A Study on the Effect of the Breakwater with Multi-openings on Harbor Oscillation

Abstract

In order to improve harbor tranquility, breakwaters are often constructed. Above all, offshore detached breakwaters are set up when the wave direction varies with seasons or the water is deep. Consequently the harbor has multi-openings. In this paper, new calculation models are introduced. These models are applicable to harbors which have some offshore detached breakwaters. Some details about the new models are given in the 2nd chapter. In the 3rd chapter, the numerical results are compared with previous study. Then the models are applied to some harbors. The obtained results are summarized as follows; (1) Using this new models, wave patterns in harbors with multi-openings can be predicted. (2) Mathematically, the existance of offshore detached breakwaters is considered in the models. (3) Offshore detached breakwaters in front of habor entrance are not so effective for the control of harbor oscillation. (4) By constructing an opening at the inner and the end part of the harbor, wave patterns can be changed entirely.