Application of analytical solutions in trapezoidal compound channel flow
Application of analytical solutions in trapezoidal compound channel flow
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解析解在梯形复合通道流动中的应用
DOI：
10.1002/rra.1433
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发表时间：
2012-01
影响因子：
2.2
通讯作者：
Huai, W. X.
中科院分区：
文献类型：
--
作者：
Zeng, Y. H.;Guymer, I.;Spence, K. J.;Huai, W. X.
用解析模型预测横向水深变化明渠水流的精度会受到摩擦系数和无因次涡动粘性的影响。本文通过对对称梯形复式河槽的分析结果与试验结果的比较，讨论了确定这两个参数的不同方法。为反映湿周沿着不同的水力特性，将梯形断面划分为若干子断面，采用当地水力参数，采用曼宁公式计算各子断面的摩阻系数。主渠道和边坡的湿润周长包括面板之间的界面，以反映横向动量交换的影响。这种方法被证明是有效的，一旦粗糙度系数和水力半径在不同的子区域已经确定。结果表明，摩擦系数是影响解析解精度的主要参数。无量纲涡动粘度对预测精度的影响要小得多，这意味着对于实际应用，无量纲涡动粘度可以凭经验确定。在模型中加入二次流项可以改善预测，特别是在从主槽到漫滩的过渡中。得到了该区域深度平均雷诺应力横向分布的合理预测。版权所有© 2010约翰威利父子有限公司.
The accuracy of predictions using an analytical model for a lateral depth varying open channel flow can be affected by the friction factor and the dimensionless eddy viscosity. In this paper, different approaches to determine these two parameters are discussed by comparing analytical results with experimental data obtained from a symmetrical trapezoidal compound open channel. To reflect different hydraulic characteristics along the wetted perimeter, the trapezoidal cross‐section was divided into several sub‐sections, and the friction factor in each sub‐section was calculated with Manning's formula by adopting local hydraulic parameters. The wetted perimeters of main channel and side slope included the interface between panels to reflect the effects of the lateral momentum exchange. This approach is shown to be effective once the roughness coefficients and hydraulic radius in different sub‐regions have been determined. The results show that the friction factor is the major parameter affecting the accuracy of the analytical solution. The effect of dimensionless eddy viscosity on the precision of predictions is much smaller, which means that for practical applications, the dimensionless eddy viscosity can be determined empirically. Inclusion of a term for secondary flows in the model can improve the prediction, especially in the transition from main channel to the floodplain. A reasonable prediction of the lateral distribution of depth mean Reynolds' stress in this region is obtained. Copyright © 2010 John Wiley & Sons, Ltd.
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DOI：
10.1680/iwtme.1999.31426
发表时间：
1999-06
期刊：
--
影响因子：
--
作者：
W. Myers;D. Knight;J. Lyness;J. Cassells;F. Brown
通讯作者：
W. Myers;D. Knight;J. Lyness;J. Cassells;F. Brown
DOI：
10.1680/wame.2003.156.3.225
发表时间：
2003-09
期刊：
--
影响因子：
--
作者：
J. Spooner;K. Shiono
通讯作者：
J. Spooner;K. Shiono
影响因子：
4.7
作者：
Liao, Huasheng;Knight, Donald W.
通讯作者：
Knight, Donald W.
影响因子：
2.3
作者：
K. Shiono;C. Scott;D. Kearney
通讯作者：
K. Shiono;C. Scott;D. Kearney
影响因子：
2.4
作者：
D. Ervine;K. Babaeyan-Koopaei;R. Sellin
通讯作者：
D. Ervine;K. Babaeyan-Koopaei;R. Sellin