SURVEY OF VERTICAL FORMATION OF FLOW VELOCITY WITH RIPARIAN WOODS ON 2005-FLOOD IN BIBAI RIVER

Riparian wood area is assumed to be dead water section on study for flowing ability. But, calculation results of water level might not correspond with observations on medium-small scale rivers. We surveyed about vertical formation of flood flow velocity on the cross section including riparian wood area in Bibai River on August 22, 2005. As a result, about 27% of total flow quantity flowed down through the riparian woods on this survey section. And, formation of flow velocity on woods area almost agrees with the theoretical value. But, formation of flow velocity outside the woods is lower than the theoretical one.