5:15 PM - 6:30 PM
[HGM01-P02] Response to the uplift of a single channel in mountain rivers: Laboratory experiments
Keywords:downward erosion, lateral erosion, profile
Experiments were performed two times under almost the same condition (Experiments A & B). The uplifts were realized by removing weirs of 1cm at the downstream end. Experiment A was carried out for 300 minutes, during which the uplifts were generated when the river bed seemed stable. Meanwhile, Experiment B was continued for 260 minutes, in which the uplifts were actualized at the same timings as Experiment A regardless of the channel state.
The results, with few exceptions, showed that the elevation of the channel bed at any places continued to lower by downward erosion until a knick-point passed through, and thereafter lateral erosion occurred while downward erosion almost ceased.