| 天然河流平面二维动床阻力问题研究 |
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| 引用本文： | 吴伟明.天然河流平面二维动床阻力问题研究[J].武汉大学学报(工学版),1996(3). |
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| 作者姓名： | 吴伟明 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 利用天然河流垂线流速分布实测资料确定平面二维动床摩阻流速ｕ和当量糙度Ｋ′ｓ，由此建立了垂线上系数Ａ与参数Ｕ／Ｕｃ、系数Ａ与参数ｕ／ｇｄｓ０以及当量糙度Ｋ′ｓ与参数ｕ／ｇｄｓ０、ｕＫ′ｓ／ν的经验关系；利用糙率公式ｎ＝Δ１／６／Ａ确定动床当量糙度Δ，并得到Δ与Ｕ／Ｕｃ、ｕ／ｇｄｓ０的关系
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| 关 键 词： | 河床糙率 流速分布 河川水力学 动床阻力 |
Study of Resistance to Two dimensional Movable bed in Natural River |
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| Wu Weiming.Study of Resistance to Two dimensional Movable bed in Natural River[J].Engineering Journal of Wuhan University,1996(3). |
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| Authors: | Wu Weiming |
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| Affiliation: | Department of River Engineering |
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| Abstract: | In this paper the field data of velocity profile along vertical line in natural river are used to determine two dimensional shear velocity u * and roughness K ′ s on movable bed.Then some empiric relations about two dimensional movable bed resistance,such as A～U/U c ,A～u */gd s 0 and K ′ s ～(u */gd s 0 ,u *K ′ s /ν) ,are obtained.Movable bed rounghness Δ is also determined by using rounghness formula n=Δ 1/6 /A 0 and the relation between Δ and U/U c ,u */gd s 0 is established. |
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| Keywords: | bed roughness flow velocity distribution fluvial hydraulics movable bed resistance |
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