Wave Averaging for Scoping Level Estimates of Nearshore Berm Morphodynamics
ERDC Coastal and Hydraulics Laboratory Vicksburg United States
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Nearshore berms beneficially use dredged sediment to retain sediment in the littoral system, add material to the beach profile, and potentially dissipate energy from large erosive waves. Scoping level estimates of nearshore berm morphodynamics could provide useful information to assist coastal engineers and planners. Methodologies are presented to use long records of wave hindcast data to determine representative peak and mean wave climate data for scoping level nearshore berm morphodynamic estimates. Representative mean wave climate data are selected from distributions of averages over specified durations. Representative peak wave climate data are selected from distributions of quarter year averages. The relevance of combinations of wave parameters to nearshore berm morphodynamics is addressed with further analysis of a large nearshore berm at Fort Myers Beach, FL. Estimates of nearshore berm morphodynamics were quantified from survey data. The migration direction of the case study nearshore berm was found to be described by the ratio of storm to non-storm wave energy flux time integrals. Evidence suggesting that the net volume of sediment transported in the littoral zone between surveys may be proportional to the time integral of the non-storm wave energy flux is also presented.
- Physical and Dynamic Oceanography
- Civil Engineering