平坦床-反砂堆遷移の亜臨界分岐に関する実験的研究(移動境界・移動床,一般講演)

概要

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It is suggested by the weakly nonlinear stability analysis that the bifurcation pattern of the flat bed and antidune transition correlates to the stability of upstream-migrating antidunes. In this study, we performed a series of flume experiments to observe the behavior of upstream-migrating antidunes and obtained parameters which characterize the bifurcation patterns. As a result, the strong instability of antidunes was observed when the velocity coefficient exceeds 16, which can be correlated to the subcritical bifurcation. When the velocity coefficient is small, such as around 11, antidunes are stable, showing that it is under the condition of the supercritical bifurcation. These experimental results show that the stability of the upstream-migrating antidunes changes associated with the velocity coefficient.
日本流体力学会の論文
2010-09-09