| 非均匀沙起动研究 |
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| 引用本文： | 何文社,方铎,杨胜发,杨具瑞,刘兴年. 非均匀沙起动研究[J]. 水力发电学报, 2002, 0(2): 72-77 |
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| 作者姓名： | 何文社 方铎 杨胜发 杨具瑞 刘兴年 |
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| 作者单位： | 四川大学高速水力学国家重点实验室,成都,610065 |
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| 基金项目： | 国家自然科学基金和水利部联合资助重大项目 (5 9890 2 0 0 )，九五课题资助 (95 -5 -4) |
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| 摘 要： | 非均匀沙运动规律与均匀沙明显不同。本文从非均匀沙起动的特点出发，阐述了其运动机理，采用滚动起动模式。通过对附加质量力的概念及表达式和相对暴露度参数的引入，推出了非均匀沙起动公式。并用实测资料进行了验证，同其它学者们的公式相比较为合理。同时得到了均匀沙的起动公式，其系数涵盖了其它均匀沙公式。说明本文公式较好的反映了非均匀沙的起动特性。
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| 关 键 词： | 非均匀沙 起动公式 相对暴露度 附加质量力 切应力 |
| 修稿时间： | 2001-05-28 |
Study on laws of threshold motion for non-uniform sediment |
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| He Wenshe Fang Duo Yang Shengfa Yang Jurui Liu Xingnian. Study on laws of threshold motion for non-uniform sediment[J]. Journal of Hydroelectric Engineering, 2002, 0(2): 72-77 |
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| Authors: | He Wenshe Fang Duo Yang Shengfa Yang Jurui Liu Xingnian |
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| Abstract: | Obvious differences of transport mechanism exist between the uniform and non uniform sediment.In this paper,the formula of calculation threshold velocity of non uniform sediment is established in consideration of their relative degree of exposure,and the additional mass force,etc.Coefficients in the formula are determined based on the experiments and field data.The theoretical formula has been verified with factual data,it's the better reasonable formula compare with the others that we collected.The computed results reflect the characterisitcs of threshold motion of non uniform sediment.The formula for uniform sediment is established also, its coefficients include others formula. |
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| Keywords: | non uniform sediment formula of threshold velocity relative degree of exposure additional mass force the flow shear stress |
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