橋脚周辺における流木の挙動監視調査

抄録

It is very important to recognize the behavior of driftwoods for taking measure to prevent destruction of river structure and overflowing bridge area. Because of heavy rains or flowing in melting water of snow in spring season, soft ground slope of mountain or shore of river or sandbanks are collapsed or scraped off. Then the Trees in these area flow into the river and become driftwood. We tried to know the behavior of driftwood around the pier under flood condition using remote-controlled surveillance camera at Kouseihashi-bridge in Shimukappu village in Hokkaido. In this observation at high water level flow we get many pictures of colliding driftwood with pier and behavior of flowing driftwood in the river.