Abstract
We investigated the mechanism of the entrainment of sediment into a small harbor with channel-type breakwater through experiments in a wave basin. It was found that the significant sediment entrainment took place when the mode of oscillation in the harbor became the 1st mode. In the case where the incident wave period was shorter than the period that caused higher mode oscillation in harbor, only a little amount of sediment entrainment took place. The separated eddies from the top of sub breakwater played very important roll in the entrainment of sediment into the harbor. It is also found that the small jetty attached at the top of sub breakwater could effectively prevent the entrainment of sediment into the harbor. The opening of the channel in breakwater could also reduce the amount of entrainment of sediment at certain condition of incident wave period.
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