EXPERIMENTAL STUDY ON EXFOLIATION PROCESS OF DRIFTWOOD IN DEBRIS FLOW CONSIDARING FLOW TIME

Abstract

 Flowing into river of many driftwoods when it was raining heavily was placed at significant factor on enormous rain disaster mainly because driftwoods were deposited at a bridge and cause overflow then living area was damaged. So a lot of studies on relieveing damage caused by driftwood were carried out. However, study on process of exfoliation of driftwood was not conducted yet. Therefore, in this study, the hydraulic model experiments were carried out using flat rortating channel in order to investigate barking process. Firstly, it was confirmed that flow velocities at a real scale could be brought back in the channel in case the sediments were put into the channel. Next, driftwoods were flowed in state of only water or using sediments in water. Hereupon, driftwoods were not peeled off in fresh water and were peeled off in using sediment.