2006年8月洪水における音更川河道変遷

抄録

Typhoon No. 10, which struck Hokkaido Prefecture in August 2006, caused flood on the Otofuke River, which is in the part of the Tokachi district. At this event the trees colony which is in this river was mostly collapsed, and the situation was altered before or after a flood. In this research, the flow velocity into trees during the collapse of tree colony was observed by ADCP.

As the result the flow distribution was changed from uniform against the perpendicular direction to the parabola as time passes. This changing means that the prevention was reduced by the tree collapse on the flood. And in this paper it considered about cause of tree colony collapse, as one of that factor, it was mentioned the flood time on the tree colony and so on.