Barrier Island Erosion During a Winter Cold Front in Mississippi Sound

摘要

The present study uses high-resolution hydrodynamic and sedimentation models to evaluate the sedimentation patterns inferred in the previous study. This work is examining the sensitivity of erosion on the sound side of West Ship Island to the tidal stage and changes in coastline due to beach replenishment. Water levels and mean currents for a range of tidal conditions and typical cold front winds are being computed using POM. Waves within Mississippi Sound are being calculated for a typical cold front using the SWAN (Simulating Waves Nearshore) model. Surf zone waves and Ion shore currents are being commuted using the SHOCIRC hydrodynamic model. The waves and currents calculated by SWAN, POM, and SHORECIRC are being used to drive a three-dimensional sedimentation model, the Littoral Sedimentation and Optics Model (LSOM), which computes wave and current interaction using a modified version of the Grant and Madsen bottom boundary layer model. LSQM calculates bed roughness and suspended sediment concentrations in addition to bed load. The models are being used to simulate waves, currents, an sedimentation during other cold fronts as well.