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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Three-dimensional flow modelling and sediment transport in the River Klaralven
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Three-dimensional flow modelling and sediment transport in the River Klaralven

机译：克拉拉芬河的三维流模拟和泥沙输送

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摘要

A three-dimensional flow model that uses the RNG k-ε turbulence model and a non-equilibrium wall function was applied to the River Klar?lven in the southwest part of Sweden. The objectives were to study the nature of the flow in the river bifurcation and to investigate the short-term sediment transport patterns in the river. The effectiveness of three-dimensional flow models depends upon: (1) how well the river geometry and it surface roughness are modelled; and (2) the choice of the closure model. Improvements were obtained by modelling the river in two parts: the entire river reach, and a selected part. Composite Manning coefficients were used to account for roughness properties. The method requires a calibration process that ensures the water surface profiles match the field data. The k-ε model under-predicted both the extent of flow separation zones and the number of secondary flow regions having a spiral motion, in comparison with the RNG k- model. The 3-D model could predict with good accuracy both the general and secondary flow fields in the river. The results agreed well with the 3-D velocity measurements using an acoustic Doppler current profiler. A conceptual model was developed that accounts for the development of secondary flows in a river bifurcation having two bends. The main flow feature in the river cross-sections was the existence of multiple counter-rotating spiral motions. The number of spiral motions increased as the river bends were approached. The river bends also caused vorticity intensification and increased the vertical velocities. The application of the 3-D flow model was extended by solving the sediment continuity equation. The sediment transport patterns were related to the secondary flow fields in the river. The sediment transport patterns at the river bifurcations are characterized by the growth of a sandbank.
机译：使用RNGk-ε湍流模型和非平衡壁函数的三维流动模型应用于瑞典西南部的克拉夫芬河。目的是研究河流分叉处的水流性质，并研究河流中的短期泥沙输送方式。三维流动模型的有效性取决于：（1）对河流几何形状及其表面粗糙度的建模程度如何; （2）封闭模型的选择。通过将河流分为两部分来获得改进：整个河流段和选定部分。复合曼宁系数用于说明粗糙度属性。该方法需要校准过程，以确保水面轮廓与现场数据匹配。与RNG k模型相比，k-ε模型预测了分离区域的范围和具有螺旋运动的二次流动区域的数量。 3-D模型可以很好地预测河流的一般流场和次要流场。结果与使用声学多普勒电流剖面仪进行的3-D速度测量非常吻合。建立了一个概念模型，该模型考虑了具有两个弯头的河流分岔中二次流的发展。河流横截面的主要流动特征是存在多个反向旋转的螺旋运动。随着靠近河弯，螺旋运动的数量增加。河流弯曲还引起涡度加剧并增加了垂直速度。通过求解沉积物连续性方程扩展了3-D流动模型的应用。沉积物的运移方式与河流的二次流场有关。河流分叉处的泥沙输送模式的特征是沙洲的增长。

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