Abstract
Headcut erosion has been a major concern recently, as it causes the gully erosion and the formation of incised channels. Flume experiments have been conducted to investigate the headcut erosion process in homogeneous soil. The effects of hydraulic and geometric condition on its migration speed in coarse and find sand have been analyzed. Color spray applied on the top surface resists the surface erosion as well as ensures the headcut development. The experimental result shows the plunge pool morphology remained unchanged with time for a given flow discharge. The migration speed depends on downstream bed slope and obviously on overland flow discharge. Downstream sediment transport capacity controls the migration speed. A conceptual model is introduced to explain details of the headcut migration process. The result of conceptual model reasonably agrees with the experimental data.
