Wave interactions with double slotted barriers

The present article outlines the numerical calculation of wave interactions with a pair of thin vertical slotted barriers extending from the water sur face to some distance above the seabed, and describes laboratory tests unde rtaken to assess the numerical model. The numerical model is based on an ei genfunction expansion method and utilizes a boundary condition at the surfa ce of each barrier which accounts for energy dissipation within the barrier . Comparisons with experimental measurements of the transmission, reflectio n, and energy dissipation coefficients for partially submerged slotted barr iers show excellent agreement and indicate that the numerical method is abl e to adequately account for the energy dissipation by the barriers. (C) 199 9 Elsevier Science Ltd. All rights reserved.