Abstract
Woody debris (WD) in rivers are mainly caused by a combination of biological, physical and artificial factors. Furthermore, by the frequency of strong torrential rains due to the global warming, large scale disasters due to WD have become more frequent in recent years in Japan. For the effective countermeasure against these disasters, it is important to deepen the understanding a series of WD transport process, which are generation, sedimentation/transportation, and discharge. In this research, we developed a prototype of the world’s first physical model based on a series of WD transport process and estimate WD sedimentation in 5 dam reservoirs in Kitakami River.
The Nash-Sutcliffe values were 0.7 or more for WD transport calculated using this model except the Shijusida dam reservoir. From the comparison of storage parameters in this model, the Yuda and Gosho dams have relatively much WD sedimentation in the watershed than the Tase and Ishibuchi dams.
