侵食性河床上におけるステップの発生に関する実験 Experiments of the step formation on purely erosional beds
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Steep channels with purely erosional beds are characterized by a series of steps formed on beds. In this paper, experiments were performed in order to study the formation and the evolution of the steps. In the experiments, the wavelength of steps were found to be of the order of ten to sixty times the initial flow depth before the formation of steps. It was observed that the wavelengths reduced over time. In order to investigate the inception of steps, a linear stability analysis is performed with the use of the spectral method with the Chebyshev polynomial. The experimental results were compared with the theoretical results derived from a linear stability analysis. The agreement between theory and experiments were found to be good.
- PROCEEDINGS OF HYDRAULIC ENGINEERING
PROCEEDINGS OF HYDRAULIC ENGINEERING 48, 967-972, 2004
Japan Society of Civil Engineers