Browsing by Author "Karaseeri, A.G."

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    Oblique wave propagation through composite permeable porous structures
    (Springer Science and Business Media Deutschland GmbH, 2023) Krishna, K.R.A.; Karaseeri, A.G.; Karmakar, D.
    In the present study, the porous breakwater system consisting of a porous block and a permeable barrier is analysed to understand the wave dissipation due to the composite porous structure. The linearised wave theory is adopted to analyse the wave interaction with three different configurations of the composite structures including (a) porous structure and fully extended vertical barrier, (b) porous structure and bottom-standing barrier and (c) porous structure and surface-piercing barrier. The eigenfunction expansion method along with orthogonal mode-coupling relation is adopted to determine the wave reflection and transmission characteristics along with wave force on the porous structure and barrier, and surface deflection in incident and transmitted region. The experimental investigation is performed for the composite breakwater system and the results obtained are compared and validated with the numerical results. The composite breakwater system is studied for various parameters such as relative water depth, porosity of structure and barrier, structural thickness to wavelength ratio, water depth to wavelength ratio and gap between the structure and barrier. Further, the comparative study is performed with the results available in the literatures. The proposed study exhibits an informative result for the wave energy attenuation by the composite breakwater system which can be designed and implemented in coastal and harbour regions for achieving the tranquillity. © 2022, The Author(s), under exclusive licence to Sociedade Brasileira de Engenharia Naval.
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    Wave transformation due to stratified porous structure and vertical barrier
    (American Institute of Physics Inc., 2023) Karaseeri, A.G.; Krishna, K.R.A.; Karmakar, D.
    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).