Numerical Simulation of 2DH Wave Propagation Over Submerged Permeable Breakwaters with Steep Slopes

Constantine Memos, Anastasios Metallinos

Monday 29 june 2015

16:30 - 16:45h at North America (level 0)

Themes: (T) Water engineering, (ST) River and coastal engineering

Parallel session: 3I. Engineering - Industrial

The applicability of a 2DH Boussinesq-type wave model in simulating wave propagation over submerged breakwaters with steep slopes was investigated. The original fully dispersive and highly nonlinear model of Chondros and Memos (2014), able to simulate wave propagation over impermeable bottom profile practically in any water depth was extended to cover 2DH wave propagation over permeable structures with steep slopes. This extension was attained by coupling the main solver with a nonlinear Darcy-Forchheimer resistance equation. Computed results were compared against experimental surface elevation measurements including regular cases and Jonswap 3D spectra. Data were taken from experiments in a wave basin of Aalborg University, Denmark, provided by Zanuttigh and Lamberti (2003) as part of the European Research project DELOS. The layout, considered in this paper, was composed by two collinear detached porous breakwaters forming a gap between them. The modified model was able to accurately capture the nonlinear phenomena due to wave propagation over submerged porous structures, including the higher harmonics that appear in the downslope of the inclined breakwaters. The numerical simulations when compared with measurements showed very good agreement in most cases.