By Shoji Fukuoka, Hajime Nakagawa, Tetsuya Sumi, Hao Zhang

Sediments, which represent the outside of the Earth, commence their trip to rivers with the strength got from rainfalls, fl oods and different typical tactics. because of delivery of sediments, rivers improve with numerous appearances and features, and play an important position within the actions of humans and the existence cycles of different species. River sediment, as a traditional subject for river administration, has been the Read more...

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And Satofuka, Y. 2002. Sediment flushing from reservoirs using a reverse flow system, Proc. Intern. Symposium on Hydraulic and Hydrological Aspect of Reliability and Safety Assessment of Hydraulic Structures, Sankt-Peterburg. Takahashi, T. 2006. Sediment runoff phenomena and the counter-measures for sediment hazards, Nagoya: Kinmiraisha (in Japanese). Takahashi, T. 2007. Debris flow; Mechanics, prediction and countermeasures, London: Taylor & Francis. Takahashi, T. 2013. ), London: Taylor & Francis.

12) cannot be sluiced. This is the reason why the dilution by keeping the water supply of 50 m3/s from the A ravine side even after the switching of flow to B ravine side is recommended. Although the capacity of the tunnel guarantees the safe sluicing of the flushed water and sediment under normal condition, an abnormally large amount of sediment might happen to inflow and so the flow in the tunnel could not keep an open channel flow; in the worst case the tunnel might be clogged. For the sake to avoid such a hazardous situation the similar inlet structure to that of the Asahi dam bypass system can be adopted.

Indb 9 7/22/2013 2:28:52 PM large amount of suspended sediment is contained in the flow. SERMOW and SERMOW ver. 2 calculate flood runoff discharge hydrograph at an arbitrary site in the stream channel system within a watershed using the kinematic wave method by giving a time series of rainfalls. The same rainfalls produce and move sediment on the bare-slopes that are left after landslides and the moved sediment is once deposited on the taluses existing at the foot of the slopes. The amount of sediment produced and moved on the slope is assumed to be proportional to the rainfall intensity in excess of a threshold value, where the threshold rainfall intensity is determined as a decreasing function of an increasing cumulative rainfall, so the larger the cumulative rainfall the larger the supply of sediment to the talus becomes under a certain rainfall intensity.

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