Abstract

The roles of forest along the river bank have been noted from the view point of the river environment and flood disaster. Bed load transport and sediment deposition are experimentally examined in an open channel with cylinders installed across the whole channel width in their multiple rows. Cylinders were placed in stagger with their equal spacing on the bed.The transport rate of bed load was measured on the movable bed. The bed-load transport rate was found less than that in an open channel without cylinders. Effcetive friction velocity was found from the comparison of the measurement of bed-load transport rate with a transport rate equation. The transport rate of bed load and the non-dimensional average velocity decrease with the arrangement density of cylinders.Sediment deposition profiles were also measured. In the case of larger density of cylinder arrangement, sediment deposition occurs in the upper stream reach, while, in the case of smaller density, sediment deposition occurs in the downstream reach. The comparison of the calculation and the experiments shows good agreement.

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