A wall-less waveguide solution for enhanced propagation of shallow water wave

The efficient transmission of shallow water waves over long distances poses a significant challenge due to the inherent spreading loss experienced during propagation. Conventional methods, including reflection-based waveguides, are limited by modal dispersion, restricting their operational bandwidth. We are introducing a novel approach to overcome these limitations through the utilization of a broadband wall-less waveguide engineered for shallow water waves. Inspired by graded-index optical fibers, the proposed waveguide utilizes a visco-elastic sea-bed carpet to achieve a tunable effective gravitational acceleration. This mechanism enables the control of wave propagation without physical boundaries, allowing the focused transmission of water waves over long distances with significantly reduced attenuation of wave energy. Numerical simulations reveal that water waves disperse in the transverse direction due to flat bottom topography, resulting in a large drop in wave amplitude. The waveguide, on the other hand, demonstrates better wave confinement with notably less reduction in wave amplitude. These findings present a promising solution for applications in various fields, including the design of artificial surf zones, wave energy farms, and coastal protection mechanisms.