Abstract
Flume experiments are conducted to evaluate the change in channel slope at a stream confluence. The rate of change in the slope of the main channel at the confluence is only weakly related to the discharge ratio of two tributaries, but exhibits a strong positive relationship with the sediment concentration ratio of the confluent flows. This finding indicates that the slope adjusts basically to sediment transport through bed shear stress and the sediment content of the incoming flows plays a primary role in slope change at a stream confluence.
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