By Shoji Fukuoka, Hajime Nakagawa, Tetsuya Sumi, Hao Zhang
Sediments, which represent the outside of the Earth, commence their trip to rivers with the power got from rainfalls, fl oods and different traditional strategies. because of shipping of sediments, rivers increase with numerous appearances and services, and play a vital function within the actions of people and the existence cycles of alternative species. River sediment, as a traditional subject for river administration, has been the subject of constant examine considering the fact that precedent days, and because then major progresses in river sediment study has been made. these days, river sediment is way extra hooked up to. Read more...
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Additional resources for Advances in River Sediment Research
Indb 7 7/22/2013 2:28:52 PM Figure 2. Concept of a reverse-flow sediment flushing system. The key points of the idea are as follows: 5. It is desirable to use no power to introduce reverse flow into the sedimentation pool. To meet this requirement the crest height of the partition weir (bank) is set equal to the high water level of the main reservoir and the reverse flow is produced by the head difference between the main reservoir and the sedimentation pool. Therefore, the water stored in the sedimentation pool must be released and the pool must be nearly dry before the flushing operation.
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. The sketch of the inlet structure is given in Figure 13. indb 16 7/22/2013 2:28:55 PM Figure 13.
The density current bed together with the coarse delta deposit must be flushed out after the termination of flood by introducing the reverse flow. The discussion above is only a rough estimate of the function of the reverse flow system to mitigate the turbidity of the reservoir. The phenomena in the sedimentation pool are highly complicated and a detailed three dimensional analysis is necessary. diameter. 02 mm are settled down onto the bottom of the sedimentation pool in front of the front-set bed of the delta deposit.