4:15 PM - 4:30 PM
[HGM22-04] Slope failure of the Oya-Kuzure and generation of the Akamizu Fall, upper reaches of the Abe River, Shizuoka Prefecture
Keywords:debris flow deposit, shortcut, Abe River, Akamizu Fall, Oya-Kuzure
Although origin of the Akamizu Fall, which is located on main stream of the Abe River with a height of 60 m has been inferred as that stream of the river eroded debris flow deposit filling the valley, that stream of the river flowed across a ridge, and so on, any opinion does not show evidence sufficiently.
As a result of survey, it were confirmed that distribution of debris flow deposits and paleo-current estimated from direction of gravel imbrication in the deposits imply meandering of the Abe River valley before burial by debris flow deposit. In addition, channel of the fall across a ridge of basement rock. We concluded that filling of a valley by debris flow deposit caused shortcut of stream of the Abe River across a ridge and generation of the Akamizu Fall.