BACKWATER EFFECTS OF PIERS IN SUBCRITICAL FLOW

BACKWATER EFFECTS OF PIERS IN SUBCRITICAL FLOW
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发表时间：
2001-10
期刊：
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影响因子：
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通讯作者：
R. Charbeneau;E. Holley
R. Charbeneau;E. Holley
中科院分区：
其他
文献类型：
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作者：
R. Charbeneau;E. Holley

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桥梁结构的建造或翻新可能需要在天然水道的渠道或河漫滩内放置桥墩。这些桥墩将阻碍水流，并可能导致桥梁结构上游水位升高。由于桥墩的存在而引起的水位上升称为回水。在这项实验研究中，在实验室中研究了不同桥墩尺寸和一系列亚临界水流条件下桥墩引起的回水效应。在两个研究项目中，测量了水位变化和桥墩上的拖曳力。研究结果表明，采用标准公式计算回水会高估水位的增长。提出了一种改进的回水计算公式。
Construction or renovation of bridge structures may require placement of bridge piers within the channel or floodplain of natural waterways. These piers will obstruct the flow and may cause an increase in water levels upstream of the bridge structure. The water level increase caused by the presence of bridge piers is called backwater. In this experimental research, the backwater effects caused by bridge piers were investigated in the laboratory for different pier sizes and for a range of subcritical flow conditions. Both water level changes and drag forces on bridge piers were measured during two research programs. The results from this research suggest that use of standard formula for calculation of backwater will over-predict water level increases. An improved formula for calculating backwater is presented.