Marsh Erosion Processes near a Coastal Highway on the Outer Banks, NC
Publication: Geo-Extreme 2021
ABSTRACT
The northern sound-side shoreline of Pea Island, which is adjacent to Oregon Inlet on the Outer Banks, NC, is steadily eroding, increasing the proximity of the NC 12 highway to the Pamlico Sound. Field observations of bathymetry, sediment grain size, vegetation, and water levels, along with pre- and poststorm shoreline surveys were used to examine the spatial variability in hydrodynamics, morphodynamics, and vegetation in the region. Local hydrodynamics are driven by a complex interaction of ocean- and sound-side processes. Erosion is likely driven by inlet-driven processes and major storms causing overland flow. Spatial heterogeneity in erosion may be owing to differences in bathymetry, topography, sediment sizes, and vegetation. The field data are being used to calibrate a numerical model and develop planning level tools to improve the understanding of flooding and erosion and to enhance the sound-side resilience of a coastal transportation corridor.
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Geo-Extreme 2021
Pages: 329 - 338
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© 2021 American Society of Civil Engineers.
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Published online: Nov 4, 2021
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