Effect of seawall on the hydrodynamic performance of pile-restrained H-shaped breakwater using multi-domain boundary element method

The study focuses on the wave interactions with a pile-restrained H-shaped breakwater in the presence of different configurations of seawall. The presence of ellipse shaped seawall (ESS), vertical cum ellipse seawall (VES), inclined cum ellipse seawall (IES), stepped cum ellipse seawall (SES) and circular cum parabolic seawall (CPS) are considered to analyse the performance of H-shaped breakwater. The study is performed to examine the variations of the reflection coefficient of seawall and different structural parameters such as flange width, web draft of the H-shaped breakwater and relative distance between the structure and the seawall using multi-domain boundary element method (MDBEM). The hydrodynamic parameters such as wave the reflection coefficient, wave run-up on the seawall and wave force on the breakwater and seawall are evaluated considering the boundary and edge conditions for fluid-structure interfaces, rigid horizontal seabed, free water surface region, input boundary region, and partially reflecting seawall. The validation of the numerical approach using MDBEM approach is performed with the results available in the literature. In addition, the convergence of the boundary elements is also conducted for the accuracy of the numerical results. The analysis of the hydrodynamic effects of different seawalls interacting with breakwaters offers important insights into coastal engineering. The study also focuses on the effect of wave energy reflection, wave dynamics and overall stability of coastal defensive systems for different configurations and designs of the seawall.