Abstract
Combined wave and surge overtopping caused earthen levee damage on the levee crest and land-side slope during Hurricane Katrina. The high turbulence of the overtopping flow may cause severe soil erosion during combined overtopping. High-performance turf reinforcement mat (HPTRM) is one of the most advanced flexible armoring technologies available today for severe erosion challenges. This study was to study turbulence and erosion characteristics of earthen levee strengthened by HPTRM system in the levee crest and land-side slope. A three-dimensional hydrodynamic and sediment transport model, ECOMSED, has been calibrated and verified with overflow discharge and full-scale overtopping experimental results. The full-scale laboratory study on combined wave and surge overtopping of a levee strengthened with HPTRM was conducted in a two-dimensional laboratory wave/flow flume. This paper describes the calibrated 3D model in the study of overtopping hydrodynamic flow, turbulent shear stress, turbulent kinetic energy, and erosion rate at the toe of land-side slope under combined overtopping condition. New equations for estimating turbulent shear stress, turbulent kinetic energy, and erosion rate at the toe of land-side slope were developed.
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