Formation of Alternate Bars

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Abstract
River channelization works have often resulted in alternate bar formation at low flows. A criterion for alternate bar formation in straight alluvialbed channels with rigid banks is developed following a rational approach, and is substantiated with experimental data. The formation of alternate bars is attributed to meandering development within the confined channel. Such development becomes possible if the streamflow's stable width, or regime width, is less than the confinement width. The stable width is analytically established as a direct function of water discharge. If, at a high flow, the stable width is greater than the confinement width, then alternate bars are absent due to the lack of freedom for meandering development.

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