| 高拱坝表孔及中孔挑流水舌上下碰撞作用下基岩冲刷 |
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| 引用本文： | 孙建,李玉柱,余常昭.高拱坝表孔及中孔挑流水舌上下碰撞作用下基岩冲刷[J].清华大学学报(自然科学版),2002,42(4):564-568. |
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| 作者姓名： | 孙建 李玉柱 余常昭 |
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| 作者单位： | 清华大学水利水电工程系,北京,100084 |
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| 基金项目： | 国家“九五”重点科技攻关项目 ( 96-2 2 1-0 5 -0 1-0 2 ) |
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| 摘 要： | 分析了表孔及中孔挑流水舌上下碰撞能量损失、 3 -D扩散和漏碰等水力特点 ,用动量方程和水舌空中扩散宽度沿程变化规律导出 3 - D碰撞流速、碰撞效率和碰撞能量损失 ,得出碰撞最佳水力条件。分析碰撞水舌对基岩冲刷特点 ,提出表、中孔水舌上下碰撞作用下基岩冲刷平衡深度估算方法。小湾表孔、中孔碰撞工况下基岩冲刷试验表明 ,预报值和试验值在各级库水位下基本吻合。研究表明预报方法可行的
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| 关 键 词： | 高拱坝 挑流水舌 冲刷平衡深度 |
| 文章编号： | 1000-0054(2002)04-0564-05 |
| 修稿时间： | 2000年11月21 |
Limiting scour depth by the interaction of water jets from surface outlets with jets from mid-level outlets in high arch dams |
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| SUN Jian,LI Yuzhu,YU Changzhao.Limiting scour depth by the interaction of water jets from surface outlets with jets from mid-level outlets in high arch dams[J].Journal of Tsinghua University(Science and Technology),2002,42(4):564-568. |
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| Authors: | SUN Jian LI Yuzhu YU Changzhao |
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| Abstract: | A hydraulic model was developed to analyze the interaction between two interactivity jets to reduce the scour depth due to jets from high arch dams. The model was used to analyse the hydraulic characteristics such as energy loss, three dimensional diffusion and leakage collision, and to calculate the velocity magnitude and direction after the interaction and the energy loss by the momentum equation and the jet width. Based on the model above, a hydraulic method to calculate the scour depth was proposed. The calculated results compare well with experimental data from the Xiaowan Project for various water levels and river rock scales. |
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| Keywords: | high arch dam water jets scour depth |
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