Abstract
These days, pollution in a stagnant water area of a semi-enclosed bay is recognized as one of serious water environmental problems. In order to activate the tidal exchange, we proposed a new method to create and control a tidal residual current by using artificial bottom roughness with directional resistance property. On the basis of this idea it was attempted to determine the most effective shape of roughness experimentally. As a result of this research, it was made clear that the half cylinder type, half sphere type and other two types could get large differences of drag coefficient between two flow directions.
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