ON BASIC CONDITIONS FOR LONG-WAVE SIMULATIONS IN HARBORS BY THE BOUSSINESQ MODEL

Proceedings of the International Conference on Coastal Engineering

Masaru Yamashiro²  Akinori Yoshida²  Kazuyuki Ota¹  Yasuhiro Nishii³ 

[1] Central Research Institute of Electric Power Industry;Kyushu University;Sanyo Consultants Co., Ltd.

关键词: long-period ship motions;    long waves;    Boussinesq model;    harbor oscillations;   

DOI  :  10.9753/icce.v32.currents.40

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

For wave field calculations to estimate long-period ship motions in harbors, the so-called Boussinesq model seems to be widely used because of its versatility. However, it has not yet been clarified how large the sponge layer should be to simulate an open-sea condition, how long the computation should be continued to obtain a statistically stable spectrum, and what size of computational area should be considered. In this study, these basic conditions were investigated by conducting wave field simulations using the Boussinesq model. Useful information was obtained such as: (1) the thickness of the sponge layer can be much less than the thickness expected from one-dimensional calculations, (2) the data length to obtain a stable spectrum needs to be much longer than statistically expected 3 to 5 hours, and this is because the beat waves are produced by selectively amplified component waves near resonant frequencies in harbors.(3) the size of the computational area does not affect the results greatly and the distance 3 km between the end of the breakwater and the lateral sponge boundary is practically sufficient for the harbor mouth opening.

【 授权许可】

Unknown