| To elucidate alternate bar profiles and bar formation under the non-uniform sediments condition, flume experiments and linear stability analyses were conducted. The experiments results show that alternate bars profiles were disturbed in the case that discharge was reduced by 30% from the case that alternate bar were formed. Those bar profiles disturbance assumed to be caused by forming fix bars covered by coarse sediments. The experiments results also show that bar formation was not formed in some cases. Linear stability analyses results show that prominent instability at 1m bar wave length, that is one third of proper alternate bar wave length, was conformed in one of the case that alternate bar was not formed. Thereby, it was assumed that the peculiar instability restrained bar formation. |
