| SEDIMENT TRANSPORT CAPACITY -AN IMPROVED BAGNOLD FORMULA |
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| 作者姓名： | Shu-Qing YANG Sung-Cheol KOH In-Soo KIM Young-Chae SONG |
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| 作者单位： | Assoc. Prof. Div. of Civil and Environmental Engrg. College of Engrg. Korea Maritime Univ. Busan Korea 606791.，Prof.Div. of Civil and Environmental Engrg. College of Engrg. Korea Maritime Univ. Busan Korea 606791.，Prof.Div. of Civil and Environmental Engrg. College of Engrg. Korea Maritime Univ. Busan Korea 606791. |
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| 摘 要： | This paper re-examines Bagnold’s theorem of sediment transport. Different from the stream power defined by Bagnold, i.e., τoV, this study shows that the total load of sediment-laden flow, gt, is related to near bed energy dissipation rate, i.e., τou*’. An attempt is made to explain the empirical relation. The ratio (=k) of measured total load, gt, to the product of near bed velocity, u*’, and energy dissipation rate, τou*’, is analyzed. It is found that k is independent of the Rouse number, Z, if Z is greater than 2.6, but the coefficient k decreases with the increase of Z when Z < 2.6. An empirical relation between k and Z is developed. A systematic and thorough analysis of 1,458 sets of data collected from 16 rivers and canals confirms that the proposed formula can be used to compute the total load with accuracy.
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| 关 键 词： | 河流 输沙能力 总输沙量 改良BAGNOLD公式 |
| 收稿时间： | 2005-12 |
| 修稿时间： | 2006-03 |
SEDIMENT TRANSPORT CAPACITY-AN IMPROVED BAGNOLD FORMULA |
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| Shu-Qing YANG Sung-Cheol KOH In-Soo KIM Young-Chae SONG.SEDIMENT TRANSPORT CAPACITY -AN IMPROVED BAGNOLD FORMULA[J].International Journal of Sediment Research,2007,22(1):27-38. |
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| Authors: | Shu-Qing YANG Sung-Cheol KOH In-Soo KIM Young-Chae SONG |
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| Abstract: | This paper re-examines Bagnold's theorem of sediment transport. Different from the stream power defined by Bagnold, i.e., τoV, this study shows that the total load of sediment-laden flow, gt, is related to near bed energy dissipation rate, i.e., τou*'. An attempt is made to explain the empirical relation. The ratio (=k) of measured total load, gt, to the product of near bed velocity, u*', and energy dissipation rate, τou*', is analyzed. It is found that k is independent of the Rouse number, Z, if Z is greater than 2.6, but the coefficient k decreases with the increase of Z when Z ＜ 2.6. An empirical relation between k and Z is developed. A systematic and thorough analysis of 1,458 sets of data collected from 16 rivers and canals confirms that the proposed formula can be used to compute the total load with accuracy. |
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| Keywords: | Sediment transport River flow Total sediment discharge Stream power |
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