長周期波と港湾の周辺形状との関連について

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Harbors facing to open-sea are sometimes troubled with long-period waves. Long-period waves cause harbor oscillations, and damage moored ships and adjacent structures. So far some studies on harbor oscillations have been carried out, and calculation models have been developed. Previous analytical studies can be divided into two groups. The first is the method that the basic solution of the Helmholtz equation is expressed in terms of an infinite series. The second is expressed in terms of the zero order Hankel function of the first kind alone. Applying the second method, a new calculation model is developed in this paper. This model is applicable to harbors which have arbitary boundary in the open-sea region as well as the harbor region. Some details about the new model are given in the 2nd chapter. In the 3rd chapter, the numerical results are compared with previous study. Then the model is applied to three familiar harbors. The obtained results are summarized as follows; (1)About the integral of coastline parts, the tip of the boundary is set at the point that the radiated wave function attenuats to 1/10. (2)In spite of the difference in the surrounding land form of the harbors, each resonant period resembles, and the wave patterns in the harbor region for the resonant modes is very similar to each other. (3)In the open-sea region, long-period waves have a different influence on the wave pattern according to the surrounding land form of the harbors.
社団法人日本航海学会の論文
1996-09-25

長周期波と港湾の周辺形状との関連について

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