Effects of rotational degradation/aggradation of riverbed caused by an imbalance between water and sediment discharge conditions on variation in alternate bar morphology are investigated by means of flume tests using uniform and non-uniform sediment. Results are summarized as follows: (1) The riverbed degradation under the condition near to the double-row bar range causes the low-watercourse formation, and that under the condition near to the no bar range causes the restriction of alternate bar development. In addition, the aggradation under the condition near to the no bar range causes the increase of the alternate bar wavelength. (2) The increase and the decrease of wavelength of alternate bars in consequence of the riverbed degradation are remarkable in the non-uniform sediment bed. (3) Not only a bed slope but also its changing rate affects variations in bar morphology.
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