Two-Dimensional Solution for Straight and Meandering Overbank Flows
Two-Dimensional Solution for Straight and Meandering Overbank Flows
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DOI：
10.1061/(asce)0733-9429(2000)126:9(653
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发表时间：
2000-09
影响因子：
2.4
通讯作者：
D. Ervine;K. Babaeyan-Koopaei;R. Sellin
中科院分区：
文献类型：
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作者：
D. Ervine;K. Babaeyan-Koopaei;R. Sellin
本文提出了一种预测直流和曲流溢流的深度平均速度和剪应力的实用方法。提出了纳维-斯托克斯方程的深度积分湍流形式的解析解，除了床摩擦之外，还包括横向剪切和二次流。本方法的新颖性不仅在于其在配方中包含二次流，而且还在于其对直线和蜿蜒通道的适用性。该解析解在模型和场尺度上应用于多个通道，并且还与其他可用方法（例如 Shiono 和 Knight 的方法以及横向分布方法）进行了比较。目前的公式可以更好地预测速度和剪切应力，特别是在二次流占主导地位的情况下。
This paper presents a practical method to predict depth-averaged velocity and shear stress for straight and meandering overbank flows. An analytical solution to the depth-integrated turbulent form of the Navier-Stokes equation is presented that includes lateral shear and secondary flows in addition to bed friction. The novelty of the present approach is not only its inclusion of the secondary flows in the formulation but also its applicability to straight and meandering channels. The analytical solution is applied to a number of channels, at model and field scales, and is also compared with other available methods such as that of Shiono and Knight and the lateral distribution method. The present formulation gives much better predictions of velocity and shear stress, particularly in those cases where the secondary flows are dominant.