Water Waves from Underwater Explosions in Shallow Water, Part II: Characteristics of Waves Near the Shoreline and Method of Estimating Wave Forces on a Vertical Barrier

摘要

The characteristics of dispersive water waves--wave celerity, water particle velocity, and wave deformation--were studied in the laboratory in a region adjacent to the shoreline on a beach which has a 1:14 slope. The waves were generated by immersing a plunger at a distance from the shoreline in water of constant depth. A numerical scheme for the calculation of mean water particle velocity in the horizontal direction was developed according to the principle of continuity. This scheme is highly stable and is suitable for small computer facilities such as the IBM 1620. Methods for the estimation of wave forces and pressures on a vertical barrier, mounted as a seawall, were developed. The methods are based on momentum consideration and require knowledge of the water particle velocity in the horizontal direction and the shape of the incident wave. (Author)