sensing observations and results from a phase-resolved numerical model explore how complex morphology alters nearshore hydrodynamics. Observations at selected times during high-energy storm events as well as a suite of idealized simulations indicate that shore-oblique features induce strong spatial variations in the water surface elevation and wave breaking patterns. Re-emergent offshore flows and longshore current accelerations occur near the apex of the oblique nearshore features. The results suggest that complex bathymetric morphology exerts a powerful control on nearshore hydrodynamics and increases the potential for enhanced cross-shore and alongshore sediment transport, thus contributing to localized erosional zones.
14 Nov 2023Submitted to ESS Open Archive
14 Nov 2023Published in ESS Open Archive