| Shear Flow Dispersion Under Wave and Current |
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| 作者姓名： | Sandeep PATIL A. K. RASTOGI 张庆河 Rajeev MISRA S. K. UKRANDE |
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| 作者单位： | [1]Biological and Agricultural Engineering, Texas A ＆ M University, Texas, USA [2]Department of Civil Engineering, Indtian Institute of Technology, Bombay, India [3]School of Civil Engineering, Tianjin University, Tianjin 300072, China [4]Water and Power Consultants, New Delhi, India [5]MGM College of Engineering, New Bombay, India |
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| 摘 要： | The longitudinal dispersion of solute in open channel flow with short period progressive waves is investigated. The waves induce second order drift velocity in the direction of propagation and enhance the mixing process in concurrent direction. The 1-D wave-period-averaged dispersion equation is derived and an expression for the wave-current induced longitudinal dispersion coefficient (WCLDC) is proposed based on Fischer's expression (1979) for dispersion in unidirectional flow. The result shows that the effect of waves on dispersion is mainly due to the cross-sectional variation of the drift velocity. Furthermore, to obtain a more practical expression of the WCLDC, the longitudinal dispersion coefficient due to Seo and Cheong (1998) is modified to incluee the effect of drift velocity. Laboratory experiments have been conducted to verify the proposed expression. The experimental results, together with dimensional analysis, show that the wave effect can be reflected by the ratio between the wave amplitude and wave period. A comparative study between the cases with and without waves demonstrates that the magnitude of the longitudinal dispersion coefficient is increased under the presence of waves.
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| 关 键 词： | 剪切流 海洋 波浪 散布规律 |
Shear Flow Dispersion Under Wave and Current |
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| Sandeep PATIL,A. K. RASTOGI,ZHANG Qing-he,Rajeev MISRA,S. K. UKRANDE.Shear Flow Dispersion Under Wave and Current[J].China Ocean Engineering,2007,21(4):549-560. |
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| Authors: | Sandeep PATIL A K RASTOGI ZHANG Qing-he Rajeev MISRA S K UKRANDE |
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| Abstract: | The longitudinal dispersion of solute in open channel flow with short period progressive waves is investigated. The waves induce second order drift velocity in the direction of propagation and enhance the mixing process in concurrent direction. The 1-D wave-period-averaged dispersion equation is derived and an expression for the wave-current induced longitudinal dispersion coefficient (WCLDC) is proposed based on Fischer's expression (1979) for dispersion in unidirectional flow. The result shows that the effect of waves on dispersion is mainly due to the cross-sectional variation of the drift velocity. Furthermore, to obtain a more practical expression of the WCLDC, the longitudinal dispersion coefficient due to Seo and Cheong (1998) is modified to incluee the effect of drift velocity. Laboratory experiments have been conducted to verify the proposed expression. The experimental results, together with dimensional analysis, show that the wave effect can be reflected by the ratio between the wave amplitude and wave period. A comparative study between the cases with and without waves demonstrates that the magnitude of the longitudinal dispersion coefficient is increased under the presence of waves. |
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| Keywords: | longitudinal dispersion under wave-current flow drift velocity multiple regression analysis |
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