NUMERICAL CALCULATION OF BED DEFORMATION IN BRAIDED STREAM WITH EMERGED MID-CHANNEL BARS
NUMERICAL CALCULATION OF BED DEFORMATION IN BRAIDED STREAM WITH EMERGED MID-CHANNEL BARS
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中通道杆出现的辫状河床变形的数值计算
DOI：
10.2208/prohe.46.743
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Y. Shimizu
中科院分区：
文献类型：
--
作者：
H. Kurabayashi;Y. Shimizu
在辫状河的形成过程中，涌出的中槽沙坝的发育是非常重要的。数值模型是预报辫状河水流和河床地貌的有力工具之一，但对沙洲边界的水流泥沙运动进行数值模拟难度很大。本文对沙坝出露条件下的数值模型进行了试验，其中试验了一种考虑沙坝出露的技术。计算结果与辫状流形成的实验结果吻合较好。利用计算结果讨论了辫状流的形成和杆模的转变。
Development of emerged mid-channel bar is very important in the formation of braided stream. Numerical model is one of the powerful tools to predict the flow and bed topography in braided streams, however, it is very difficult to simulate the flow and sediment transport at the boundary of emerged bars. In this paper, a numerical model is tested under the condition of emerged bars are developed, in which a technique is tested to take into account for the emerged bars. The calculated results are favorably compared with experiments of the formation of braided streams. The formation of braided stream and transformation of bar mode is discussed using the results of the calculation.