The effect of end-sill layout on the downstream local scour of gravelly bed
碩士 === 國立中央大學 === 土木工程研究所 === 91 === Abstract In order to protect the dams or weirs, many energy dissipaters such as apron, sills to aid in energy dissipation or to deflect high velocity flow away from the channel bed. This study examine the effect of angle of sills and the tailwater depth related...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2003
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| Online Access: | http://ndltd.ncl.edu.tw/handle/66972915663541732751 |
| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 91 === Abstract
In order to protect the dams or weirs, many energy dissipaters such as apron, sills to aid in energy dissipation or to deflect high velocity flow away from the channel bed. This study examine the effect of angle of sills and the tailwater depth related to the scour mechanism. The characteristics of the scour profile shows strong dependence on the tailwater depth..
There are three series of experiments in this study : the plane wall jet (no sills)，the wall jet with a rectangle sill , and the wall jet with a trapezoid sill. The experiments were preformed with clear water and homogeneous sand beds.
According to experimental data, the trapezoid sill with the angle of
30°is the best design for protection of the downstream riverbed near those structures, and this angle is proposed for the design of the sills.
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