Author(s): Kazushi Nomura; Yasunori Muto; Takao Tamura
Linked Author(s): Yasunori Muto
Keywords: Channel transition processes; Natural and artificial impact; Sandbar deformation; River channel fluctuation; Grain distribution change
Abstract: River improvement works to reduce damage from the floods have been conducted which attain increase of the discharge capacity. On the other hand, local sediment deposition and scouring are growing concern by the repeated floods, decreasing of sediment supply and construction of river structure. In order to resolve these problems, it is necessary to understand the effects of natural and artificial impacts on the river channel. Moreover, future plans as sediment management and operation of river structure must be discussed. In this paper, the channel transition processes were studied in the Middle Yoshino River using aerial photo, morphology data and record of gravel gathering. Natural and artificial impacts on those processes were evaluated from sandbar deformation, river channel fluctuation. As a result, sandbar deformation by the floods and revetment works was confirmed. The floods and dam construction affected fluctuation of river channel with the sediment deposition and scouring.
Year: 2014