Spatio-temporal variations on alluvial fan channel width in response to grain size on the channel bed under constant upstream boundary conditions.

In the runs, the total flow width decreases over time with the rate of decrease gradually slowing, whereas the runs exhibit an increasing trend in total flow width, though the rate of increase also gradually diminishes.

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The highlights of main findings are summarized below: Total channel widths on an alluvial fan exhibit a decreasing trend over time for lower water discharge runs, and an increasing trend for higher water discharge runs as the fan evolves, even under constant upstream boundary conditions.

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