Oblique waves interaction with an array of perforated co-centric arc-shaped vertical barriers with a narrow gap

Abstract

The purpose of this paper is to investigate the interaction between oblique waves and a circular array of perforated co-centric vertical barriers mounted at the bottom. In particular, the hydrodynamic performance of barriers is examined as a function of the width of narrow gaps. The investigation was conducted using a semi-analytical approach based on the Boundary Element Method (BEM) by taking into account linear regular waves and potential flow theory. In the solution approach, the BEM-related near singular integrals were calculated indirectly by using the mathematical relationship between Bessel functions. The model was validated by comparing the results with those obtained in previous studies. The effect of geometric parameters, permeability, gap dimension, and wavenumber on wave force and wave strength downstream has been studied. In order to demonstrate the practical application of the developed model, it was implemented on a circular arc-shaped permeable barrier with a narrow gap and a circular offshore tidal lagoon equipped with a netting entrance gate suitable for marine fish farming. It was found that barrier performance was significantly reduced in the presence of a narrow gap. The results of this research provide insight into the interaction between waves and circular permeable barriers.