Non-Uniform Sediment Transport Downstream from Reservoir |
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| Authors: | LI Yitian CHEN Fei |
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| Institution: | State Key Laboratory of Water Resources and Hydropower Engineering Sciences,Wuhan University, Wuhan 430072, China |
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| Abstract: | The transport characters of non-uniform sediment before and after the reservoir operation are compared and analyzed. Field
data from the Three Gorges Reservoir (TGR), Danjiangkou, and Sanmenxia reservoir indicate that the transport character of
coarse particle is various in different reaches. Before the reservoir operation, the dramatic decrease of the hydraulic condition
in some reaches is the main reason to cause the coarse particle deposited. After the reservoir operation, almost all grain
sized sediment may be eroded, when the reach is eroded seriously. However, the transport character of the coarse particle
will be consistent with what it was before, when the reach is not eroded seriously. The deposition amount will be less than
its pre-dam value, and it will tend to decrease with the time going on. Erosion of fine particle results from its unsaturation.
Long-distance erosion downstream from reservoir is caused by shortage of the supply from riverbed, especially the shortage
of fine particle.
Supported by the National Basic Research Program of China(“973” Program, No.2003CB415200).
LI Yitian, born in 1957, male, Prof. |
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| Keywords: | downstream from reservoir grain sized sediment hydraulic condition |
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