A232 侵食性河床における河床リップルの形成機構(A-23 河川における移動床流れ(3),一般講演)

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  • A232 Formation of ripple-like morphology on purely erosional beds

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In the erosion process of beds composed of cohesive clay, small waves are observed to be formed on the bed surface. In this study, a liner stability analysis of the formation of ripples on noncohesive beds is applied to the formation of small waves on purely erosional beds. The analysis reveals that flat beds become unstable, resulting in the growth of sinusoidal perturbations when the wavenumber is somewhere between 0.001 and 0.07. The characteristic wavelength is of 5-10 times the reciprocal of the shear velocity. The agreement between results of the analysis as well as an experiment are found to be reasonably good.

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