By Shoji Fukuoka, Hajime Nakagawa, Tetsuya Sumi, Hao Zhang
Sediments, which represent the skin of the Earth, commence their trip to rivers with the power bought from rainfalls, fl oods and different ordinary techniques. as a result of shipping of sediments, rivers enhance with a number of appearances and features, and play a vital position within the actions of humans and the existence cycles of different species. River sediment, as a standard subject for river administration, has been the subject of constant learn in view that precedent days, and because then major progresses in river sediment examine has been made. these days, river sediment is way extra attached to. Read more...
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Extra info for Advances in River Sediment Research
02 mm in Figure 14. Flow depth, velocity and sediment discharge versus the total discharges in the tunnel. decreased, then the water stage just upstream of the inlet rises. When the water stage becomes well higher than the opening of the curtain wall, the curtain wall forcibly produces an orifice flow and controls the amount of inflow to the tunnel. Simultaneously, due to the rising of water stage upstream of the inlet, sediment inflow is decreased. In due time, sediment accumulated on the bottom of the tunnel is naturally removed and the conveyance ability of the tunnel is automatically revived (Harada et al.
Being the aqueduct set as oblique to the front-set slope of the delta, the high speed flow that spills over the aqueduct makes a curved flow with a large radius of curvature and it violently scour the delta and entrains thus scoured sediment into the flow to be finally flushed out of the sedimentation pool via the bypass tunnel. The overflowing wall of the aqueduct is tapered down towards the tip of the channel and so no overflow takes place upstream the intersection point. As time goes by, the intersection point proceeds towards the downstream of the aqueduct and the erosion of the delta deposit proceeds.
JSECE, 55(3) (in Japanese). Takahashi, T. Nakagawa, H. 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.
Advances in River Sediment Research by Shoji Fukuoka, Hajime Nakagawa, Tetsuya Sumi, Hao Zhang