Abstract
In order to settle the water pollution problems in a harbor, various resolutions, such as a permeable breakwater and a seawater exchange breakwater, have been proposed and developed. In this study, usage of a permeableb reakwater as a resolution of the water pollution problem is examined. A double-walled breakwater is used as a permeable breakwater, which is consisted of an inclined plate array as a front wall and a curtain wall with some spacing near the seabed as a rear wall. We have already presented the wave transmission and reflection characteristics about the double-walled breakwater.In order to clarify the water exchangea bility about the double-walled breakwater, the 3-D experiment about a model harbor is carried out. The mass flux by wave actions through the harbor entrance and the spacing beneath the double-walled breakwater is examinede xtensively. We also observe the mean flow pattern around the permeable breakwater for various wave conditions.
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