Development and transformation process of alternate bars and variations in flow depth and sediment transport rate due to periodic change of water discharge are investigated on the basis of flume tests using the uniform and the graded sediment. Experimental results show that an effect of the change rate of discharge on the development and transformation is large in case of the short wave period , whereas it is relatively small in case of the long wave period. The wave height of an individual alternate bar in the graded sediment bed is lower than that in the uniform one during the flood period. This reason is that the erosion of bed in its pool is restrained by sediment coarsening caused by grain sorting . Response-lags of the wavelength and height, flow depth and sediment transport rate to discharge change are small when the wave period is long, whereas they are large when the wave period is short. Response-lag of alternate bars to discharge change in the graded sediment bed is smaller than that in the uniform one .
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