NUMERICAL CALCULATION OF BED DEFORMATION IN BRAIDED STREAM
NUMERICAL CALCULATION OF BED DEFORMATION IN BRAIDED STREAM
复制标题
辫状流床层变形的数值计算
DOI：
10.2208/prohe.45.739
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Fujita
中科院分区：
文献类型：
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作者：
Y. Shimizu;H. Kurabayashi;M. Fujita
对两种数值模型进行了试验研究，预测了辫状坝水流和河床变形。第一个模型是经典的二维准定常流模型，采用迎风差分格式。第二个模型为CIP格式的二维非定常流模型。模型计算结果与动床试验结果进行了比较。在特宽河槽中对模型进行了检验，预测了多低沙坝或辫状床的发育情况。在这种情况下，只有第二个模型与CIP计划表现出良好的性能。结果表明，第二种模型可以作为冲积河流分汊河形成预测的有力工具。
Two types of numerical models are tested to predict flow and bed deformation of braided bar channel. The first model is the classical 2-dimensional quasi-steady flow model with upwind differential numerical scheme. The second model is 2-dimensional unsteady flow model with CIP numerical scheme. The results of the models are favorably compared with the moveable bed experiments. The models are tested in the very wide channel to predict the development of multi-low bar or braided bed configuration. In this case, only the second model with CIP scheme show good performance. It is found that the second model can be a powerful tool to predict the formation of braided stream in alluvial rivers.