On basic conditions for long-wave simulations in harbors by the Boussinesq model

Kazuyuki Ota, Akinori Yoshida, Masaru Yamashiro, Yasuhiro Nishii

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish
JournalProceedings of the Coastal Engineering Conference
Publication statusPublished - Dec 1 2010
Event32nd International Conference on Coastal Engineering, ICCE 2010 - Shanghai, China
Duration: Jun 30 2010Jul 5 2010

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Ocean Engineering
  • Oceanography


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