EXPERIMENTAL STUDY ON PERFORMANCE OF A NEW SIMPLIFIED WAVE-OVERTOPPING PREVENTION METHOD AND TENSION ACTING ON MOORING ROPES

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  • 簡易越波対策工の越波低減効果と作用張力に関する実験的研究

Abstract

<p> Nakatani et al.(2019) proposed a simple method for the wave-overtopping prevention. The method utilizes a cylindrical body 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, e.g., low cost, ease of construction and maintenance, and so on.</p><p> In this study, hydraulic model experiments were conducted using a two-dimensional wave flume in order to investigate the performance of the new wave-overtopping prevention method, i.e., the reduction of wave-overtopping quantity. Furthermore, the tension acting on the mooring ropes, which is very important factor for the design of the prevention method, was investigated. From the experimental results, it was confirmed that the wave-overtopping prevention method for the vertical seawalls is efficiently able to reduce the wave-overtopping quantity. Both the maximum tension and the average one acting on mooring ropes linearly increase with the significant wave height. The increase rate, however, is markedly different. While the increase rate of the average tension is very small, the maximum tension drastically increases as the significant wave height increases. When the wave height is small, the probability density distribution of the tension can be expressed by the normal distribution. As the wave height increases, however, the shape of the PDF is distorted like a heavy-tailed distribution. In other words, the occurrence probability of strong tension greatly increases.</p>

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