EQUILIBRIUM HEIGHT OF ALTERNATE BARS BASED ON NON-LINEAR RELATIONSHIPS AMONG BED PROFILE, FLOW AND SEDIMENT DISCHARGE
EQUILIBRIUM HEIGHT OF ALTERNATE BARS BASED ON NON-LINEAR RELATIONSHIPS AMONG BED PROFILE, FLOW AND SEDIMENT DISCHARGE
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基于床层剖面、流量和排沙量非线性关系的交替柱平衡高度
DOI：
10.2208/jscej.1985.357_45
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
Masashige Yamasaka
中科院分区：
文献类型：
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作者：
S. Fukuoka;Masashige Yamasaka
交替的斜坝引起水流阻力的增加，并在其上诱导曲流流形成岸滩攻击点。因此，研究导致平衡坝高的动态过程并预测交替坝上的水流是一个重要的课题。线性稳定性分析为交错条带的产生条件和演化过程提供了物理和数学解释，但由于条带高度随时间增加，无法确定平衡条带高度。通过考虑河床剖面与输沙量之间的非线性关系，将其分为流速与河床剖面的非线性关系和输沙量与水流速度的非线性关系，从而实现了平衡高度的估算和交替沙洲的稳定机理。理论条形高度与观测到的平衡条形高度吻合得很好。
Alternate diagonal bars cause the increase in flow resistance and induced meandering flow over them forms a point of bank attack. It is, therefore, important subjects to investigate dynamic process leading to equilibrium bar height and to predict flow over alternate bars. The linear stability analysis provides a physical and mathematical explanation for occurrence conditions and evolutional process of alternate bar, but equilibrium bar height is not able to be determined because the bar increases in height with time. The present work made possible to estimate equilibrium height together with stabilization mechanism of alternate bars by considering non-linear relationship between bed profile and sediment discharge, which was divided into two non-linear relations of stream velocity versus bed profile and of sediment discharge versus stream velocity. Theoretical bar height coinsides fairly well with observed equilibrium bar height.