River during flood
- During a flood, a river is brown and muddy. This is due to the sediment transport with water.
in normal
flooding
Fig. A river in normal and flooding conditions [https://www.river.go.jp/index]
- The amount (concentration) of sediment transport depends on the flow of the river and catchment characteristics.
Fig. Confluence of Arve and Rhone rivers : [https://unsplash.com/]
多摩川と日原川の合流点
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Fig. Confluence of Tama and Nippara rivers
Sediment transport in a river during a flood
There are different sizes of sediment during a flood: coarse sediment rolling along the river bed, slightly fine sediment jumping from the river bed, and much finer sediment suspending in water.
What is “Sediment Hydraulics”?
- A discipline that addresses problems caused by sediment transport in a river
- Although it is a part of hydraulics, it is often treated independently as “Sediment Hydraulics,” “Hydraulics of Sediment Transport,” etc.
- Many points are not yet clarified academically and have not been systematized.
- Difficulty is high in hydraulics.
- These classes of hydraulics are not really studied.
Key words of “Sediment Hydraulics”
“Sediment Transport”
- The sentiment moved by river flow
“River Bed Variation”
- The riverbed shape changes due to sediment transport imbalance.