EFFECT OF THE AMOUNT OF SEDIMENT SUPPLY ON THE UPSTREAM PROGRESS OF WATERFALLS

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  • 滝の上流進行プロセスに及ぼす給砂量の影響

Abstract

<p> We performed flume experiments to study the effect of the amount of sediment supply on the migration process of a knickpoint formed on bedrock. We supplied sediment in a flume with a modeled bedrock with an initial drop, and observed the migration process of the drop. We find that, if the initial drop is sufficiently large, the migration process of a waterfall is of an overhanging type when the sand supply is large, but of a vertical erosion-dominated type when the sand supply is small. Under the experimental conditions of this study, there is a threshold that separates the migration process at a sediment supply rate between 25-35 g/min.</p>

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