The external dynamic conditions,such as reservoir capacity and inflow rate,significantly impact the overtopping breach process of the landslide dam.This paper systematically investigates changes in erosion characteristics at different stages of the overtopping breach process under various reservoir capacities and inflow rates through flume experiments,with the aim of revealing the response mechanisms of breach duration and peak discharge to external dynamic conditions.The research results indicate that reservoir capacity and inflow rate significantly influence backward erosion efficiency by controlling the rate of water level change during the initial breaching stage of the landslide dam,which affects breach duration.Reservoir capacity and inflow rate affect the peak discharge by controlling the lateral erosion rate of the breach,thus influencing the lateral widening efficiency during the accelerated erosion stage.There is an inconsistent response between vertical and lateral erosion to changes in external dynamic conditions during the accelerated erosion stage,with vertical erosion being significantly more suppressed.These findings contribute to a deeper understanding of the overtopping breach mechanism of landslide dams and provide valuable insights for flood control and disaster mitigation efforts.
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