BASIC STUDY ON A NEW WAVE-OVERTOPPING PREVENTION METHOD

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  • 新たな越波対策工の提案とその効果に関する基礎的研究

Abstract

<p> In this study, a simple method for the wave-overtopping prevention was proposed. The method utilizes a cylindrical body (assumed length of 5-10m) for the vertical seawalls, the both ends of the cylindrical body are moored using rope to the front face of the seawalls. The mooring allows that the cylindrical body moves following the wave motion in front of the seawall. This method has several merits, for example, low cost, ease of construction and maintenance, and so on. First, model experiments were conducted to confirm the performance of the method. Next, numerical simulations were performed to estimate the reduction of wave-overtopping rate by this method. The numerical model was "DualSPHysics" which is based on the Smoothed Particle Hydrodynamics (SPH) model. The cylindrical body, however, was fixed at several different positions in the simulations because the numerical model cannot simulate the motion of mooring objects. From the experimental results and the numerical simulations, it was confirmed that the proposed method can efficiently reduce the wave-overtopping quantity, and the SPH model can be a useful tool to investigate the performance of the proposed method in detail.</p>

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