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工程科学与技术:2006,38(6):43-46
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卵石推移质输移脉动特性研究
(四川大学 水力学与山区河流开发保护国家重点实验室,四川 成都 610065)
Study on Fluctuation Nature of Gravel Bedload Transport
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投稿时间:2005-12-07    
中文摘要: 为了探明卵石推移质输移脉动特性,对卵石推移质输沙率脉动试验野外实测资料进行了统计分析。实测资料结果表明,卵石推移质输沙率过程具有明显的随机性,其表征卵石推移质输沙脉动特性的特征值与采样历时密切相关。卵石推移质单宽输沙率的脉动标准差、离差系数、无量纲脉动强度以及无量纲极差值均随采样历时增加而减小。单宽输沙率的无量纲极差值最大为8.0左右,当采样历时t≥600 s时,无量纲极差值Z≤4.0,当采样历时t≥2400 s时,无量纲极差值Z≤2.0。单宽输沙率的离差系数最大为2.0左右,当采样历时t≥1200 s时,离差系数Cv≤1.0,当采样历时t≥3000 s时,离差系数Cv≤0.5。单宽输沙率的无量纲脉动强度最大为10.0左右,当采样历时t≥1200 s时,无量纲脉动强度E′≤5.0,当采样历时t≥3600 s时,无量纲脉动强度E′≤2.0。
中文关键词: 脉动特性  卵石推移质  采样历时
Abstract:By the analysis of the field data of gravel bedload rate, it is found that the gravel bedload rate has a distinct stochastic nature and turbulence intensity of bedload rate is closely related to the sampling duration. The deviation, diversity coefficient,dimensionless turbulence intensity and dimensionless ultimate difference of bedload rate per unit width, all decrease with the increase of sampling duration. The maximum value of dimensionless ultimate difference of bedload rate per unit width is about 8.0. As the sampling duration t≥600 s, the dimensionless ultimate difference Z≤4.0. As the sampling duration t≥2400 s, the dimensionless ultimate difference Z≤2.0. The deviation coefficient of bedload rate per unit width has a maximum value of 2.0. As the sampling duration t≥1200 s, the deviation coefficient Cv≤1.0. As the sampling duration t≥3000 s, the deviation coefficient Cv≤0.5. The dimensionless turbulence intensity of bedload rate per unit width has a maximum value of 10.0. As the sampling duration t≥1200 s, the dimensionless turbulence intensity E′≤5.0. As the sampling duration t≥3600 s, the dimensionless turbulence intensity E′≤2.0.
文章编号:20060609     中图分类号:    文献标志码:
基金项目:973资助项目(2003CB415202)
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聂锐华,刘兴年,黄尔.卵石推移质输移脉动特性研究[J].工程科学与技术,2006,38(6):43-46.
.Study on Fluctuation Nature of Gravel Bedload Transport[J].Advanced Engineering Sciences,2006,38(6):43-46.