Wave transformation due to stratified porous structure and vertical barrier

Abstract

The present study examines hydrodynamic performance of the horizontally stratified porous structure along with fully extended vertical barrier. The combination of the submerged porous structure with barrier consists of a fully extended barrier and a fully extended stratified porous structure. The small amplitude water wave theory is adopted for the study of the wave transmission through the composite breakwater system. The Darcy's law is followed for the flow through porous media. The eigenfunction expansion method along with the mode-coupling relation is adopted to determine the hydraulic characteristics. The hydrodynamic characteristics is obtained for different geometric conditions of structure and wave parameters. The study is performed to investigate the energy dissipation in the confined regions. The porosity of the structure is varied in the numerical calculations and the optimum porosity for the structure is selected for the efficient performance of the structure. Further, the experimental study is performed to validate the numerical result and to analyse wave transmission through the combined breakwater system. To maintain the tranquil condition and to protect coastline from the severe wave attack the combination of the vertical barrier and stratified porous structure can be an effective and economical solution. The wave force over the structure is reduced by the fully extended vertical barrier, which acts as a primary structure to reduce the direct impact over the stratified structure by absorbing some part of the wave energy and also improving the durability of the structure. © 2023 Author(s).