Abstract
Some flood-control dams have a gateless bottom outlet at a riverbed elevation. A management of this kind of dams is easy, because gate operation is unnecessary and there is almost no environmental problems caused by impounding such as a reservoir sedimentation and water quality changes. The river-bed bottom outlet must be designed to pass a large quantity of driftwood safely during flood events. A three-dimensional free-surface flow is predominant in the neighborhood of a mouth of the outlet. Therefore, the particle method, which can handle a complicated water-surface change explicitly, is effective. In this study, three-dimensional model of floating bodies are proposed to be introduced into the three-dimensional MPS method. A simulation of a blocking phenomena by driftwood at the bottom outlet is carried out.
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