摘要：Headcut erosion can severely accelerate soil loss in upland concentrated flows and lead to significant soil degradationin agricultural areas. Previous experimental work has demonstrated that actively migrating headcuts display systematicmorphodynamic behavior, and impinging jet theory can provide an excellent theoretical foundation for this erosionalphenomenon. This research sought to examine systematically the effect of an upstream sediment inflow on themorphodynamics of actively migrating headcuts in upland concentrated flows. Using a specially designed experimental facility,actively migrating headcuts were allowed to develop, and then subjected to an upstream sediment load composed ofsand. As the upstream sediment feed rate increased, the size and migration rate of the headcut decreased markedly, but sedimentdischarge was less affected. The headcut erosion process was arrested as sediment inflow rates increased above athreshold value. As sediment feed rate upstream of the headcut increased, sediment size fraction downstream of the headcutalso increased. This research suggests that headcut erosion can be greatly modulated by an upstream sediment source, furthercomplicating the prediction of soil erosion on upland areas.
