Idealized Marsh Simulations: Sensitivity of Hurricane Surge Elevation and Wave Height to Seabed Elevation
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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The purpose of this CHETN is to examine changes in peak surge elevation and wave height associated with changes in the elevation of an idealized coastal feature. Landscape features with vegetation have the potential to reduce storm surge elevations and dissipate wave energy. Land elevations greater than the storm surge elevation act as a physical barrier and create bathymetric resistance for the surge and waves. Landscape features such as marshes also have the potential to create frictional resistance and affect storm surge and wave energy even when below the surge elevation. This is the second in a series of technical notes on the influence of marshes on storm surge and waves. The analysis in this note isolates the sensitivity of the modeled storm surge and waves to topographic and bathymetric change. Elevation is varied in the model simulations to represent the effects of seabed lowering loss of marsh due to erosion, subsidence, or sea level rise and indicates, in a qualitative sense, the degree to which a raised or lowered low-profile coastal feature may reduce storm surge elevation.
- Hydrology, Limnology and Potamology