CALCULATION OF BED VARIATION IN ALLUVIAL CHANNELS
CALCULATION OF BED VARIATION IN ALLUVIAL CHANNELS
复制标题
冲积河道床层变化的计算
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
T. Itakura
中科院分区：
文献类型：
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作者：
Y. Shimizu;T. Itakura
为了建立一个简单的数值模型来预测实际河流的河床地形变化，应用了一个深度平均的数值模型来评估冲积河流的河床地形变化。利用该模型对对称和非对称曲流环进行了数值模拟。模拟结果与实验结果吻合较好。并将该模型应用于直槽中尺度床型的发展。研究了曲流河道中沙坝的运移速度。在冲积河流中，水力条件和平面几何之间的相互作用导致了不同类型的河床混杂，这些混杂高度依赖于沙洲的形成、停止和迁移。研究表明，在给定的水力和几何条件下，二维模型能较好地预测这些现象，具有一定的工程实用价值。
In an effort to develop a simple numerical model to predict the variation of bed topography in real-worked rivers, a depth-averaged numerical model was applied to evaluate the variation of the bed topography in alluvial streams. The model was used to simulate the symmetric and asymmetric meander loops. The simulated results showed good agreement with experimental results. Applications of the model to the development of meso-scale bed configurations in straight channels were also performed. The migration velocity of bars in meandering channels was investigated. In alluvial rivers, the interactions between hydraulic conditions and plan geometries result in different kinds of bed confugurations that are highly dependent on formation, cessation, and migration of bars. The study shows that the 2-dimensional model can predict these phenomena for given hydraulic and geometric conditions, which may be useful in practical engineering works.