Modelling of meandering channels for overbank flow
Modelling of meandering channels for overbank flow
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DOI：
10.1680/wame.2003.156.3.225
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发表时间：
2003-09
期刊：
影响因子：
--
通讯作者：
J. Spooner;K. Shiono
中科院分区：
文献类型：
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作者：
J. Spooner;K. Shiono
考虑了曲线坐标下的顺流方向深度平均运动方程。利用速度和边界剪应力研究了该方法在曲流河道上的应用。用激光多普勒风速仪和普雷斯顿管分别测量了风速和边界剪应力。运动方程中的平流和床层摩擦项显著，而横流湍流在顶点段不显著。结果，运动方程大大简化了。用数据标定平流项得到两个方程。这些结果对不同尺度曲流河道顶点段的流速进行了较好的预测。对不同尺度水槽数据的平流项的研究表明，它对小水槽很重要，但在大水槽中往往不那么重要。
The depth-averaged equation of motion in the stream-wise direction with curvilinear coordinates was considered. Its application to a meandering channel for over-bank flow was investigated using velocity and boundary shear stress. The velocity and boundary shear stress were measured using a laser Doppler anemometer and Preston tube respectively. The advection and bed friction terms in the equation of motion were found to be significant, but the transverse turbulence was found to be insignificant at the apex section. As a result the equation of motion was considerably simplified. The calibrating advection term with the data gave two equations. These gave a good prediction of velocity across the apex section for different scales of meandering channels. The investigation of the advection term with varying scaled flume data suggested that it is important for a small flume, but tends to be less significant in a large flume.